Preparation of steel substrates before application of paints and related products--Surface preparation methods--General principles
Some standard content:
ICS 25. 220. 10
National Standard of the People's Republic of China
GB/T18839.1---2002
eqv ISO 8504-1:2000
Surface treatment of steel substrates before application of paints
Surface treatment methods
Preparation of steel substrates before application of paintsand related products-Surface preparation methods --General principles
Issued on September 13, 2002
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on March 1, 2003
GB/T 18839. 1--2002
This standard is compiled based on JSC) 850412000Surface treatment methods of steel substrates before application of paints.
is equivalent to the international standard in terms of technical content. This standard, except for the introduction of TS 8504-1, does not specify the general principles for selecting surface treatment methods. It should be used together with GB/T18839-2-2002 Surface treatment of steel materials before coating (abrasive blasting) (CAJS 8501-2: 200C) or surface treatment methods (GB/T1883.3-2002 & Surface treatment of steel materials before coating - Manual and power cleaning (CAJS 8504-3: 1993) which specifies specific surface treatment methods. This standard was proposed by China Shipbuilding Industry Corporation. This standard is under the jurisdiction of the 11th Research Institute of China Shipbuilding Industry. The drafting unit of this standard: China Shipbuilding Industry 1st Research Institute. The main authors of this standard: Bo Jianhua, An Yinhua. GB/T18839-1—2002
ISO Foreword
The International Organization for Standardization (TSO) is a global federation of national standards bodies (ISO member bodies). The work of formulating international standards is carried out by the technical committees of TSO. Each member body that is interested in the subject of a technical committee has the right to participate in the technical committee. Governmental and non-governmental international organizations in contact with ISO may also participate in this work. ISO works closely with the International Electrotechnical Commission (IEC) in all aspects of the standardization of electrical technology. The draft international standards adopted by the technical committees shall be sent to the Executive or Members' Group for voting before being approved as international standards by the ISO Council. According to the ISO standard-setting procedures, international standards shall be voted by at least 75% of the Members' Group before they can become international standards. International standards shall be prepared in accordance with the provisions of Part 3 of the ISO(O)/IE Directives. Some of the contents of this part may involve patent rights. IS(I) shall not be held responsible for proving any or all such patent rights. This International Standard IS(I) 8504-1:2000 was prepared by IS(I)/TC35/SC:12 Technical Committee on Paints and Varnishes, Subcommittee on Surface Preparation of Materials Before Application of Coatings.
This version of standard is a revision and editorial proofreading of the previous version (ISO8504-1:1992), canceling and replacing the previous version.
IS08534 is composed of the following parts under the general title "Surface preparation of steel materials before application of paints and related groduets-Surface preparation methods": Part 1: General principles
Part 2: Blasting cleaning
Part 3: Cleaning with power tools
Some other parts are under preparation.
1 Scope
National Standard of the People's Republic of China
Surface preparation of steel materials before application of paints and related groduets-Surface preparation methodsGeneral principles
G13/T 18839. 1-2002
eq [S0 8504-1:2000
This standard specifies the general principles for selecting surface treatment methods for steel materials to be coated with paint, and also specifies the key factors to be considered before selecting and determining the surface treatment method and treatment level. This standard is applicable to the selection and determination of surface treatment methods for steel materials before coating. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through integration in this standard. This standard is published and the versions shown are valid. All standards will be revised and used. For non-standard items, the possibility of using the latest version of the following standards should be explored. GB/T 8923-1988 Rust grade of steel surface before painting Rust removal grade (m150) 85011:1988 GH/118570.2-2001 Surface preparation of steel before coating Surface cleanliness assessment test Determination of oxidants on cleaned surface (c150 8502-2:1912 Surface preparation of steel before coating Surface cleanliness assessment test Determination of oxidants on cleaned surface (c150 8502-2:19121 Surface preparation of steel before coating Surface cleanliness assessment test Determination of oxidants on cleaned surface GB/T 18570.4—2001
Guide for the assessment of performance properties (EUVIS()8502.4:1993) OR/T 18839.2—2602
Surface preparation of materials before coating - Methods of surface preparation - Abrasive blasting cleaning (EUVIS()8501-2:2000)
JS() 4628 2:1982
Determination of film ageing of paints and varnishes
Part 2: Specification of blistering grades
Determination of the degree, number and size of common types of defects Part 1ISO 4628 3:1982
Determination of film ageing of paints and varnishes
Determination of the degree, number and size of common types of defects Part 3: Specification of rust grades 4628-4:1982
Determination of ageing of paint and varnish films
Determination of the extent, number and size of certain types of defects Part 4: Determination of cracking grades
Determination of ageing of paint and varnish films Determination of the extent, number and size of certain types of defects Part 150 ISO 8501-2:1904 Visual assessment of the cleanliness of steel surfaces before application of paint - Part 2: Determination of the degree of rust removal on previously coated steel surfaces Supplement: Typical sample photographs of color changes on steel surfaces treated with non-abrasive blasting Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on September 13, 2002, for implementation on March 1, 2003 GB/T 18839. 1- 2002 Visual assessment of the cleanliness of steel surfaces before application of paint - Part 1: Determination of the degree of rust removal on previously coated steel surfaces Supplement: Typical sample photographs of color changes on steel surfaces treated with non-abrasive blasting 8501-3,
Determination of the activity of steel surfaces before coating - Part 3: Determination of the degree of cleanliness of steel surfaces treated with paint - Part 3: Determination of the degree of cleanliness of steel surfaces, cut edges and other defective surfaces
[S()TR8502-1:1901Tests for the assessment of the cleanliness of steel surfaces before coating - Part 1: Field tests for the determination of the properties of rust and rust products
Tests for the assessment of the cleanliness of steel surfaces before coating - Part 1: Dust assessment (sensitive belt method)
JS) 850 2-9:1993 Surface preparation of materials before coating - Tests for the assessment of surface cleanliness - Part 9: Method for the on-site determination of conductivity of water-soluble fluorinated surfaces - Tests for the assessment of surface cleanliness - Part 10: Titration method for the on-site determination of water-soluble fluorinated surfaces on steel substrates - ISO 8503-1:1988 Surface roughness characteristics of steel substrates after blast cleaning before coating - Part 1: Test requirements for the assessment of surface roughness of surfaces after abrasive blast cleaning - ISO 8503 B505-411988 IS0 8505.3:1988 Surface roughness characteristics of steel substrates after blast cleaning - Part 1: Test specimens for the assessment of surface roughness of surfaces after abrasive blast cleaning - ISO 8503-411988
Xu Cheng Comprehensive Materials Surface treatment of cast materials - Determination of the surface roughness of steel surfaces after blast cleaning - Part 2: Comparative method for the assessment of the surface roughness grade of steel surfaces after abrasive blast cleaning - Part 3: Verification of specimens and method for the determination of surface roughness by focusing microscope Surface treatment of steel before coating - Determination of surface roughness of blast cleaned materials - Part 4: Verification of reference specimens and method for the determination of surface roughness - Energy saving method 150) 1291+-4:1998 Corrosion protection of steel structures with anti-corrosion coatings and other paints - Part 1: Classification and types of surface treatments
3 Overview
The main purpose of surface treatment is to remove harmful substances from the material surface and to provide good adhesion of the primer. The surface treatment helps to reduce the content of pollutants that cause corrosion. The surface conditions of steel materials to be treated before installation are varied, especially the painted structures to be repaired: the use limit of the structure, its location, the quality of the original surface, the performance and degree of the existing coating system, the type and severity of the original and future corrosion environment, and the proposed new layer system, etc., which may affect the surface treatment required, the surface treatment problems and methods should be considered. If necessary, the surface treatment degree that is compatible with the proposed dye matching system should also be considered. The cost of surface treatment is proportional to the degree of cleanliness, so it is necessary to select a treatment level that is compatible with the requirements of the coating matching system, or a coating matching system that is suitable for the treatment level that can be achieved. Personnel carrying out surface treatment operations should have appropriate equipment and the necessary process technical knowledge so that they can operate in accordance with specification requirements. All relevant health and safety regulations should be strictly observed. The most important thing is that the treated surface is easily accessible and fully illuminated. All processes should be carried out in a manner that ensures the tightness of the production process. If the specified treatment level cannot be achieved with the selected surface treatment method, or if the condition of the treated surface has changed significantly before the material matching system is used, the relevant steps should be repeated to achieve the desired treatment level. Before surface treatment, the joint manufacturing door should pre-treat the welding chain to remove welding spatter, burrs and other sharp edges. For specific provisions, see 150 8501 3
A Condition of the surface to be treated
4-1 Evaluation of the condition of the surface to be treated
Special publication
GB/T 18839. 1—2002
The cost of surface treatment is greatly affected by the condition of the surface to be treated. Therefore, before determining the surface treatment method and treatment level of the head body, the information listed in the following a) or b) should be understood, and the rust level determined by CB/T8923 should be evaluated according to the appropriate typical sample photos in GT3/T8423 or IS08501-2. ) Uncoated surfaces
- Type of steel (including any special treatments that may affect handling of the coating) and thickness of the steel; - Worst rust level assessed in accordance with GB/T 8923 and any relevant additional details (e.g. rust level D for thick rust layers); additional details on chemical and/or other contaminants (e.g. water-soluble salts that promote corrosion); h) Painted surfaces
- Type of coating or coating system (e.g. type of base and pigment), approximate film quality, condition and age; - Rust level assessed in accordance with TS04628-3 and additional details on apparent unfinished rust: "Blistering level assessed in accordance with TS04628-2": Cracking level assessed in accordance with ISO4628-4:
Peeling level assessed in accordance with ISO4628-5 ：
--Supplementary details on stress, chemical and/or other contaminants. 4.2 Influence of on-site environmental conditions
In order to reduce the cost of surface preparation, it is necessary to avoid storing unprotected steel in industrial or marine environments, as the removal of materials that accelerate corrosion may cause serious contamination. The treatment should be carried out as far as possible when the rust grade is A or B as defined in GB/T 8923 (C for manual treatment), and a suitable primer should be applied as soon as possible. Under weather conditions such as rain and snow, surface treatment operations should not be carried out outdoors using spray cleaning (see GB/T18839.2-2002) or other surface treatment methods. In order to minimize the possibility of condensation, the temperature of the surface to be treated should be higher than the dew point of the ambient air and at least 3 degrees higher than the temperature of the instrument. If the above operations are carried out If the work must be carried out continuously under adverse weather conditions, special precautions must be taken, such as heating the surface or air drying it when working indoors (see GB/T18570.4-2001). Special precautions should be taken when performing surface treatment work in flammable and explosive areas, such as preventing sparks, electrical discharges, and open flames.
4.3 Removal of pollutants
Oil, fats, dust and similar pollutants should be removed by appropriate methods before surface treatment. In addition, thick and firmly adhered rust and oxidation should be removed in advance by appropriate manual or machine methods. If specified or agreed upon, other methods should be used to remove water-soluble pollutants such as salts before or after the selected surface treatment method is used. www.bzxz.net
Applicable methods for removing pollutants can be found in ISO1 29444.5 Selection of surface treatment methods The selection of surface treatment methods should consider the following four aspects: The condition of the surface to be treated (see Chapter 4 of IS08502 and [IS08503]); The feasibility of the proposed method, such as whether the operating conditions, health, safety and environmental conditions meet the requirements, whether the surface treatment work can be completed within the scheduled period, etc.; The scope of surface treatment, whether the entire surface or a part of the surface to be treated; The required surface treatment level; The coating matching system to be used; Economic efficiency; Specific requirements for the operating conditions of the surface treatment process or the required surface treatment results (such as surface roughness or removal of water-soluble pollutants); Selection of surface treatment level GB/T 18839. 1—2002
The selection of surface treatment grade takes into account the following factors: - Description of the surface to be treated (see Chapter 4, IS) 8502 and ISO 8503); - Material matching system to be used; - Corrosiveness of the environment in which the surface after coating will be located; - Surface treatment area (all or part of the surface to be treated); - Feasibility of the surface treatment method used to achieve a certain surface treatment grade; - Economic efficiency.
The assessment of the cleanliness of the surface after treatment usually adopts the surface treatment grades specified in GB/T8923 and IS085012. When the parties concerned reach a consensus, other surface treatment grades may also be used. Other surface treatment grades can be defined by reference samples to be determined or by local reference surfaces of the object to be treated. If the latter is adopted, these references should be protected to prevent discoloration or preserved by photographing.
Only when the following requirements are met, the surface treatment grade with the highest surface cleanliness is specified, such as Sa3 defined in GB/8923.
a) Surface condition (such as the presence of a large number of corrosive pollutants on the surface), the requirements of the coating system to be used and/or the corrosive environment of the surface after coating;
h) The conditions that can be met to achieve and maintain this treatment grade (such as dry and clean air). The highest cleaning level is also appropriate when it can extend the maintenance interval and thus reduce maintenance costs (such as scaffolding and downtime).
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors:
1-Steel type:
Surface preparation method, including tools or materials used (such as abrasives for blast cleaning). In: TS(8u01-1 Supplement No. 1, dye sample photos of steel color changes after dry blast cleaning to Sa3 level with different metals and non-metals are provided. After surface treatment, the treated surface shall be evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the external allowable cleanliness of the surface shall be evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO85021 and TS8503-2.1998 Corrosion protection of steel structures with paint and coating systems for corrosion protection Part 1: Types of surface treatments
3 Overview
The main purpose of surface treatment is to remove harmful substances from the surface of the material and to ensure good adhesion of the primer. Surface treatment helps to reduce the amount of pollutants that cause corrosion. The surface conditions of steel materials to be treated before installation are varied, especially for painted structures to be repaired: the use limit of the structure, the location of the original surface, the performance and degree of the existing coating system, the type and severity of the original and future corrosion environment, and the proposed new coating system. When considering the required surface treatment, the required treatment level should be considered. If necessary, the surface degree suitable for the proposed dye matching system should also be considered. The cost of surface treatment is proportional to the degree of cleanliness, so it is important to select a treatment level that is compatible with the requirements of the coating system, or a coating system that is compatible with the treatment level that can be achieved. Personnel performing surface treatment operations should have appropriate equipment and the necessary process and technical knowledge to be able to operate in accordance with the specifications, and should comply with all relevant health and safety regulations. It is important that the treated surface is easily accessible and fully illuminated, and that all processes are carried out in a manner that is consistent with the intended treatment level. If the specified treatment level cannot be achieved with the selected surface treatment method, or if the condition of the treated surface has changed significantly before the coating system is used, the relevant steps should be repeated to achieve the desired treatment level. Before surface treatment, the joint manufacturing door should pre-treat the welding chain to remove welding spatter, burrs and other sharp edges. For specific provisions, see 150 8501 3
A Condition of the surface to be treated
4-1 Evaluation of the condition of the surface to be treated
Special publication
GB/T 18839. 1—2002
The cost of surface treatment is greatly affected by the condition of the surface to be treated. Therefore, before determining the surface treatment method and treatment level of the head body, the information listed in the following a) or b) should be understood, and the rust level determined by CB/T8923 should be evaluated according to the appropriate typical sample photos in GT3/T8423 or IS08501-2. ) Uncoated surfaces
- Type of steel (including any special treatments that may affect handling of the coating) and thickness of the steel; - Worst rust level assessed in accordance with GB/T 8923 and any relevant additional details (e.g. rust level D for thick rust layers); additional details on chemical and/or other contaminants (e.g. water-soluble salts that promote corrosion); h) Painted surfaces
- Type of coating or coating system (e.g. type of base and pigment), approximate film quality, condition and age; - Rust level assessed in accordance with TS04628-3 and additional details on apparent unfinished rust: "Blistering level assessed in accordance with TS04628-2": Cracking level assessed in accordance with ISO4628-4:
Peeling level assessed in accordance with ISO4628-5 ：
--Supplementary details on stress, chemical and/or other contaminants. 4.2 Influence of on-site environmental conditions
In order to reduce the cost of surface preparation, it is necessary to avoid storing unprotected steel in industrial or marine environments, as the removal of materials that accelerate corrosion may cause serious contamination. The treatment should be carried out as far as possible when the rust grade is A or B as defined in GB/T 8923 (C for manual treatment), and a suitable primer should be applied as soon as possible. Under weather conditions such as rain and snow, surface treatment operations should not be carried out outdoors using spray cleaning (see GB/T18839.2-2002) or other surface treatment methods. In order to minimize the possibility of condensation, the temperature of the surface to be treated should be higher than the dew point of the ambient air and at least 3 degrees higher than the temperature of the instrument. If the above operations are carried out If the work must be carried out continuously under adverse weather conditions, special precautions must be taken, such as heating the surface or air drying it when working indoors (see GB/T18570.4-2001). Special precautions should be taken when performing surface treatment work in flammable and explosive areas, such as preventing sparks, electrical discharges, and open flames.
4.3 Removal of pollutants
Oil, fats, dust and similar pollutants should be removed by appropriate methods before surface treatment. In addition, thick and firmly adhered rust and oxidation should be removed in advance by appropriate manual or machine methods. If specified or agreed upon, other methods should be used to remove water-soluble pollutants such as salts before or after the selected surface treatment method is used.
Applicable methods for removing pollutants can be found in ISO1 29444.5 Selection of surface treatment methods The selection of surface treatment methods should consider the following four aspects: The condition of the surface to be treated (see Chapter 4 of IS08502 and [IS08503]); The feasibility of the proposed method, such as whether the operating conditions, health, safety and environmental conditions meet the requirements, whether the surface treatment work can be completed within the scheduled period, etc.; The scope of surface treatment, whether the entire surface or a part of the surface to be treated; The required surface treatment level; The coating matching system to be used; Economic efficiency; Specific requirements for the operating conditions of the surface treatment process or the required surface treatment results (such as surface roughness or removal of water-soluble pollutants); Selection of surface treatment level GB/T 18839. 1—2002
The selection of surface treatment grade takes into account the following factors: - Description of the surface to be treated (see Chapter 4, IS) 8502 and ISO 8503); - Material matching system to be used; - Corrosiveness of the environment in which the surface after coating will be located; - Surface treatment area (all or part of the surface to be treated); - Feasibility of the surface treatment method used to achieve a certain surface treatment grade; - Economic efficiency.
The assessment of the cleanliness of the surface after treatment usually adopts the surface treatment grades specified in GB/T8923 and IS085012. When the parties concerned reach a consensus, other surface treatment grades may also be used. Other surface treatment grades can be defined by reference samples to be determined or by local reference surfaces of the object to be treated. If the latter is adopted, these references should be protected to prevent discoloration or preserved by photographing.
Only when the following requirements are met, the surface treatment grade with the highest surface cleanliness is specified, such as Sa3 defined in GB/8923.
a) Surface condition (such as the presence of a large number of corrosive pollutants on the surface), the requirements of the coating system to be used and/or the corrosive environment of the surface after coating;
h) The conditions that can be met to achieve and maintain this treatment grade (such as dry and clean air). The highest cleaning level is also appropriate when it can extend the maintenance interval and thus reduce maintenance costs (such as scaffolding and downtime).
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors:
1-Steel type:
Surface preparation method, including tools or materials used (such as abrasives for blast cleaning). In: TS(8u01-1 Supplement No. 1, dye sample photos of steel color changes after dry blast cleaning to Sa3 level with different metals and non-metals are provided. After surface treatment, the treated surface shall be evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the external allowable cleanliness of the surface shall be evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO85021 and TS8503-2.1998 Corrosion protection of steel structures with paint and coating systems for corrosion protection Part 1: Types of surface treatments
3 Overview
The main purpose of surface treatment is to remove harmful substances from the surface of the material and to ensure good adhesion of the primer. Surface treatment helps to reduce the amount of pollutants that cause corrosion. The surface conditions of steel materials to be treated before installation are varied, especially for painted structures to be repaired: the use limit of the structure, its location, the quality of the original surface, the performance and resistance of the existing coating system, the type and severity of the original and future corrosion environment, and the proposed new coating system. When considering the required surface treatment, the required treatment level should be considered. If necessary, the surface resistance that is compatible with the proposed dye system should also be considered. The cost of surface treatment is proportional to the degree of cleanliness, so it is important to select a treatment level that is compatible with the requirements of the coating system, or a coating system that is compatible with the treatment level that can be achieved. Personnel performing surface treatment operations should have appropriate equipment and the necessary process and technical knowledge to be able to operate in accordance with the specifications, and should comply with all relevant health and safety regulations. It is important that the treated surface is easily accessible and fully illuminated, and that all processes are carried out in a manner that is consistent with the intended treatment level. If the specified treatment level cannot be achieved with the selected surface treatment method, or if the condition of the treated surface has changed significantly before the coating system is used, the relevant steps should be repeated to achieve the desired treatment level. Before surface treatment, the joint manufacturing door should pre-treat the welding chain to remove welding spatter, burrs and other sharp edges. For specific provisions, see 150 8501 3
A Condition of the surface to be treated
4-1 Evaluation of the condition of the surface to be treated
Special publication
GB/T 18839. 1—2002
The cost of surface treatment is greatly affected by the condition of the surface to be treated. Therefore, before determining the surface treatment method and treatment level of the head body, the information listed in the following a) or b) should be understood, and the rust level determined by CB/T8923 should be evaluated according to the appropriate typical sample photos in GT3/T8423 or IS08501-2. ) Uncoated surfaces
- Type of steel (including any special treatments that may affect handling of the coating) and thickness of the steel; - Worst rust level assessed in accordance with GB/T 8923 and any relevant additional details (e.g. rust level D for thick rust layers); additional details on chemical and/or other contaminants (e.g. water-soluble salts that promote corrosion); h) Painted surfaces
- Type of coating or coating system (e.g. type of base and pigment), approximate film quality, condition and age; - Rust level assessed in accordance with TS04628-3 and additional details on apparent unfinished rust: "Blistering level assessed in accordance with TS04628-2": Cracking level assessed in accordance with ISO4628-4:
Peeling level assessed in accordance with ISO4628-5 ：
--Supplementary details on stress, chemical and/or other contaminants. 4.2 Influence of on-site environmental conditions
In order to reduce the cost of surface preparation, it is necessary to avoid storing unprotected steel in industrial or marine environments, as the removal of materials that accelerate corrosion may cause serious contamination. The treatment should be carried out as far as possible when the rust grade is A or B as defined in GB/T 8923 (C for manual treatment), and a suitable primer should be applied as soon as possible. Under weather conditions such as rain and snow, surface treatment operations should not be carried out outdoors using spray cleaning (see GB/T18839.2-2002) or other surface treatment methods. In order to minimize the possibility of condensation, the temperature of the surface to be treated should be higher than the dew point of the ambient air and at least 3 degrees higher than the temperature of the instrument. If the above operations are carried out If the work must be carried out continuously under adverse weather conditions, special precautions must be taken, such as heating the surface or air drying it when working indoors (see GB/T18570.4-2001). Special precautions should be taken when performing surface treatment work in flammable and explosive areas, such as preventing sparks, electrical discharges, and open flames.
4.3 Removal of pollutants
Oil, fats, dust and similar pollutants should be removed by appropriate methods before surface treatment. In addition, thick and firmly adhered rust and oxidation should be removed in advance by appropriate manual or machine methods. If specified or agreed upon, other methods should be used to remove water-soluble pollutants such as salts before or after the selected surface treatment method is used.
Applicable methods for removing pollutants can be found in ISO1 29444.5 Selection of surface treatment methods The selection of surface treatment methods should consider the following four aspects: The condition of the surface to be treated (see Chapter 4 of IS08502 and [IS08503]); The feasibility of the proposed method, such as whether the operating conditions, health, safety and environmental conditions meet the requirements, whether the surface treatment work can be completed within the scheduled period, etc.; The scope of surface treatment, whether the entire surface or a part of the surface to be treated; The required surface treatment level; The coating matching system to be used; Economic efficiency; Specific requirements for the operating conditions of the surface treatment process or the required surface treatment results (such as surface roughness or removal of water-soluble pollutants); Selection of surface treatment level GB/T 18839. 1—2002
The selection of surface treatment grade takes into account the following factors: - Description of the surface to be treated (see Chapter 4, IS) 8502 and ISO 8503); - Material matching system to be used; - Corrosiveness of the environment in which the surface after coating will be located; - Surface treatment area (all or part of the surface to be treated); - Feasibility of the surface treatment method used to achieve a certain surface treatment grade; - Economic efficiency.
The assessment of the cleanliness of the surface after treatment usually adopts the surface treatment grades specified in GB/T8923 and IS085012. When the parties concerned reach a consensus, other surface treatment grades may also be used. Other surface treatment grades can be defined by reference samples to be determined or by local reference surfaces of the object to be treated. If the latter is adopted, these references should be protected to prevent discoloration or preserved by photographing.
Only when the following requirements are met, the surface treatment grade with the highest surface cleanliness is specified, such as Sa3 defined in GB/8923.
a) Surface condition (such as the presence of a large number of corrosive pollutants on the surface), the requirements of the coating system to be used and/or the corrosive environment of the surface after coating;
h) The conditions that can be met to achieve and maintain this treatment grade (such as dry and clean air). The highest cleaning level is also appropriate when it can extend the maintenance interval and thus reduce maintenance costs (such as scaffolding and downtime).
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors:
1-Steel type:
Surface preparation method, including tools or materials used (such as abrasives for blast cleaning). In: TS(8u01-1 Supplement No. 1, dye sample photos of steel color changes after dry blast cleaning to Sa3 level with different metals and non-metals are provided. After surface treatment, the treated surface shall be evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the external allowable cleanliness of the surface shall be evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO85021 and TS8503-2.Also consider the degree of surface finish that is compatible with the proposed dye system. The cost of surface preparation is proportional to the degree of cleanliness, so it is important to select a treatment level that is compatible with the coating system requirements, or a coating system that is compatible with the treatment level that can be achieved. Personnel performing surface treatment operations should have appropriate equipment and the necessary process knowledge to be able to operate in accordance with the specification. All relevant health and safety regulations should be followed. It is important that the surface being treated is easily accessible and well illuminated, and that all processes are carried out in a manner that is consistent with the intended performance. If the specified treatment level is not achieved with the selected surface treatment method, or if the condition of the treated surface has changed significantly before the material system is used, the relevant steps should be repeated to achieve the desired treatment level. Before surface treatment, the joint manufacturing door should pre-treat the welding chain to remove welding spatter, burrs and other sharp edges. For specific provisions, see 150 8501 3
A Condition of the surface to be treated
4-1 Evaluation of the condition of the surface to be treated
Special publication
GB/T 18839. 1—2002
The cost of surface treatment is greatly affected by the condition of the surface to be treated. Therefore, before determining the surface treatment method and treatment level of the head body, the information listed in the following a) or b) should be understood, and the rust level determined by CB/T8923 should be evaluated according to the appropriate typical sample photos in GT3/T8423 or IS08501-2. ) Uncoated surfaces
- Type of steel (including any special treatments that may affect handling of the coating) and thickness of the steel; - Worst rust level assessed in accordance with GB/T 8923 and any relevant additional details (e.g. rust level D for thick rust layers); additional details on chemical and/or other contaminants (e.g. water-soluble salts that promote corrosion); h) Painted surfaces
- Type of coating or coating system (e.g. type of base and pigment), approximate film quality, condition and age; - Rust level assessed in accordance with TS04628-3 and additional details on apparent unfinished rust: "Blistering level assessed in accordance with TS04628-2": Cracking level assessed in accordance with ISO4628-4:
Peeling level assessed in accordance with ISO4628-5 ：
--Supplementary details on stress, chemical and/or other contaminants. 4.2 Influence of on-site environmental conditions
In order to reduce the cost of surface preparation, it is necessary to avoid storing unprotected steel in industrial or marine environments, as the removal of materials that accelerate corrosion may cause serious contamination. The treatment should be carried out as far as possible when the rust grade is A or B as defined in GB/T 8923 (C for manual treatment), and a suitable primer should be applied as soon as possible. Under weather conditions such as rain and snow, surface treatment operations should not be carried out outdoors using spray cleaning (see GB/T18839.2-2002) or other surface treatment methods. In order to minimize the possibility of condensation, the temperature of the surface to be treated should be higher than the dew point of the ambient air and at least 3 degrees higher than the temperature of the instrument. If the above operations are carried out If the work must be carried out continuously under adverse weather conditions, special precautions must be taken, such as heating the surface or air drying it when working indoors (see GB/T18570.4-2001). Special precautions should be taken when performing surface treatment work in flammable and explosive areas, such as preventing sparks, electrical discharges, and open flames.
4.3 Removal of pollutants
Oil, fats, dust and similar pollutants should be removed by appropriate methods before surface treatment. In addition, thick and firmly adhered rust and oxidation should be removed in advance by appropriate manual or machine methods. If specified or agreed upon, other methods should be used to remove water-soluble pollutants such as salts before or after the selected surface treatment method is used.
Applicable methods for removing pollutants can be found in ISO1 29444.5 Selection of surface treatment methods The selection of surface treatment methods should consider the following four aspects: The condition of the surface to be treated (see Chapter 4 of IS08502 and [IS08503]); The feasibility of the proposed method, such as whether the operating conditions, health, safety and environmental conditions meet the requirements, whether the surface treatment work can be completed within the scheduled period, etc.; The scope of surface treatment, whether the entire surface or a part of the surface to be treated; The required surface treatment level; The coating matching system to be used; Economic efficiency; Specific requirements for the operating conditions of the surface treatment process or the required surface treatment results (such as surface roughness or removal of water-soluble pollutants); Selection of surface treatment level GB/T 18839. 1—2002
The selection of surface treatment grade takes into account the following factors: - Description of the surface to be treated (see Chapter 4, IS) 8502 and ISO 8503); - Material matching system to be used; - Corrosiveness of the environment in which the surface after coating will be located; - Surface treatment area (all or part of the surface to be treated); - Feasibility of the surface treatment method used to achieve a certain surface treatment grade; - Economic efficiency.
The assessment of the cleanliness of the surface after treatment usually adopts the surface treatment grades specified in GB/T8923 and IS085012. When the parties concerned reach a consensus, other surface treatment grades may also be used. Other surface treatment grades can be defined by reference samples to be determined or by local reference surfaces of the object to be treated. If the latter is adopted, these references should be protected to prevent discoloration or preserved by photographing.
Only when the following requirements are met, the surface treatment grade with the highest surface cleanliness is specified, such as Sa3 defined in GB/8923.
a) Surface condition (such as the presence of a large number of corrosive pollutants on the surface), the requirements of the coating system to be used and/or the corrosive environment of the surface after coating;
h) The conditions that can be met to achieve and maintain this treatment grade (such as dry and clean air). The highest cleaning level is also appropriate when it can extend the maintenance interval and thus reduce maintenance costs (such as scaffolding and downtime).
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors:
1-Steel type:
Surface preparation method, including tools or materials used (such as abrasives for blast cleaning). In: TS(8u01-1 Supplement No. 1, dye sample photos of steel color changes after dry blast cleaning to Sa3 level with different metals and non-metals are provided. After surface treatment, the treated surface shall be evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the external allowable cleanliness of the surface shall be evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO85021 and TS8503-2.Also consider the degree of surface finish that is compatible with the proposed dye system. The cost of surface preparation is proportional to the degree of cleanliness, so it is important to select a treatment level that is compatible with the coating system requirements, or a coating system that is compatible with the treatment level that can be achieved. Personnel performing surface treatment operations should have appropriate equipment and the necessary process knowledge to be able to operate in accordance with the specification. All relevant health and safety regulations should be followed. It is important that the surface being treated is easily accessible and well illuminated, and that all processes are carried out in a manner that is consistent with the intended use. If the specified treatment level is not achieved with the selected surface treatment method, or if the condition of the treated surface has changed significantly before the material system is used, the relevant steps should be repeated to achieve the desired treatment level. Before surface treatment, the joint manufacturing door should pre-treat the welding chain to remove welding spatter, burrs and other sharp edges. For specific provisions, see 150 8501 3
A Condition of the surface to be treated
4-1 Evaluation of the condition of the surface to be treated
Special publication
GB/T 18839. 1—2002
The cost of surface treatment is greatly affected by the condition of the surface to be treated. Therefore, before determining the surface treatment method and treatment level of the head body, the information listed in the following a) or b) should be understood, and the rust level determined by CB/T8923 should be evaluated according to the appropriate typical sample photos in GT3/T8423 or IS08501-2. ) Uncoated surfaces
- Type of steel (including any special treatments that may affect handling of the coating) and thickness of the steel; - Worst rust level assessed in accordance with GB/T 8923 and any relevant additional details (e.g. rust level D for thick rust layers); additional details on chemical and/or other contaminants (e.g. water-soluble salts that promote corrosion); h) Painted surfaces
- Type of coating or coating system (e.g. type of base and pigment), approximate film quality, condition and age; - Rust level assessed in accordance with TS04628-3 and additional details on apparent unfinished rust: "Blistering level assessed in accordance with TS04628-2": Cracking level assessed in accordance with ISO4628-4:
Peeling level assessed in accordance with ISO4628-5 ：
--Supplementary details on stress, chemical and/or other contaminants. 4.2 Influence of on-site environmental conditions
In order to reduce the cost of surface preparation, it is necessary to avoid storing unprotected steel in industrial or marine environments, as the removal of materials that accelerate corrosion may cause serious contamination. The treatment should be carried out as far as possible when the rust grade is A or B as defined in GB/T 8923 (C for manual treatment), and a suitable primer should be applied as soon as possible. Under weather conditions such as rain and snow, surface treatment operations should not be carried out outdoors using spray cleaning (see GB/T18839.2-2002) or other surface treatment methods. In order to minimize the possibility of condensation, the temperature of the surface to be treated should be higher than the dew point of the ambient air and at least 3 degrees higher than the temperature of the instrument. If the above operations are carried out If the work must be carried out continuously under adverse weather conditions, special precautions must be taken, such as heating the surface or air drying it when working indoors (see GB/T18570.4-2001). Special precautions should be taken when performing surface treatment work in flammable and explosive areas, such as preventing sparks, electrical discharges, and open flames.
4.3 Removal of pollutants
Oil, fats, dust and similar pollutants should be removed by appropriate methods before surface treatment. In addition, thick and firmly adhered rust and oxidation should be removed in advance by appropriate manual or machine methods. If specified or agreed upon, other methods should be used to remove water-soluble pollutants such as salts before or after the selected surface treatment method is used.
Applicable methods for removing pollutants can be found in ISO1 29444.5 Selection of surface treatment methods The selection of surface treatment methods should consider the following four aspects: The condition of the surface to be treated (see Chapter 4 of IS08502 and [IS08503]); The feasibility of the proposed method, such as whether the operating conditions, health, safety and environmental conditions meet the requirements, whether the surface treatment work can be completed within the scheduled period, etc.; The scope of surface treatment, whether the entire surface or a part of the surface to be treated; The required surface treatment level; The coating matching system to be used; Economic efficiency; Specific requirements for the operating conditions of the surface treatment process or the required surface treatment results (such as surface roughness or removal of water-soluble pollutants); Selection of surface treatment level GB/T 18839. 1—2002
The selection of surface treatment grade takes into account the following factors: - Description of the surface to be treated (see Chapter 4, IS) 8502 and ISO 8503); - Material matching system to be used; - Corrosiveness of the environment in which the surface after coating will be located; - Surface treatment area (all or part of the surface to be treated); - Feasibility of the surface treatment method used to achieve a certain surface treatment grade; - Economic efficiency.
The assessment of the cleanliness of the surface after treatment usually adopts the surface treatment grades specified in GB/T8923 and IS085012. When the parties concerned reach a consensus, other surface treatment grades may also be used. Other surface treatment grades can be defined by reference samples to be determined or by local reference surfaces of the object to be treated. If the latter is adopted, these references should be protected to prevent discoloration or preserved by photographing.
Only when the following requirements are met, the surface treatment grade with the highest surface cleanliness is specified, such as Sa3 defined in GB/8923.
a) Surface condition (such as the presence of a large number of corrosive pollutants on the surface), the requirements of the coating system to be used and/or the corrosive environment of the surface after coating;
h) The conditions that can be met to achieve and maintain this treatment grade (such as dry and clean air). The highest cleaning level is also appropriate when it can extend the maintenance interval and thus reduce maintenance costs (such as scaffolding and downtime).
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors:
1-Steel type:
Surface preparation method, including tools or materials used (such as abrasives for blast cleaning). In: TS(8u01-1 Supplement No. 1, dye sample photos of steel color changes after dry blast cleaning to Sa3 level with different metals and non-metals are provided. After surface treatment, the treated surface shall be evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the external allowable cleanliness of the surface shall be evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO85021 and TS8503-2.Condition changed: Years of use; - Rust grade assessed according to TS04628-3 and additional details on unfinished appearance of rust: "Blistering grade assessed according to TS04628-2:
Cracking grade assessed according to ISO4628-4:
Shedding grade assessed according to ISO4628-5:
- Additional details on stress, chemical and/or other contaminants. 4.2 Influence of site environmental factors
In order to reduce the cost of surface treatment, it is necessary to avoid storing unprotected steel in industrial or marine environments, as some substances that accelerate corrosion may cause serious contamination to the surface. The treatment should be as far as possible within the scope of GB8923 It should be carried out when the rust grade is A or B (C for manual treatment), and an appropriate primer should be applied as soon as possible. Under unfavorable weather conditions such as rain and snow, surface treatment operations should not be carried out outdoors using spray cleaning (see GB/T18839.2-2002) or other surface treatment methods. In order to minimize the possibility of condensation, the temperature of the surface to be treated should be higher than the dew point of the ambient air and at least 3 degrees higher than the dew point of the ambient air. If the above operations must be carried out continuously under adverse weather conditions, special precautions should be taken, such as working indoors, heating the surface or drying the air, etc. (see GB/T18570.4-2001), and surface treatment in flammable and explosive areas. Special precautions should be taken for operations such as preventing sparks, electrical shock, open flames, etc.
4.3 Removal of contaminants
Oil, grease, dust and similar contaminants should be removed by suitable methods before surface treatment. In addition, thick and firmly adhering rust and oxidation should be removed in advance by appropriate manual or machine methods. If specified or agreed, other methods should be used to remove water-soluble contaminants such as salts before or after the selected surface treatment method.
Applicable methods for removing contaminants can be found in ISO129444. 5 Selection of surface treatment methods
The selection of treatment methods should take into account the following four aspects: Surface condition (see Chapter 4 of IS08502 and [S08503]): - Feasibility of the proposed method, such as operating conditions, health, safety and environmental conditions, whether they can meet the requirements, whether the surface treatment work can be completed within the scheduled period, etc.: - Scope of surface treatment, whether it is all or part of the surface to be treated: Required surface treatment level; - Coating system to be used: - Economic efficiency: - Specific requirements for the operating conditions of the surface treatment process or the required surface treatment results (such as surface roughness or removal of water-soluble pollutants),
Selection of surface treatment level
GB/T 18839. 1—2002
The selection of surface treatment grade takes into account the following factors: - Description of the surface to be treated (see Chapter 4, IS) 8502 and ISO 8503); - Material matching system to be used; - Corrosiveness of the environment in which the surface after coating will be located; - Surface treatment area (all or part of the surface to be treated); - Feasibility of the surface treatment method used to achieve a certain surface treatment grade; - Economic efficiency.
The assessment of the cleanliness of the surface after treatment usually adopts the surface treatment grades specified in GB/T8923 and IS085012. When the parties concerned reach a consensus, other surface treatment grades may also be used. Other surface treatment grades can be defined by reference samples to be determined or by local reference surfaces of the object to be treated. If the latter is adopted, these references should be protected to prevent discoloration or preserved by photographing.
Only when the following requirements are met, the surface treatment grade with the highest surface cleanliness is specified, such as Sa3 defined in GB/8923.
a) Surface condition (such as the presence of a large number of corrosive pollutants on the surface), the requirements of the coating system to be used and/or the corrosive environment of the surface after coating;
h) The conditions that can be met to achieve and maintain this treatment grade (such as dry and clean air). The highest cleaning level is also appropriate when it can extend the maintenance interval and thus reduce maintenance costs (such as scaffolding and downtime).
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors:
1-Steel type:
Surface preparation method, including tools or materials used (such as abrasives for blast cleaning). In: TS(8u01-1 Supplement No. 1, dye sample photos of steel color changes after dry blast cleaning to Sa3 level with different metals and non-metals are provided. After surface treatment, the treated surface shall be evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the external allowable cleanliness of the surface shall be evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO85021 and TS8503-2.Condition changed: Years of use; - Rust grade assessed according to TS04628-3 and additional details on unfinished appearance of rust: "Blistering grade assessed according to TS04628-2:
Cracking grade assessed according to ISO4628-4:
Shedding grade assessed according to ISO4628-5:
- Additional details on stress, chemical and/or other contaminants. 4.2 Influence of site environmental factors
In order to reduce the cost of surface treatment, it is necessary to avoid storing unprotected steel in industrial or marine environments, as some substances that accelerate corrosion may cause serious contamination to the surface. The treatment should be as far as possible within the scope of GB8923 It should be carried out when the rust grade is A or B (C for manual treatment), and an appropriate primer should be applied as soon as possible. Under unfavorable weather conditions such as rain and snow, surface treatment operations should not be carried out outdoors using spray cleaning (see GB/T18839.2-2002) or other surface treatment methods. In order to minimize the possibility of condensation, the temperature of the surface to be treated should be higher than the dew point of the ambient air and at least 3 degrees higher than the dew point of the ambient air. If the above operations must be carried out continuously under adverse weather conditions, special precautions should be taken, such as working indoors, heating the surface or drying the air, etc. (see GB/T18570.4-2001), and surface treatment in flammable and explosive areas. Special precautions should be taken for operations such as preventing sparks, electrical shock, open flames, etc.
4.3 Removal of contaminants
Oil, grease, dust and similar contaminants should be removed by suitable methods before surface treatment. In addition, thick and firmly adhering rust and oxidation should be removed in advance by appropriate manual or machine methods. If specified or agreed, other methods should be used to remove water-soluble contaminants such as salts before or after the selected surface treatment method.
Applicable methods for removing contaminants can be found in ISO129444. 5 Selection of surface treatment methods
The selection of treatment methods should take into account the following four aspects: Surface condition (see Chapter 4 of IS08502 and [S08503]): - Feasibility of the proposed method, such as operating conditions, health, safety and environmental conditions, whether they can meet the requirements, whether the surface treatment work can be completed within the scheduled period, etc.: - Scope of surface treatment, whether it is all or part of the surface to be treated: Required surface treatment level; - Coating system to be used: - Economic efficiency: - Specific requirements for the operating conditions of the surface treatment process or the required surface treatment results (such as surface roughness or removal of water-soluble pollutants),
Selection of surface treatment level
GB/T 18839. 1—2002
The selection of surface treatment grade takes into account the following factors: - Description of the surface to be treated (see Chapter 4, IS) 8502 and ISO 8503); - Material matching system to be used; - Corrosiveness of the environment in which the surface after coating will be located; - Surface treatment area (all or part of the surface to be treated); - Feasibility of the surface treatment method used to achieve a certain surface treatment grade; - Economic efficiency.
The assessment of the cleanliness of the surface after treatment usually adopts the surface treatment grades specified in GB/T8923 and IS085012. When the parties concerned reach a consensus, other surface treatment grades may also be used. Other surface treatment grades can be defined by reference samples to be determined or by local reference surfaces of the object to be treated. If the latter is adopted, these references should be protected to prevent discoloration or preserved by photographing.
Only when the following requirements are met, the surface treatment grade with the highest surface cleanliness is specified, such as Sa3 defined in GB/8923.
a) Surface condition (such as the presence of a large number of corrosive pollutants on the surface), the requirements of the coating system to be used and/or the corrosive environment of the surface after coating;
h) The conditions that can be met to achieve and maintain this treatment grade (such as dry and clean air). The highest cleaning level is also appropriate when it can extend the maintenance interval and thus reduce maintenance costs (such as scaffolding and downtime).
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors:
1-Steel type:
Surface preparation method, including tools or materials used (such as abrasives for blast cleaning). In: TS(8u01-1 Supplement No. 1, dye sample photos of steel color changes after dry blast cleaning to Sa3 level with different metals and non-metals are provided. After surface treatment, the treated surface shall be evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the external allowable cleanliness of the surface shall be evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO85021 and TS8503-2.Cleanliness etc. are also appropriate.
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors: Surface condition before treatment:
1- Steel type:
Surface treatment method, including tools or materials used (such as abrasives for blast cleaning). In: TS(T)8u01-1 Supplement 1, a dye sample photo of the color change of steel that has been dry blast cleaned to Sa3 level with different metals and non-metals is provided. After surface treatment, the treated surface is evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the surface is allowed to be cleaned according to the external specification.
If specified or agreed, the surface is also additionally evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO(T)85021 and TS8503-2.Cleanliness etc. are also appropriate.
7 Evaluation of treated surfaces
The appearance of the treated surface is related to the following factors: Surface condition before treatment:
1- Steel type:
Surface treatment method, including tools or materials used (such as abrasives for blast cleaning). In: TS(T)8u01-1 Supplement 1, a dye sample photo of the color change of steel that has been dry blast cleaned to Sa3 level with different metals and non-metals is provided. After surface treatment, the treated surface is evaluated according to the method specified in GB/T8923 or ISO8501-2, that is, the surface is allowed to be cleaned according to the external specification.
If specified or agreed, the surface is also additionally evaluated according to ISO/TR8502-1, GB/T18570.2--2001, JS)85029, ISO(T)85021 and TS8503-2.
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