This standard specifies the surface preparation methods for steel materials before coating - manual and power tool cleaning. This standard applies to new steel components, and also to steel surfaces that have been previously coated but have some areas damaged or need to be re-coated. GB/T 18839.3-2002 Surface preparation methods for steel materials before coating - manual and power tool cleaning GB/T18839.3-2002 Standard download decompression password: www.bzxz.net
This standard specifies the surface preparation methods for steel materials before coating - manual and power tool cleaning. This standard applies to new steel components, and also to steel surfaces that have been previously coated but have some areas damaged or need to be re-coated.

ICS 25. 220. 10
National Standard of the People's Republic of China
GB/T 18839.3—2002
eqv1s0 8504-3:1993
Surface preparation of steel substrates before application of paintsand related products-Surface preparation methodsHand-and power-teol cleaning2002-09-13Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on March 1, 2003
GB/T 18B39.3 2002
This standard is compiled based on the international standard TS () 85043: 19936 Surface treatment of steel before coating - surface treatment methods - manual and dynamic tool cleaning. It is equivalent to the international standard in terms of technical content. This standard deletes the reference to IS () 8501-3. This standard specifies the manual and dynamic tool cleaning methods. It should be used together with GB/T18839.1--2002 Surface treatment methods for steel before coating - general principles (eISO85041: 2000). Annexes A and I of this standard are both indicative requirements. This standard is proposed by China Shipbuilding Industry Corporation. It is not under the jurisdiction of the Tenth Institute of China Shipbuilding Industry. The originating unit of this standard: the Tenth Institute of China Shipbuilding Industry. The main drafters of this standard: Fu Jianhua, Yin Hua. GB/T18839.3-2002
ISO Foreword
The International Organization for Standardization (ISO) is a worldwide federation of member bodies of the International Standards Commission (ISC). The work of developing international standards is carried out by technical committees of ISO. Each member body interested in the subject covered by a technical committee has the right to be represented on that technical committee. International organizations, governmental or non-governmental, in liaison with ISO may also participate in this work. The International Electrotechnical Commission (IEC) collaborates closely in all aspects of electrotechnical standardization. Each technical committee invites the Board to draft international standards. Before the Board approves them as national standards, they should be sent to the member bodies for a technical vote. According to the ISO standard formulation procedure, an international standard must be approved by at least 5% of the member bodies to become an international standard. International standards should be prepared in accordance with the provisions of Part 3 of the ISO/IFC Guidelines. Note that some of the contents of this part of ISO851 may involve patent rights. ISO shall not be held responsible for identifying any or all such patent rights. This International Standard IS (8504-3:1993-1) has been prepared by ISO/TC 35/SC 12, Technical Committee on Paints and Varnishes - Preparation of steel substrates before application of paints and varnishes - Surface preparation methods. It consists of the following parts under the general title "Surface preparation of steel substrates before application of paints and varnishes - Methods of surface preparation": Part 1: General Part 2: Abrasive blasting cleaning Part 3: Cleaning by hand and by power tools Some other parts are in preparation Appendix A and Annex B of this standard are indicative. 1 Scope National Standard of the People's Republic of China Surface preparation of steel substrates before application of paints and varnishes - Methods of surface preparation Cleaning by hand and by power tools Preparation of steel substrates before application of paints and varnishes - Methods of surface preparation Preparation of steel substrates before application of paints and varnishes - Methods of surface preparation preparation mucthods-Hand-and power-tool cleaning
This standard specifies the methods for the preparation of steel surfaces before coating GH/T 18839.3
c4jv ISO 8504-3: 1993
For hand-and power-tool cleaning,
This standard applies to new steel components. It also applies to steel surfaces that have been previously coated but have some areas or damage or parts that need to be re-coated.
2 Cited standards
The clauses contained in the following standards constitute the clauses of the standards through reference in this standard. When the standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest version of the following standards. CB/T8923—1988 Coating Surface rust grade and rust removal grade of steel before coating (eISO85011:1988) GB/T18839.1—2002 Surface treatment of steel before coating and removal of materials General principles for surface treatment methods (cqVIS8504-1:2000) IS()8501-2:1991 Surface treatment of materials before coating Visual assessment of surface cleanliness Part 2: Rust removal grade of steel after removal of the original coating on the surface of the treated steel 3 Definitions
This standard adopts the following definitions:
3.1 Hand tool cleaning hand-1ool Cleaning is the process of removing foreign matter from the substrate surface using manual tools. Note: The tools usually used are sharp hammers, knives, wire brushes, sandpaper, etc. Sometimes, tool cleaning is used as a method to remove relatively loose dirt before using power tools.
3. 2 Power tool cleaning Power-tonl cleaning is the process of removing foreign matter from the substrate surface using power tools. Note 2: The power tools used are electric or pneumatic gears, rotary wire brushes, grinding wheels, grinding paper discs, sand mills, fire hammers, needle beam rust removers and plastic bristles embedded with abrasives, etc. 3.3 Solvent cleaning Solvent cleaning is a method of removing various obvious oils, greases, dirt, lubricants and other permeable contaminants on the surface of steel. Note 3: These methods usually include cleaning with a commercially available single-use flame with a chlorine-free agent, spraying with a cleaning agent, using water or steam containing a chlorine-free agent or a magnetic disinfectant. 3.4 Contaminated surface A surface on which substances that may have an adverse effect on the performance of the anti-corrosion coating system are present Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on September 13, 2002 and implemented on March 1, 2003 GB/T 18839.3-2002 The tested contaminants include rust, chromium, urine residue and welding condensate, other non-toxic salts, including oxides. 3.5 Clean surface Surface
has been free of contaminants and has reached the required activity level. 4. Process procedures
Note: This process is for surface treatment operations. Safety rules should be followed when performing them. 4.1 Initial treatment
After cleaning with power tools, use only partial methods to remove thick layers of oil or grease, and then use the following methods to further remove contaminants as much as possible
&) Rigid red fiber or wire brush shaving| |tt||) For cleaning, see Appendix B (Instructions):
) For cleaning with solvents or liquids (e.g. milk liquid minus detergent), then rinse the surface with fine water: ! : For cleaning with negative fibers or silk, rinse with rice water or steam. wwW.bzxz.Net
4.2 Cleaning of manual tools
For cleaning, see Appendix A (Instructions): It is best to follow the following sequence of operations: a) Remove all laminar rust and scale from the tool: ! ! Remove all loose weld slag and weld spatter by knocking it off manually, scraping it with a scraper or other similar impact method to remove all loose, sulphurized or loosely attached rust or scale.
4.3 Power tool treatment
Power tools are used for work, see Appendix 1. It is best to follow the following sequence of operations. If you start with hand tools, you can clean the power tools as necessary. Use power tools with rotating or impact force to remove rust and reach the specified or agreed surface treatment level: h) Use power tools with rotating or impact force to remove welding liquid or flying objects. To achieve the specified surface treatment level:
Use power wire brushes, power sanders, power punching tools or power tools with rotating force to remove loose oxide scale, loose, non-common and loose coatings to reach the specified or agreed surface treatment level. Pay attention not to polish the surface. 4.1 Final surface treatment before coating
Any burrs, sharp edges and sharp cut edges produced during the coating process should be removed (see 6B/T18939.1-2002). Unless otherwise specified, the surface of the coating should be polished to remove the gloss of the existing coating layer and the edges should have a slope. If necessary, any loose materials caused by the surface being damaged should be removed by a vacuum cleaner or by exhaust air.
5 Reference standards
Except for "goods that have not been agreed upon", other reference standards should be used as a supplement to the first one. These reference standards may be sample photos provided by the +-party, or the official Sichuan version of the reference standards given in 8923 or 1501-2. 5 Inspection
Complete inspection and elimination process (step 2 of the first chapter)
GB/r18839.3-2002
(Reminder Appendix)
Types of hand tools and their uses
A possible use of equipment The tools include the following: knives, scrapers, chisels, pointed hammers, hammers to remove welding paint, layered rust, remove old road layers, loosen rust, etc. l)
Wire brushes, sandpaper and plastic tools embedded with abrasives are used for the final processing, including making a slope against the edge of a solid coating
"Spark-free" tools should be used in flammable and explosive places, but for tools made of metals such as bronze, its metal residues will cause electrochemical corrosion and are not suitable for use in such situations. The most abrasive plastic tools are more suitable for such situations. B
(Appendix of Tips)
Types of power tools and their uses
B1 Power tools are generally driven by compressed air or electricity. The power tools that can be used include the following:! 1) Sharp rotary scale remover. Used to remove the most chemically modified oxide scale, including thick oxide scale; 2) Rust remover. Used to remove rust, scale or old coating on welds, bearings and hardware: 3) Grinding wheel plate, grinding wheel salt, rotary wire brush, rotary sandpaper disc, and angled plastic felt, etc. - used to remove rust, scale and secret coating: 1) Before surface treatment, use a grinding machine to grind welds, edges, etc. B2 When using dynamic descaling tools, pay attention to the following: If the surface of the steel material is too warped, the specified thickness of the material cannot completely cover the edges and ridges, which may cause the material to fail. Similarly, excessive cleaning with a wire brush or rubbing with sandpaper will also damage the adhesion of the paint. For example, residual scale is easy to form a layer, making it difficult for the paint to adhere. The rust remover should be limited to seams, corners and unfinished edges, because the impact of rust removal on the flat surface will cause the surface roughness to be aroused. Use "non-sparking" tools (see the last paragraph of Appendix A) in places that are prone to flammable and explosive.
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