GB/T 18593-2010 Fusion-bonded epoxy powder coatings for anti-corrosion coating GB/T18593-2010 standard download decompression password: www.bzxz.net
This standard specifies the materials, process specifications, coating performance requirements and test methods for fusion-bonded epoxy powder coatings for anti-corrosion coating of metal materials such as steel. This standard is not applicable to decorative coatings. ||
tt|| This standard replaces GB/T18593-2001 "Fusion-bonded epoxy powder coatings for anti-corrosion coating".
Compared with GB/T18593-2001, the main changes of this standard are as follows:
a) The definition of "structural parts" in 3.5 is added;
b) "Curing time" and "Magnetic content" are added to the technical index table 1 of epoxy powder coatings;
The density test standard is changed from Appendix A to GB/T4472, and the volatile matter and gel time test standards are changed from GB/T16592 and GB/T16995 to GB/T6554 respectively;
c) The minimum thickness of the second type of coating in Table 2 is changed from 130μm to 150μm;
d) Physical performance indicators of coatings:
———A column for repair layer is added;
———The impact resistance index of the first and third types of coatings at room temperature is cancelled, and the impact resistance index of the third type of coating at -30℃ in Table 3 is added;
———The wear resistance test standard of coating in Table 3 was changed from SY/T0315 to GB/T1768;
———The bonding strength value of coating type 1 was added, and the bonding strength value of coating type 3 was revised;
———The selectivity indexes of "electrical strength", "volume resistivity" and "chloride ion penetration" were added to coating type 2;
———The cross-sectional porosity and interfacial porosity indexes of coating types 1 and 3 were revised from level 1 to 4 to level 1 to 3;
———The test content of "distilled water absorption (60 ℃, 15 days)" of coating types 1, 2 and 3 was added. The test content of "distilled water" medium in Appendix A was deleted.
e) Added the "processability test" and "type inspection" clauses for Class 1 coatings (see 7.1 and 10.4 and Table 4);
f) Added three chapters: "Marking, shipment and storage of finished products", "Safety, hygiene and environmental protection of coating production", and "Completion documents".
Appendix A of this standard is a normative appendix.
This standard is proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-metallic Coatings.
Drafting units of this standard: Institute of Metal Research, Chinese Academy of Sciences, National Engineering Research Center for Metal Corrosion Control, Wuhan Institute of Materials Protection, China Petroleum Pipeline Technology Research Center, Institute of Building Structures, China Academy of Building Research.
Main drafters of this standard: Li Jing, Lu Weizhong, Zhang Lixin, He Zhiduan, Jia Jianxin, Du Xiuling, Shi Zhihua, Li Xiaodong, Gao Ying, Shi Jiezhi.
The previous versions of the standards replaced by this standard are:
———GB/T18593—2001.
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this standard.
GB/T1034 Determination of water absorption of plastics (GB/T1034-2008, ISO62:2008, IDT)
GB/T1408.1 Test methods for electric strength of insulating materials Part 1: Tests at power frequency (GB/T1408.1-2006, IEC60243-1:1988, IDT)
GB/T1410 Test methods for volume resistivity and surface resistivity of solid insulating materials (GB/T1410-2006, IEC60093:1980, IDT)
GB/T1768 Determination of abrasion resistance of paints and varnishes - Rotating rubber grinding wheel method (GB/T1768-2006, ISO7784:1997, IDT)
GB/T1771 Determination of neutral salt spray resistance of paints and varnishes (GB/T1771-2007, ISO7253:1996, IDT)
GB/T4472 General rules for determination of density and relative density of chemical products
GB5749 Sanitary standard for drinking water
GB/T6329 Determination of tensile strength of adhesive butt joints (GB/T6329-1996, eqvISO6922:1987)
GB/T6554 Resin-based reaction compounds for electrical insulation Part 2: Test methods for coating powders for electrical use (GB/T6554-2003, IEC60455-2-2:1984, MOD)
GB7692 Safety regulations for painting operations Safety of pre-painting process and ventilation purification
GB/T8923 Surface rust grade and rust removal grade of steel before coating (GB/T8923—1988, eqvISO8501-1:1988)
GB9686 Hygienic standard for polyamide epoxy resin coatings on the inner wall of food containers
GB50152 Standard for test methods of concrete structures
GBJ87 Noise control design specification for industrial enterprises
GBZ1 Hygienic standard for design of industrial enterprises
ISO14654:1999 Epoxy-coated steel in reinforced concrete
JB/T6570 Determination method for magnetic content of ordinary abrasives
JG/T3042—1997 Epoxy resin coated steel bars
SY/T0315—2005 Technical standard for external coating of fusion-bonded epoxy powder for steel pipelines
Foreword III
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Technical information and requirements to be provided by the purchaser 2
5 Coating classification 2
6 Materials 2
7 Process specifications 3
8 Repair of fusion-bonded epoxy coatings 4
9 Performance requirements and test methods for fusion-bonded epoxy coatings 4
10 Inspection rules 6
11 Labeling, shipping and storage of finished products 6
12 Safety, hygiene and environmental protection in coating production 7
13 Handover documents 7
Appendix A (Normative Appendix) Specified media and conditions for chemical corrosion resistance test of coatings 8

ICS25.220.60
People's Republic of China Baobiaoya
GB/T18593—2010
Replaces GB/T18593—2001
Anti-corrosive painting of fusion bonded epoxy coating powders2010-08-09 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
Implementation on 2010-12-31
Normative references
Terms and definitions
Technical information and requirements to be provided by the purchaser
Coating classification
Process specification
Repair of fusion bonded epoxy coating
Fusion bonded epoxy coating Performance requirements and test methods for the layer
Identification, shipment and storage of finished products
Safety, hygiene and environmental protection of coating production 13
Completion documents.
Appendix A (Normative Appendix)
Specified media and conditions for chemical corrosion resistance test of coatings GB/T18593—2010
This standard replaces GB/T18593-2001 "Anti-corrosion coating of fusion-bonded epoxy powder coatings". Compared with GB/T18593-2001, the main changes of this standard are as follows: the definition of 3.5 "structural parts" is added;
Table 1 of technical indicators of epoxy powder coatings adds "curing time" and "magnetic content"; b)
GB/T18593-2010
The density test standard is changed from Appendix A to GB/T4472. The volatile matter and gel time test standards are changed from GB/T16592 and GB/T16995 to GB/T6554 respectively;
The minimum thickness of the second type of coating in Table 2 is changed from 130μm to 150um; Physical performance indicators of coatings:
Added a column for repair layer:
The room temperature impact resistance index of the first and third types of coatings is cancelled The impact resistance index of the third type of coating at 30℃ in Table 3 was added; the wear resistance test standard of the coating in Table 3 was changed from SY/T0315 to GB/T1768; the bonding strength value of the first type of coating was added, and the bonding strength value of the third type of coating was revised; the selectivity indexes of "electrical strength", "volume resistivity" and "chloride ion penetration" were added to the second type of coating; the cross-sectional porosity and interface porosity indexes of the first and third types of coatings were revised from 1 to 4 to 1 to 3; the test content of "distilled water absorption (60℃, 15 days)" for the first, second and third types of coatings was added. The test content of the "distilled water" medium in Appendix A was deleted.
e) The "processability test" and "type inspection" clauses for the first type of coating were added (see 7.1 and 10. 4 and Table 4); f) Three chapters have been added: "Identification, shipment and storage of finished products", "Safety, hygiene and environmental protection of coating production", and "Completion documents". Appendix A of this standard is a normative appendix. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-metallic Coatings. The drafting units of this standard are: Institute of Metal Research, Chinese Academy of Sciences, National Engineering Research Center for Metal Corrosion Control, Wuhan Institute of Materials Protection, China Petroleum Pipeline Technology Research Center, and Institute of Building Structures, China Academy of Building Research. The main drafters of this standard are: Li Jing, Lu Weizhong, Zhang Lixin, He Zhiduan, Jia Jianxin, Du Xiuling, Shi Zhihua, Li Xiaodong, Gao Ying, and Shi Jiezhi. The previous versions of the standards replaced by this standard are: GB/T 18593—2001.
1 Scope
Anti-corrosion coating of fusion-bonded epoxy powder coating GB/T18593—2010
This standard specifies the materials, process specifications, coating performance requirements and test methods for anti-corrosion coating of fusion-bonded epoxy powder coating on metal materials such as steel.
This standard does not apply to decorative coatings.
2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For all referenced documents with a date, all subsequent amendments (excluding lapsed content) or revisions are not applicable to this standard. However, the parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions shall apply to this standard. GB/T1034 Determination of water absorption of plastics (GB/T1034-2008, ISO62:2008.IDT) GB/T1408.1
Test methods for electrical strength of insulating materials
Part 1: Tests at power frequency (GB/T1408.1—2006, IEC 60243-1:1988, IDT)
GB/T 1410
1980, IDT)
GB/T1768
GB/T 1771
GB/T 4472
GB5749
Test method for volume resistivity and surface resistivity of solid insulating materials (GB/T1410-2006, IEC60093: Determination of abrasion resistance - Rotating rubber grinding wheel method (GB/T1768-2006, ISO7784:1997, Paints and varnishes
Paints and varnishes
Determination of neutral salt spray resistance (GB/T1771-2007, ISO7253:1996, IDT) General rules for determination of density and relative density of chemical products Hygienic standards for drinking water
GB/T6329
GB/T 6554
Determination of tensile strength of adhesive butt joints (GB/T6329-1996, eqvISO6922:1987) Resin-based reaction composites for electrical insulation
(GB/T6554-2003.IEC60455-2-2.1984.MOD) GB7692
Part 2: Test methods
Coating powder method for Yundian||tt ||Safety regulations for painting operationsSafety of pre-painting treatment process and its ventilation purificationGB/T8923
GB9686
GB50152
Rust level and rust removal level of steel surface before painting (GB/T8923-1988, eqvISO8501-1:1988)Sanitary standard for polyamide epoxy resin coating on the inner wall of food containersStandard for test methods of concrete structures
Industrial enterprises Noise control design specification
GBZ1 Industrial enterprise design hygiene standard
ISO14654:1999 Epoxy coated steel in reinforced concreteJB/T6570 Determination method of magnetic content of ordinary abrasiveJG/T3042-1997
Epoxy resin coated steel bars
SY/T0315-2005 Technical standard for fusion bonded epoxy powder coating of steel pipelines3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
4fusionbondedepoxycoatingpowdersFusion bonded epoxy powder coatings
Thermosetting fusion bonded powder coatings with epoxy resin as the main film-forming material are also called "fusion bonded epoxy powder coatings", which are referred to as "epoxy powder coatings" in this standard.1
GB/T18593-2010
"epoxy powder coatings".
fusion bonded epoxy coatings (layers) are films formed by curing epoxy powder coatings through the fusion bonding coating process, also known as fusion bonded epoxy coatings, referred to as "coatings" in this standard.
fusion bonded epoxy painted steel bars
steel bars coated with epoxy powder coatings.
processing pipes and fittings
processing pipes and fittings fittingsPipes designed according to production process requirements, such as straight pipes, elbows, tees, reducers, bellows and other pipes of various shapes3.5
Structural parts
structures
Various shapes of tanks, troughs, racks, plates, rods, wires and other equipment, workpieces or combined components. 4 Technical data and requirements to be provided by the purchaser
4.1 National standard number.
The brand, specification and surface condition of the base material to be coated. 4.2
Select the type of coating (Type 1, 2 or 3). 4.3
Select the thickness and coating structure of the coating.
Application environment or medium conditions of the coating product. Sampling and inspection.
5 Classification of coatings
5.1 Class 1 coatings
5.1.1 Anti-corrosion coatings for the outer walls of buried pipelines, underwater pipelines and steel piles. 5.1.2 Anti-corrosion coatings for the inner walls of pipelines transporting oil, natural gas, fresh water, seawater or sewage. 5.2 Class 2 coatings
Anti-corrosion coatings for steel bars.
5.3 Class 3 coatings
5.3.1 Protective coatings for the inner and outer walls of process pipelines working in severe corrosion environments. 5.3.2 Protective coatings for the inner and outer walls of structural parts working in severe corrosion environments. 6 Materials
6.1 Substrates
6.1.1 Each batch of steel substrates to be coated should have certification documents for the relevant materials, manufacturing and specifications that meet national standards or user requirements. 6.1.2 Each batch of steel substrates to be coated shall be inspected piece by piece (batch) for structural appearance and dimensions, and parts that do not meet manufacturing standards or contract requirements shall be removed. bzxZ.net
6.2 Epoxy Powder Coatings
6.2.1 The label of each batch of epoxy powder coating products shall indicate: manufacturer name, product name and model, batch number, weight, production date, storage conditions, and storage period.
6.2.2 Epoxy powder coatings shall be accompanied by the manufacturer's product manual, factory inspection certificate, quality certificate and test report and other relevant technical documents.
6.2.3 Epoxy powder coatings should be thermosetting powders containing epoxy resin. 6.2.4 The coating plant or workshop shall store epoxy powder coatings in accordance with the conditions specified by the coating manufacturer. 6.2.5 The performance of epoxy powder coatings shall meet the technical indicators in Table 1 before using repair agents.
GB/T18593—2010
The repair agent should be a two-component coating based on epoxy resin or modified epoxy resin or other materials that are compatible with the original coating and have equivalent performance.
Test items
Volatile matter
Particle size distribution
Gel time
Curing time
Magnetic content
Technical indicators of epoxy powder coatings
Technical indicators
Uniform color, no caking
Particle size (>150μm)≤3
Particle size (>250μm)≤0.2
Value provided by the manufacturer ±20%
Value provided by the manufacturer ±20%
≤0.002 0
For special-purpose epoxy powder coatings, the density value shall be controlled within 20% of the value provided by the manufacturer. A
Process specification
Process suitability test
Test standard
GB/T 4472
GB/T 6554
GB/T 6554
GB/T 6554
SY/T0315
JB/T6570
Before coating production, the test pipe section shall be coated according to the proposed production process, and the anti-corrosion coating shall be tested. The test items and performance indicators shall meet the requirements in Table 4.
Surface treatment of steel substrate
7.2.1 Before coating, the edges and corners of the surface of the part to be coated shall be ground into a fillet with R ≥ 2mm, and the weld part shall be free of sharp corners, lack of meat, pores, cracks, gaps and welding slag; remove the defects and flaws on the surface of the part to be coated that are easy to cause pinholes and uneven coating thickness. 7.2.2
Volatile substances.
Cast iron parts to be painted should be preheated and baked to fully remove the residual moisture and other volatile substances in the tiny gaps and defects on the castings. Before coating, the dust, oil, grease and other pollutants on the surface of the parts to be painted should be cleaned by appropriate methods. 7.2.4
According to GB/T8923, the surface of the parts to be painted should be sandblasted or shot blasted to remove rust. It should reach the Sa2.5 level or above standard. The depth of the staggered pattern should be within the range of 40μm~100μm.
The parts to be painted should be visually inspected again to eliminate the defects and flaws found. Use purified compressed air or a metal brush to remove the residues left on the surface of the substrate due to the above process. 7.2.6
The surface of the steel bar after purification should be inspected according to the requirements of Appendix A of JG/T3042-1997. The cleanliness should not be less than 95% before the second type of coating can be applied.
Parts to be painted that do not require painting should be covered and protected. After the surface treatment of the parts to be painted, the coating should be carried out within 8 hours. Before coating, no visible rust should appear on the surface of the parts to be painted. Otherwise, the surface treatment should be carried out again.
7.3 Preheating
7.3.1 Parts to be painted can be preheated in different ways, such as using a heating furnace or induction coil. 7.3.2 The preheating temperature is determined according to the temperature recommended by each powder coating manufacturer, but shall not exceed 275℃. If the surface of the painted part becomes dark blue or dark brown due to over-oxidation caused by excessive temperature or long preheating time, the surface treatment should be carried out again. 3
GB/T18593—2010
7.4 Coating
7.4.1 Electrostatic spraying, friction electrostatic spraying, fluidized bed, electrostatic fluidized bed and other methods can be used for coating to ensure that the coating reaches the required thickness and uniformity.
7.4.2 An oil-free air compressor should be used, and an air dryer should be provided to remove oil and water from the compressed air used for powder supply in advance. 7.5 Coating curing
7.5.1 Unless otherwise required, the curing of Class 1 and Class 2 coatings is completed by utilizing the residual heat of the preheated substrate, and no additional heating curing is required. 7.5.2 Class 3 coatings need to be heated and cured again after coating. The specific curing temperature and time shall be carried out according to the conditions recommended by the epoxy powder coating manufacturer.
8 Repair of fused epoxy coating
For the first type of coating, if there are a few pinholes (1 to 2/m) or unqualified parts with an area less than 25cm2, local repair is allowed. 8.1
For the second type of coating, if the defect area does not exceed 1% of the surface area of ​​the 0.3m long steel bar, repair is allowed. When pinholes appear locally in the third type of coating, the coating with pinholes should be removed and re-coated according to the coating process in Chapter 7. 8.2 Before repairing or re-coating, all oil, rust, and impurities should be removed, loose coatings should be peeled off, and the area should be polished into a rough surface. The joint between the repair layer and the surrounding intact coating should be polished into a wing shape, and then the surface should be cleaned. 8.3 The coating repair should use a suitable repair agent, and the physical properties of the repair layer should meet the indicators in Table 3. The coating thickness of the repair area shall not be less than the designed thickness, and the overlap width with the original coating shall not be less than 10mm. Performance requirements and test methods for fusion bonded epoxy coatings 9
The thickness of the coating shall comply with the requirements of the engineering design. If there is no requirement in the design, it can be selected according to the requirements of Table 2 based on the coating use conditions. Table 2 Coating thickness
Coating type
Category 1
Category 2
Category 3
Coating grade
Ordinary grade
Reinforced grade
Extra strong grade
Ordinary grade
Reinforced grade
Extra strong grade
Reference thickness
150-~300
Unit: micrometer
Note: The requirements for coating thickness do not include the area to be repaired due to coating defects or damage. Under severe vinegar conditions, the thickness of the second type of coating can be increased to 400 μm.
9.2 Physical properties of coating
9.2.1 Before coating construction, the coating performance test shall be carried out in the laboratory, and its physical properties shall meet the requirements of Table 3. The provisions for specimen preparation are shown in 9.2.2.
9.2.2 The preparation of laboratory coated parts shall meet the following provisions: 9.2.2.1 The test piece substrate shall be low carbon steel or the same substrate as the part to be coated. 9.2.2.2 The surface of the test piece shall be sprayed, and its rust removal quality shall reach Sa2.5 level according to the provisions of GB/T8923, and the anchor pattern depth shall be between 40μm and 100μm.
9.2.2.3 The temperature for preheating the test piece and curing the coating shall be selected according to the recommended value of the epoxy powder manufacturer. 4
Test items
Impact resistance (24℃±2℃)
Impact resistance (-30℃)
Bending resistance (3°)
Bending resistance (24℃±2℃)
Abrasion resistance (Cs10 wheel, 1kg
1 000 r)
Adhesion (75℃, 48h)
Bond strength
Bond strength (between coated steel bar and concrete)
Cathode stripping
(65℃,24h or 48h)
Cathode stripping
Electrical strength
Volume resistivity
Cross-section porosity
Interface porosity
Distilled water absorption
(60℃, 15 days)
Chloride permeability
Physical properties of coating
Performance index
Class 1
No crack
(0℃ or 30℃）
≥1101s
Class 2
Class 3
Uniform color, no bubbles, no cracks
No cracks (normal temperature)
No cracks
≥Bare steel bars and concrete
Bonding between concrete
80% of strength
≥30b
≥1×1013
1×10-4
≤100
≥1×1013
GB/T18593—2010
Standard test method
Repair layer
JG/T3042
≤100
>1×10
SY/T0315
SY/T0315
JG/T3042
GB/T1768
SY/T0315
GB/T 6329
GB50152
SY/T 0315
JG/T 3042
GB/T 1408.1
GB/T1410
SY/T0315
SY/T0315
GB/T1034
JG/T 3042
The room temperature bending resistance of Class 3 coating is a selective indicator and the test method specified in SY/T0315 is adopted. However, the sample should be placed at room temperature for 24 hours before the measurement and should not be placed in a low-temperature freezer.
b Selective index (24℃±2℃)
The thickness of the test piece coating shall be 350μm±50μm for Class 1 and Class 3 coatings and 250μm±50μm for Class 2 coatings9.2.2.4
9.2.2.5The test of laboratory coated parts shall comply with the provisions of Table 3. After curing, the coated test piece shall be placed at 23℃±5℃ or room temperature for 24h before the performance test can be carried out according to the operating steps9.2.2.6
in each test method.
9.3 Chemical corrosion resistance of coating
The chemical corrosion resistance test method of various coatings shall be carried out in accordance with GB/T6554. It is required that no peeling, cracking, softening, powdering, deterioration, etc. shall occur within a certain temperature and time9.3.1
in the specified medium. The specified media and conditions are listed in Appendix A or as stipulated in the contract between the supplier and the buyer.
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