Specifications for phosphating treatment of iron and steel parts before painting
Some standard content:
ICS 25.220.10
National Standard of the People's Republic of China
GB/T 6807—2001
Specifications for phosphating treatment of iron and steel parts before coating painting2001-12-17 Issued
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
2002-06-01 Implementation
People's Republic of China
National Standard
Technical Conditions for Phosphating Treatment of Steel Workpieces Before Painting GB/T68C7-2001
Published by China Standards Press
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GB/T6807—2001
This standard is a revision of GB/T6807--1986. The main technical contents have the following changes: According to the requirements of GB/T1.1, the foreword, scope and referenced standards are added, and \2.8.2.3.3.2\ and the related \Appendix D drip method (reference)" in the original standard are deleted. Appendix A of this standard Appendix A is the appendix of the standard, and Appendix B is the indicative appendix. This standard replaces GB/T 6807-1986 from the date of implementation. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metallic and Non-metallic Coatings. The responsible drafting unit of this standard is: Wuhan Institute of Material Protection. The main drafters of this standard are: Li Xinli, Yin Xiongzhi, Li Anzhong, Huo Dongzhi, Wan Jun. This standard was first issued on August 28, 1986. 1 Scope
National Standard of the People's Republic of China
Technical conditions for phosphating treatment of iron and steel parts before painting GB/T 6807-2001
Replaces G/T 68071986
This standard specifies the classification, technical requirements, inspection methods and acceptance rules of phosphate coating before coating of steel workpieces. This standard is applicable to the phosphating treatment of steel workpieces before coating. The phosphating film formed by the treatment is used as the coating base to enhance the adhesion and corrosion resistance of the coating film to the steel substrate and improve the coating quality of steel workpieces. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All existing standards will be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards. GR/T 1765- - 1979
G:R/T 17711991
GB/T 2828---1987
GB/T 9286—1998
GB/T 9792—1988
HG/T2594--1994
3 Classification of phosphate coatings
Determination of heat resistance, salt spray resistance and weather resistance (artificial acceleration) of paint films Preparation of paints and varnishes Determination of neutral salt spray resistance (eg1S(7253:1984) Batch inspection Sampling procedures and sampling tables (applicable to inspection of continuous batches) Cross-cut test for paint and varnish films (cqIS0)2409:1992) Determination of film mass per unit area of conversion coating on metal materials Gravimetric method (eqvIS0 3892:1980)
Enamel paints under baking
The classification of phosphate coatings according to their film weight and purpose is shown in Table 1. Table 1 Phosphate coating classification
Sub-lightweight
Lightweight
European heavyweight
0. 2 1. 0
1. 1 --4. 5
Film composition
Mainly composed of white iron phosphate, calcium phosphate or other metal phosphates
Mainly composed of zinc phosphate and (or) other metal phosphates
Mainly composed of zinc phosphate, manganese phosphate and (or) other metal phosphates
Approved for use by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on December 17, 2001 || tt||Used as coating base layer for steel workpieces with large deformation or coating base layer with low corrosion resistance requirements
Can be used as coating base layer for steel workpieces that are basically not deformed
Not used as coating base layer
2002-06-01 implementation
4 Technical requirements
4.1 The parts to be treated shall meet the following requirements GB/T6807-2001
4.1.1 When there are special provisions, the machining, forming, welding and drilling of the workpiece shall be completed before treatment. 4.1.2 The surface quality of the workpiece shall comply with the provisions of the corresponding technical documents. 4.2 Heat treatment of workpieces
For workpieces for special purposes, stress should be eliminated before phosphating treatment and hydrogen embrittlement should be eliminated after phosphating treatment. 4.3 Pre-treatment
4.3.1 The oil, rust and scale on the workpiece surface can be treated by one or more methods. 4.3.2 After degreasing, the workpiece should not have grease, emulsion and other dirt, and its surface should be completely wetted by water. 4.3.3 After pickling, there should be no visible oxides, rust and excessive corrosion. 4.3.4 After shot blasting, there should be no missed spraying, abrasive adhesion, rust and oil stains on the workpiece, and its surface should reveal the original color of the metal. 4.4 Phosphating
4.4.1 The main application methods of phosphating can be carried out by dipping, spraying or a combination of spraying. 4.4.2 For workpieces with slight oil pollution or rust, degreasing, rust removal, phosphating and passivation should generally be used in steps. In special cases, degreasing, rust removal, phosphating and passivation can be used in combination. 4.4.3 Phosphating can be carried out in a solution with zinc, manganese, zinc calcium, alkali metals, other metals or ammonia dihydrogen phosphate as the main component. 4.4.4 The preparation, adjustment and management of the phosphating bath liquid should be carried out in accordance with the corresponding process specifications. 4.4.5 All equipment (pipes, nozzles, pumps, tanks, etc.) that come into contact with the phosphating solution should be resistant to phosphate corrosion and should not affect the performance of the phosphating solution or damage the quality of the phosphating film.
4.4.6 The phosphating film formed on the surface of the workpiece should meet the technical requirements of 4.6, 4.7, 4.8 and 4.9. 4.5 Post-treatment
4.5.1 In order to improve the corrosion resistance of the phosphate film, the phosphated workpiece after water washing can be passivated in an appropriate passivation solution, but it must not affect the adhesion of the coating.
4.5.2 After phosphating or passivating, the workpiece should generally be washed with water. In order to improve the cleaning quality of the workpiece surface, it is best to use deionized water for the final water washing.
4.5.3 After the final water washing, the workpiece can be painted after drying according to the needs of the subsequent painting, or directly painted without drying. 4.5.4 In order to prevent: 1. The surface of the workpiece is contaminated or rusted, the painting should be done as soon as possible after drying. The interval between phosphating and painting is generally not more than 161. For special processing and special workpieces, the interval time can be appropriately extended, but the surface of the workpiece during this period must not be contaminated or rusted. 4.6 Phosphate film appearance
4.6.1 After phosphating, the color of the workpiece should be light gray to gray-black or colorful, and the film layer should be densely crystallized, continuous and uniform. 4.6.2 After phosphating, the workpiece has the following conditions or any one of them, which are all allowable defects; 4.6.2.1 Slight water marks, passivation marks, whitening and dusting; 4.6.2.2 Uneven color and texture due to local heat treatment, welding and different surface processing conditions; 4.6.2.3 No phosphate film at the seam.
4.6.3 After phosphating, the workpiece has the following conditions, which are all allowable defects: 4. 6.3. 1 Loose phosphate film layer;
4.6.3.2 Rust or green spots
4.6.3.3 No phosphate film (except welds) 4.6.3.4 Severe dust on the surface.
4.7 Phosphate film weight
Determination of phosphate film weight According to the provisions of GB/T9792, the phosphate film weight should conform to the values listed in Table 1. For the conversion relationship between phosphate film thickness and film weight, refer to Appendix 13 (suggestive appendix).
4.8 Phosphate film corrosion resistance
GB/T 6807-· 2001
Inspect the corrosion resistance of phosphate film according to 5.3. After 1 hour, the base metal should not be rusted (except for edges, holes, corners and welds). 4.9 Coating corrosion resistance
Inspect the coating corrosion resistance according to 5.4. After 24 hours of neutral salt spray resistance test for zinc, manganese and zinc-calcium phosphate coatings, and after 8 hours of neutral salt spray test for iron phosphate coatings, the coating should not have blistering, shedding and rust except for the scratched parts. Certificate: The scratched part refers to the area within 0.5 mm of the width near the scratch mark. 5 Inspection method
5.1 Appearance inspection
Use visual inspection under natural light or mixed lighting conditions. The illumination of natural light shall not be less than 1001x, and the minimum lighting factor shall be 2%; the illumination of mixed lighting shall not be less than 5001x. 5.2 Method for determination of phosphate film weight
Determine the film weight according to the method specified in GB/T9792. 5.3 Phosphate film corrosion resistance inspection
Phosphate test specimen (which has been cooled to room temperature) is immersed in 3% sodium chloride (NaCl) aqueous solution for a short time at 15-25°C, and the specified time is maintained. Take out the test specimen, clean it, blow it, and visually inspect whether there is rust on the phosphated surface. 5.4 Test of corrosion resistance of coating film
5.4.1 Phosphate specimens treated in 4.3, 4.4 and 4.5. Prepare a 25-35μm thick white amino baking ten enamel coating specimen in accordance with HG/T2594-1994 according to the provisions of Preparation Method 3 of G13/T1765-[979] for testing. 5.4.2 After the coating specimens are prepared, cut the coating film into 1 mm long using the cutting tool recommended by GJ3/T9286. 2cm intersection of diagonals (the scratch is deep to the steel substrate, the diagonal does not penetrate the diagonal, and the end points of the diagonal are equidistant from the diagonal). Take three specimens, with the scratched side facing up, and then place the coating specimens in a salt spray test chamber that complies with GB/T1771, and test continuously under the test conditions specified therein. 5.4.3 During inspection, take out the specimens, rinse off the salt accumulated on the surface of the specimens with white water, blow quickly with cold air for 1 minute (or absorb with a towel or filter paper), and visually inspect the surface of the specimens.
6 Acceptance rules
6.11. Quality inspection of phosphating parts includes inspection of phosphating film appearance, phosphating film weight, phosphating film corrosion resistance and coating corrosion resistance. When the entire phosphating workpiece cannot be inspected due to quantity, size and shape, the sample should be made according to one of the following methods: 6.1.1 Cut a part from the actual workpiece:
6.1.2 Prepare a sample with a size of 70mm×150mm using the same material as the workpiece and process it at the same time as the workpiece. 6.2 Appearance inspection shall be in accordance with the following provisions:
6.2.1 Large workpieces and important workpieces shall be 100% inspected and accepted one by one. 6.2.2 General workpieces (including small workpieces) shall be inspected and accepted according to GB/T2828. The inspection rules are shown in Appendix A (Appendix to the standard). 6.3 When measuring the weight of the phosphate film, if the average value of a parallel sample is not qualified, then three more samples shall be taken for re-testing. If the average value is still unqualified, the batch of products shall be unqualified. 6.4 When testing the corrosion resistance of the phosphate film, three samples shall be taken from each batch of workpieces for testing. As long as one of them is unqualified, a double sample shall be taken for re-testing. As long as one of the re-test results is still unqualified, the inspection shall be carried out in accordance with the provisions of Article 6.6 and the result shall prevail. 6.5 The sampling inspection of the weight of the phosphate film and the corrosion resistance of the coating shall be carried out in one of the following situations: 6.5.1 Newly designed products put into production; 6.5.2 Periodic inspections specified by the enterprise; 6.5.3 Changes in equipment, process or liquid formula; 6.5.4 Other inspections deemed necessary. 6.6 When testing the corrosion resistance of the coating, if one of the three samples is unqualified, double the sample shall be taken for re-testing. As long as there is still a sample that does not meet the requirements after the re-test, the batch of products is unqualified. GB/T 6807—2001
Appendix A
(Standard Appendix)
Rules for the appearance inspection of phosphate coating
This standard applies to the appearance inspection after general phosphating. A1 The appearance inspection of phosphate coating shall comply with the relevant provisions of GJ3/T2828. A2 Defect classification: The appearance defects of phosphate coating are divided into light defects and heavy defects. The allowable defects in 4.6.2 are light defects, while the unallowable defects in 4.6.3 are heavy defects. A3 During the appearance inspection, the acceptance is generally based on the appearance color and film weight of the phosphate coating. The qualification or failure is judged by the presence or absence of heavy defects, and light defects are generally not used to judge the qualification or failure. A4 The batch inspection adopts a one-time sampling plan, and the initial inspection is a normal inspection. The defect type, qualified quality level and inspection level are shown in Table A1.
Defect type, acceptable quality level and inspection level Tai Al
Defect type
Inspection items
Acceptable quality level (AQI.)
Inspection level
No. 1. 6. 3. 1.4. 6. 3. 2.4. 6. 3. 3 Compared with 4. G. 3. 4 0. 25
A5 Relaxed inspection, stricter inspection and suspended inspection shall be in accordance with the provisions of 3.2.4.2 transfer rules in GB/T2828-1981 Appendix B
Appendix
Conversion relationship between phosphating film thickness and film weight
The conversion relationship between phosphating film thickness (μm) and film weight (g/m\) is shown in Table 131. Table B1 Conversion relationship between phosphate film thickness and film weight Thickness.um
The ratio of the weight to thickness of the sub-light phosphate film is about 1.2 The ratio of the weight to thickness of the light and heavy phosphate film is about 1~2.3 The ratio of the weight to thickness of the phosphate film is between 1 and 3. GB/T 6807-2001
Film weight·g/l
Copyright exclusive infringement must be investigated
Book number: 155066·1-18386
Price:2 Prepare a sample with a size of 70mm×150mm with the same material as the workpiece and process it at the same time as the workpiece. 6.2 Appearance inspection shall be carried out in accordance with the following provisions:
6.2.1 Large workpieces and important workpieces shall be 100% inspected and accepted one by one. 6.2.2 General workpieces (including small workpieces) shall be inspected and accepted according to GB/T2828. The inspection rules are shown in Appendix A (Appendix to the standard). 6.3 When measuring the weight of the phosphate film, if the average value of a parallel sample under test does not meet the requirements, three more samples shall be taken for re-inspection. If the average value is still unqualified, the batch of products shall be unqualified. 6.4 When inspecting the corrosion resistance of the phosphate film, three samples shall be taken from each batch of workpieces for inspection. As long as one of them fails, a double sample shall be taken for re-inspection. If there is still one sample that is not qualified in the re-test, the inspection shall be carried out in accordance with the provisions of Article 6.6 and the result shall prevail. 6.5 The sampling inspection of the phosphate coating quality and the corrosion resistance of the coating shall be carried out in one of the following situations: 6.5.1 Newly designed products put into production; 6.5.2 Periodic inspection specified by the enterprise; 6.5.3 Equipment, process or liquid formula changes; 6.5.4 Other inspections when necessary. 6.6 When inspecting the corrosion resistance of the coating, if one of the three samples is not qualified, double samples shall be taken for re-test. If there is still one sample that is not qualified in the re-test, the batch of products shall be unqualified. GB/T 6807—2001 Appendix A (Standard Appendix) Rules for the appearance inspection of phosphate coating This standard applies to the appearance inspection after general phosphating. A1 The appearance inspection of the phosphate film shall comply with the relevant provisions of GJ3/T2828. A2 Defect classification: The appearance defects of the phosphate film are divided into light defects and heavy defects. The allowable defects in 4.6.2 are light defects, while the unallowable defects in 4.6.3 are heavy defects. A3 During the appearance inspection, the phosphate film is generally inspected based on its appearance color and film weight. The pass or fail is judged by the presence or absence of heavy defects, and light defects are generally not used to judge pass or fail. A4 The batch inspection adopts a one-time sampling plan, and the initial inspection is a normal inspection. The defect type, qualified quality level and inspection level are shown in Table Al.
Defect type, acceptable quality level and inspection level Tai Al
Defect type
Inspection items
Acceptable quality level (AQI.)
Inspection level
No. 1. 6. 3. 1.4. 6. 3. 2.4. 6. 3. 3 Compared with 4. G. 3. 4 0. 25
A5 Relaxed inspection, stricter inspection and suspended inspection shall be in accordance with the provisions of 3.2.4.2 transfer rules in GB/T2828-1981 Appendix B
Appendix
Conversion relationship between phosphating film thickness and film weight
The conversion relationship between phosphating film thickness (μm) and film weight (g/m\) is shown in Table 131. Table B1 Conversion relationship between phosphate film thickness and film weight Thickness.um
The ratio of the weight to thickness of the sub-light phosphate film is about 1.2 The ratio of the weight to thickness of the light and heavy phosphate film is about 1~2.3 The ratio of the weight to thickness of the phosphate film is between 1 and 3. GB/T 6807-2001
Film weight·g/l
Copyright exclusive infringement must be investigated
Book number: 155066·1-18386
Price:2 Prepare a sample with a size of 70mm×150mm with the same material as the workpiece and process it at the same time as the workpiece. 6.2 Appearance inspection shall be carried out in accordance with the following provisions:
6.2.1 Large workpieces and important workpieces shall be 100% inspected and accepted one by one. 6.2.2 General workpieces (including small workpieces) shall be inspected and accepted according to GB/T2828. The inspection rules are shown in Appendix A (Appendix to the standard). 6.3 When measuring the weight of the phosphate film, if the average value of a parallel sample under test does not meet the requirements, three more samples shall be taken for re-inspection. If the average value is still unqualified, the batch of products shall be unqualified. 6.4 When inspecting the corrosion resistance of the phosphate film, three samples shall be taken from each batch of workpieces for inspection. As long as one of them fails, a double sample shall be taken for re-inspection. If there is still one sample that is not qualified in the re-test, the inspection shall be carried out in accordance with the provisions of Article 6.6 and the result shall prevail. 6.5 The sampling inspection of the phosphate coating quality and the corrosion resistance of the coating shall be carried out in one of the following situations: 6.5.1 Newly designed products put into production; 6.5.2 Periodic inspection specified by the enterprise; 6.5.3 Equipment, process or liquid formula changes; 6.5.4 Other inspections when necessary. 6.6 When inspecting the corrosion resistance of the coating, if one of the three samples is not qualified, double samples shall be taken for re-test. If there is still one sample that is not qualified in the re-test, the batch of products shall be unqualified. GB/T 6807—2001 Appendix A (Standard Appendix) Rules for the appearance inspection of phosphate coating This standard applies to the appearance inspection after general phosphating. A1 The appearance inspection of the phosphate film shall comply with the relevant provisions of GJ3/T2828. A2 Defect classification: The appearance defects of the phosphate film are divided into light defects and heavy defects. The allowable defects in 4.6.2 are light defects, while the unallowable defects in 4.6.3 are heavy defects. A3 During the appearance inspection, the phosphate film is generally inspected based on its appearance color and film weight. The pass or fail is judged by the presence or absence of heavy defects, and light defects are generally not used to judge pass or fail. A4 The batch inspection adopts a one-time sampling plan, and the initial inspection is a normal inspection. The defect type, qualified quality level and inspection level are shown in Table Al.
Defect type, acceptable quality level and inspection level Tai Al
Defect type
Inspection items
Acceptable quality level (AQI.)
Inspection level
No. 1. 6. 3. 1.4. 6. 3. 2.4. 6. 3. 3 Compared with 4. G. 3. 4 0. 25bzxz.net
A5 Relaxed inspection, stricter inspection and suspended inspection shall be in accordance with the provisions of 3.2.4.2 transfer rules in GB/T2828-1981 Appendix B
Appendix
Conversion relationship between phosphating film thickness and film weight
The conversion relationship between phosphating film thickness (μm) and film weight (g/m\) is shown in Table 131. Table B1 Conversion relationship between phosphate film thickness and film weight Thickness.um
The ratio of the weight to thickness of the sub-light phosphate film is about 1.2 The ratio of the weight to thickness of the light and heavy phosphate film is about 1~2.3 The ratio of the weight to thickness of the phosphate film is between 1 and 3. GB/T 6807-2001
Film weight·g/l
Copyright exclusive infringement must be investigated
Book number: 155066·1-18386
Price:
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