【正文】 black passive films mixed with white or red color. Other defects excluded in item 0.. Coating Thickness1) Thickness inspection should be performed on parts. All parts should be tested (random inspection can be used for barrelplating parts with a proportion in accordance with the ISO 4519).2) Inspection should be performed according to the ISO 2178. For an area of the part surface reachable by a ball with 20 mm in diameter, the average thickness should be 8–12 μm. The minimum thickness of the lowest potential area, such as inside a trough, may be more than 5 μm. Thickness is not required for an area unreachable by a ball with 20 mm in diameter.3) For parts with screw threads, coating thickness should be enough to protect threads. It should meet requirements specified in drawings or the ISO 4042, as shown in Table 2. Thickness inspection should be performed according to the ISO 4042.4) If controversy over the inspection result occurs, arbitration test should be performed according to the ISO 1463.Table 2 Requirements for coating thickness of screw threadsNominal Diameter of Screw Thread (mm)? 3–8 10–12 14–22Coating Thickness of Screw Threads (μm)3 5 8 10. Bonding Strength1) The test should be conducted 24 hours after and within three days upon the pletion of plating. At least one sample part (see section 0for sample part requirements) or sample from each production batch should be tested.2) The passive film or coating should not fall off when you scratch 100 grids of 1 mm on a sample or sample part and pull the grids with standard adhesive tapes according to the test method of the ISO 2409. Otherwise, parts of this production batch are inpliant.3) This item is not required for thread fasteners and zinc base alloy parts after passivation.. Corrosion Resistance1) Corrosion resistance test should be performed on the parts.2) The test should be conducted 24 hours after and within three days upon the pletion of plating. At least one sample from each production batch should be tested.3) For galvanized color passive films, perform a neutral salt fog test for 72 hours according to the IEC 60068211. A sample should be free of white, black or red brown corrosion points on its surface 5 mm or farther away from its edges. Otherwise, parts of this production batch are inpliant.16 / 164) For galvanized black passive films or zinc base alloy passive films, perform a neutral salt fog test for 48 hours according to IEC 60068211. A sample should be free of white or black corrosion points on its surface 5 mm or farther away from its edges. Otherwise, parts of this production batch are inpliant.5) For small barrel plating parts, such as fasteners, at least five samples from each production batch should be tested. Perform a test according to requirements specified in 3). Few black dots on less than a half of samples are acceptable, but no white corrosion is allowed. Otherwise, parts of this production batch are inpliant. Screw threads and pression positions of fasteners are not tested.6) Corrosion resistance test is not required for partially powdersprayed parts.7) Requirements for corrosion resistance for part surfaces only with silkscreen on coatings are the same as those in item 0.8) If a part is too large to put into a test box, typical structures of the part can be used as samples.. Coating Embrittlement1) At least three samples from each production batch should be tested.2) Put samples in a thermostatic heating oven at 180–200?C for –1 hour. Take out them for natural cooling. The coating should be free of bubbling or falling. Otherwise, parts of this production batch are inpliant.3) This item is no。). Uneven color or gloss on the same part due to different surface conditions. Slight roughness on edges or ends of plex parts, large parts, and overlong parts (roughness should not affect assembly). Unobvious dark or whity welding seams or lap joints, and partial repair in accordance with requirements for appearance (see ). Falling (in white) of passive films and black spots (less than three positions and smaller than 4 mm178。 loose and powdering passive films, and obvious mark of passive solution。 process documents should specify their process equipment, process flow, and quality assurance measures.Manufacturers39。DefinitionTerm DefinitionAverage thickness Arithmetic mean value of thicknesses of ten evenly distributed points on one surface.Primary apparent surfaceVisible surface within the normal visual range after assembly of a plete product with parts.10 / 16Term DefinitionProduction batch Sum of parts with similar materials and shapes processed under the same conditions on the same day.Standard adhesive tape Adhesive tape specifically for testing adhesion of surface coatings. The adhesion on the surface of metal or anic coating is not less than 10177。7 / 16TABLE OF CONTENTS1. REQUIREMENTS FOR PROCESS AUTHENTICATION......................................................12. GENERAL PRINCIPLES.......................................................................................................12. REQUIREMENTS FOR PRODUCTION EQUIPMENT AND RAW MATERIALS ................................12 Requirements for Water Quality of Production Line ...............................................12 Requirements for Chemical Raw Materials ..............................................................12 Inspection Methods.......................................................................................12. PROCEDURES FOR PROCESS QUALIFICATION.....................................................................12. TEST AND SAMPLE REQUIREMENTS FOR PROCESS QUALIFICATION ....................................13 Sample Requirements ................................................................................................13 Test Items and