The ISO 3768-1976 standard specifies equipment, reagents and methods for neutral salt spray test (NSS), acetic acid salt spray test (AASS) and copper accelerated acetic acid salt spray test (CASS). These test methods are used to assess the corrosion resistance performance of metal overlays in salt fog environments. The standard requires that parameters such as pH, concentration and sedimentation rate of salt fog in the test chamber are specified to ensure the accuracy of test results. Although ISO 3768-1976 provides detailed test methods and environmental conditions, it does not cover specimen size, test period and interpretation of results, which should be determined according to the specific product standard. Therefore, this standard is applicable to evaluate the salt fog corrosion resistance of metal coatings, but should not be used as a representative of corrosion resistance in Miscellaneous media or as a basis for performance comparison between different coatings.
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