JB/T 6977-1993 "Anti-rust pretreatment of mechanical products, cleaning technical conditions" is a mechanical industry standard, which stipulates the cleaning technical requirements for anti-rust pretreatment of mechanical products. The content covers cleaning objects (oil stains, rust, chips and other impurities on the surface of metal parts), cleaning methods (solvent cleaning, alkali cleaning, mechanical cleaning, etc.) selection and operation specifications, cleaning mass grades (divided by the degree of residual impurities on the surface) and detection methods (visual inspection, wiping method, water film continuous method, etc.). This standard applies to the surface cleaning of mechanical products before anti-rust treatment such as painting and Eletroplating. It ensures the surface cleanliness of the substrate through standardized cleaning process, improves the adhesion and protection effect of subsequent anti-rust coatings, and provides technical basis for the pre-treatment process design, production and quality control of mechanical products. Help to ensure the anti-rust performance and service life of the whole machine.