According to the different needs of users, can use passivation treatment, phosphating, alloying treatment or coating of organic coating. Are continuously developed better passivation agent formula. The main using chromate passivation, but added fluoride and phosphoric acid as activator, thicker chromate film is achieved; When fluoride of passivation solution, can accelerate the formation of passive film, and make the passivation membrane meticulous light; In the non-toxic or low toxic inorganic corrosion inhibitors as passivator study, non-toxic water soluble acrylic acid resin added a small amount of salt molybdate and phosphate (ACM) got a passivation solution, used instead of toxic chromate passivation treatment, can delay the galvanized layer of white rust, its corrosion resistance is close to chromate passivation, although at present the technology is not very mature, but for the sake of environmental protection, chromium-free passivating replace chromate passivation is the trend of The Times. Adopt after phosphating treatment of hot dip galvanized steel sheet can replace the traditional electricity galvanized steel plate used in home appliances, it can prolong the life of products, and can reduce the cost of materials. Hot galvanizing unit online phosphating is very potential. Fingerprint resistant processing and applications of inorganic lubricating film, organic lubricating film are the hot research topic.
