Phosphating is a commonly used pretreatment technology, the principle should belong to the chemical conversion film treatment, mainly used in steel surface phosphating, non-ferrous metals (such as aluminium, zinc) can also be applied to phosphating. Phosphating is a chemical and electrochemical reaction to form phosphate chemical conversion film process, the formation of phosphate conversion film called phosphate film. The purpose of phosphating is mainly: to provide protection to the base metal, to a certain extent, to prevent corrosion of metal; used for painting before priming, to improve the adhesion of the paint film layer and corrosion resistance; in the metal cold working process to play the role of friction reduction and lubrication.
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