Phosphating is a process in which metal reacts with dilute phosphoric acid or acidic phosphate solution to form a certain thickness of a protective film with phosphate as the main component.
The phosphate conversion film is composed of a series of crystals of different sizes, forming a porous structure with small cracks at the junction of the crystals. This porous crystal structure makes the surface of the product corrosion resistance, adsorption and The performance of wear reduction can be improved.
Therefore, phosphate conversion membrane treatment is widely used in automobiles, ships, machinery manufacturing, aviation, aerospace and household appliances. The research on phosphating process and process is very active, mainly focusing on phosphating mechanism, phosphating additives, phosphating process conditions and multi-functional phosphating.