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当前位置:首页-News-Common knowledge of metal pretreatment

Common knowledge of metal pretreatment

2018/08/17

Phosphating of steel

Phosphating is the metal phosphate treatment, which is a process of forming a phosphate chemical conversion film through chemical and electrochemical reactions. The phosphate conversion film formed is called a phosphating film.

The main purpose of phosphating: one is to provide protection for the base metal to prevent the metal from being corroded to a certain extent; the other is to use as a primer before painting to improve the adhesion and anti-corrosion ability of the paint film layer; the third is to cold process the metal It plays the role of friction reduction and lubrication in the process.

Put the metal into a phosphate solution containing manganese, iron, and zinc for chemical treatment, so that the surface of the metal forms a phosphate protective film that is hardly soluble in water, that is, a phosphate film. The phosphating film layer has a microporous structure, which is firmly bonded to the substrate, and has good adsorption, lubricity, corrosion resistance, non-adhesion to molten metal (Sn, Al, Zn), and high electrical insulation.

Phosphating film is mainly used as the bottom layer of paint, the lubricating layer during metal cold working, the protective layer of metal surface, and the insulation treatment of silicon steel sheet of motor, and the anti-sticking treatment of die casting mold. The thickness of the phosphating film is generally 1um-20um. The equipment required for phosphating treatment is simple, convenient to operate, high in production efficiency and low in cost.

Widely used in industrial production of automobiles, ships, aerospace, machinery manufacturing and home appliances.

Classification of phosphonium

There are many classification methods for phosphating. Generally, they are classified according to the phosphating film-forming system, the thickness of the phosphating film, the temperature of the phosphating, and the type of accelerator. They can also be classified according to the material.

According to the phosphating film system, it is classified into six categories: zinc series, zinc calcium series, zinc manganese series, manganese series, iron series, and amorphous phase iron series.

According to the thickness of phosphating film (phosphating film weight), it is classified into four types: sub-lightweight, light-weight, sub-weight, and heavy.

According to the phosphating temperature, it is divided into four categories: normal temperature, low temperature, middle temperature and high temperature.

According to the types of accelerators: nitrate, nitrite, chlorate, organic nitride, and molybdate.

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