Phosphating solution is used to produce phosphating and phosphating film for steel wire rod. Iron and steel phosphating is mainly used for corrosion protection and paint base film.
1. Phosphating film for corrosion protection
① Phosphating film is used for corrosion protection of steel parts. The phosphating film can be used in zinc and manganese systems. The mass of the membrane unit area is 10-40 g / m2. After phosphating, apply rust proof oil, anti rust grease, anti rust wax, etc.
② Phosphating film for the bottom of paint
Increase adhesion and protection between paint film and steel workpiece. The phosphating film type can be zinc system or zinc calcium system. The unit area mass of phosphating film is 0.2-1.0 g/m2 (for the base layer of large deformation steel parts); 1-5 g/m2 (for the base layer of general steel paint); 5-10 g/m2 (for the paint base of steel parts without deformation).
2. Phosphating film for cold working lubrication
The film weight of steel wire and welded steel pipe is 1-10 g/m2 per unit area; that of precision steel pipe is 4-10 g/m2; the film weight on the unit area of cold extrusion forming of steel parts is greater than 10 g / m2.
3. Phosphating film for friction reduction
Phosphating film can reduce friction. Generally, manganese phosphating is used, and zinc phosphating is also available. For the workpiece with small dynamic fit clearance, the phosphating film quality is 1-3 g/m2; for the workpiece with large dynamic fit clearance (gearbox gear), the phosphating film quality is 5-20 g/m2. (4) Phosphating film for electrical insulation
Zinc phosphating is generally used. It is used for phosphating of silicon chips in electric motors and transformers.