Protective: phosphate film can isolate the metal from oxygen and moisture in the air, preventing the metal from corrosion. Adhesion: phosphate film can improve the adhesion of paint film, so that the paint film more firmly attached to the metal surface. Lubrication: In the process of metal cold working, phosphating film can play the role of friction reduction and lubrication, reduce friction and w
Phosphating Process
Author: Robby
The main purpose of phosphating is to provide protection for the base metal to prevent corrosion of the metal; used for priming before painting, 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.
Phosphating process
Pre-treatment: the metal workpiece to be treated for cleaning and degreasing treatment to ensure that the surface is free of oil, rust and other impurities.
Phosphate treatment: the cleaned workpiece immersed in an acidic solution containing dihydrogen phosphate, a chemical reaction occurs to generate a layer of stable insoluble phosphate film layer, i.e. phosphate film. The main purpose of the phosphate film is to increase the adhesion of the coating film, improve the corrosion resistance of the coating. Phosphating method has a variety of methods, according to the temperature of phosphating to points, can be divided into high temperature phosphating, medium temperature phosphating and low temperature phosphating.
Post-treatment: after phosphating the workpiece needs to be cleaned and dried to remove the residual phosphating solution and moisture on the surface.
The characteristics and application of phosphating film
Phosphate film has the following characteristics:
Protective: phosphate film can isolate the metal from oxygen and moisture in the air, preventing the metal from corrosion.
Adhesion: phosphate film can improve the adhesion of paint film, so that the paint film more firmly attached to the metal surface.
Lubrication: In the process of metal cold working, phosphating film can play the role of friction reduction and lubrication, reduce friction and wear.
Phosphate treatment is widely used in automotive, shipbuilding, machinery manufacturing and other industries, mainly used to improve the corrosion resistance of the workpiece and decorative.