What is the phosphating process?
The phosphating process is a chemical and electrochemical reaction to form a phosphate chemical conversion film. Specifically, phosphating is a method of placing metal into a phosphate solution containing manganese, iron, and zinc for chemical treatment, so that the metal surface generates a protective film of phosphate that is insoluble in water, which is known as the phosphate film. The main purpose of the phosphating process is to provide protection for the base metal to prevent metal corrosion, but also used for priming before painting to improve the adhesion of the paint film layer and corrosion resistance. In addition, the phosphide film can also play a role in the metal cold working process to reduce friction lubrication.
Phosphating process includes chemical and electrochemical reactions, different phosphating systems, different substrates phosphate reaction mechanism is relatively complex. The effective generation of phosphate film is directly related to the cleanliness of the metal surface and the surface microstructure. Therefore, before phosphating treatment, it is usually necessary to pre-treat the metal surface, such as degreasing, descaling, etc., to ensure the quality and performance of the phosphating film.
Phosphating process is widely used in the anti-corrosion treatment of fasteners, because the phosphating film formed has good corrosion resistance, adhesion and wear resistance. At the same time, the phosphating process also has the advantages of moderate cost and easy operation, so it is widely used in actual production.
It should be noted that, although the phosphating process has certain advantages in metal corrosion, but in the process of use still need to pay attention to environmental issues, to avoid pollution of the environment. In addition, with the progress of science and technology and the improvement of environmental protection requirements, there may be a more environmentally friendly and efficient metal anti-corrosion process in the future.
