black phosphated

Black phosphated are usually coated with electroplating, hot-dip galvanizing and, more commonly, three mechanical coatings. Let it form a uniform protective layer on the surface of the combination screw to play a protective role. As we can see, post-processing improves the aesthetic. It has been greatly improved, not only high temperature resistance, but also the anti-corrosion performance of the above has been greatly improved. Therefore, the working range of the combination screw has been greatly expanded, and the adaptability is also very strong.

1. the black phosphated is electroplated. This process is to electroplate the metal-containing place with the combined screw aqueous solution, and then energize through electroplating metal electroplating. It can be selected according to needs. The demand analysis during the selection process can be closely connected with the wire.

2. mechanical galvanizing, which mainly uses metal powder to produce a coating through a combination of physical and chemical methods.

3. The temperature of hot-dip galvanizing, passivation combined with the partially melted zinc bath of the screw coating is about 510°C. This coating can improve the performance of high-strength bolts and has been favored by many fastener companies.