Spraying chromium can replace electroplating hard grid.

Spraying chromium can replace electroplating hard grid.

With the obvious enhancement of people's awareness of the threat of chromium plating to health and environment, it has become an inevitable trend to develop new environmental protection coating technology to replace the traditional hard chromium plating. In fact, the hardness and wear resistance of electroplated hard chromium coatings are far less than those of some ceramics or cermets. Its working temperature can only be lower than 427℃, which is difficult to adapt to the working requirements of modern machinery at high temperature and high speed. Moreover, the electroplating inner layer is prone to penetrating cracks, which will lead to matrix corrosion and even coating shedding. The existing thermal spraying technology is more efficient and cleaner than electroplating hard chromium, and the cost is basically unchanged and declining. It has great development and application prospects. One of them is. High-speed flame spraying HVO F) technology has high spraying efficiency, high bonding strength (greater than 70MPa) and low porosity (less than 65438 0%), and has become the most important alternative technology for electroplating hard chromium.