What is the progress of new chromium-free passivation technology in the field of electro-galvanizing? Electroplating is also one of the most commonly used techniques for the corrosion protection of metals. Chromium-free passivation treatment is a chemical technology. It is the process of changing the surface of a metal or coating from an active state to a passivated state by chemical or electrochemical means. So let's take a look at the progress of the new chromium-free passivation technology in the field of electro-galvanizing.

Electrogalvanizing is currently widely used in shipbuilding industry, machinery industry, aviation, construction and many other fields.

In recent years, China's economy has developed rapidly, and galvanized steel sheets are one of the steel products with the fastest growth rate in domestic consumption.

Since the electrode potential of zinc is relatively negative, when galvanized iron and steel parts are corroded by corrosive media, zinc acts as an anode to corrode first to protect the iron matrix, so galvanizing is a simple and effective method to improve the corrosion resistance of steel.

Due to the active nature of zinc, especially in an unventilated hot and humid environment, the galvanized layer is easily corroded as an anode, forming dark gray or white loose corrosion products, which greatly weakens the corrosion resistance of the galvanized layer. Red rust will appear, thus losing the anti-corrosion effect. In order to improve the corrosion resistance of the galvanized layer, it is generally necessary to carry out an appropriate chromium-free passivation treatment on the galvanized layer to improve the thermodynamic stability of the galvanized layer in the environment.

The chromium-free passivation treatment of the galvanized layer can not only significantly improve the corrosion resistance of the galvanized layer, but also improve the decorative appearance of the galvanized parts. Therefore, the chromium-free passivation process of galvanized layer is widely used in many fields such as machinery industry, electronics industry, instrument industry and light industry.