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June 05,2024    533     admin

Metal corrosion has always been a common problem in metal materials. Metal recycling can reduce some of the losses caused by corrosion, but about 10% of metal materials are still scrapped every year. Corrosion can cause the invalidation of metal materials and result in significant economic losses. In 2023, the economic losses caused by metal corrosion in China reached 500 billion RMB. Worldwide, the economic losses caused by corrosion exceed imagination. The losses caused by corrosion should not be calculated solely based on the mass of metal loss, but should include the energy consumed during metal smelting and recovery. At the same time, corrosion can also cause environmental pollution, such as polluting people's land and water resources. Corrosion can also cause damage to equipment, buildings, and other facilities, ranging from economic losses to endangering personal safety. Many accidents are directly or indirectly caused by corrosion. Therefore, the research on metal corrosion prevention is of great significance.

At present, research on metal corrosion prevention is mainly divided into two categories: metal alloying and metal surface treatment. Metal alloying is the process of melting protected metals together with special metals, and improving their corrosion resistance through passivation of special metals. There are many methods for surface treatment of metals, including electroplating, chemical plating, mechanical plating, surface coating, etc. Electroplating technology has the advantages of simple process, easy control of process parameters, and low cost, and is widely used in metal corrosion prevention.

In electroplating technology, zinc coating(galvanizing) is widely used as an anode material because the standard potential of zinc electrodes is low, which can provide good protection for cathode materials. However, untreated galvanized layers are prone to oxidation and corrosion in humid environments. Therefore, surface passivation treatment is required after electroplating to improve the corrosion resistance of the galvanized layer. Since the last century, people have conducted a lot of research on anti-corrosion technology, and the electroplating technology has developed rapidly. This article elaborates and summarizes the electroplating technology.

Zn2++2e → Zn

According to the type of plating solution, electroplating methods can be divided into four types: cyanide electroplating, zincate electroplating, chloride electroplating, and sulfate electroplating.

25μm zinc coating

1.3 Summary

Currently, the most widely used anti-corrosion technology for steel is still galvanizing. The production of steel products using zinc based and zinc aluminum alloy coatings for surface protection has reached over 40% of the annual steel production in developed countries.