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Technical development of Dacromet (zinc chrome coating)

Posted on 2018-12-28
Dacromet is the Chinese transliteration of DACROMETR, also known as zinc chrome film, Dak rust, Dakman, etc., and will be called "zinc chrome coating" in the standard of China's Dacromet. ), which is defined as: "Inorganic anti-corrosion coating with scaly zinc and zinc chromate as main components by dip coating, brushing or spraying water-based zinc-chromium coating on the surface of steel parts or components. Layer.” Dacromet technology was invented by Americans and is a metal-coating treatment similar to electro-galvanizing.

 

The Dacromet coating has a uniform silver-gray appearance and contains 80% thin zinc flakes in the coating. Aluminum sheet, the rest is chromate, has excellent performance, such as strong corrosion resistance: 7 to 10 times higher than electrogalvanizing; anaerobic brittle; especially suitable for high-strength parts, such as for subway engineering High-strength bolts; high heat resistance; heat-resistant temperature 300 °C.

 

In addition, it also has the advantages of high permeability, high adhesion, high friction reduction, high weather resistance, high chemical stability and no environmental pollution.

 

In industrialized countries, Dacromet metal surface anti-corrosion technology has been used as an anti-corrosion treatment process for many traditional processes such as electroplating, hot dip galvanizing, electroplating cadmium, zinc-based alloy plating, phosphating, etc. A new process that fundamentally reduces environmental pollution.

 

Due to its simple operation, energy saving, and low environmental pollution, Dacromet technology can avoid the advantages of traditional electroplating zinc and hot dip galvanizing technologies such as hydrogen embrittlement. Therefore, it has been widely used since the advent of the 1970s, especially in the automotive industry in developed countries such as the United States and Japan, and has been extended to construction, military, shipbuilding, railway, electric power, home appliances, agricultural machinery, mines, bridges, etc. field.