Dacromet is the translation and abbreviation of DACROMET, abbreviated as Dacromet, Dacromet Rust, Dicron. The domestic name is zinc-chromium coating, a new type of anti-corrosion coating with zinc powder, aluminum powder, chromic acid and deionized water as the main ingredients. Dacromet is a process of degreasing--shot blasting-- coating-- curing-- cooling-- finished product. so that the surface of the workpiece to form a sheet of zinc powder, aluminum powder and metal chromium salt composed of silver gray anti-corrosion coating. Dacromet film, in the forming process of metal surface, the volatile material is almost all the water through the gasification,and no pollution, has been widely used in industrial developed countries, is gradually replacing the serious pollution of electroplating zinc, chromium, hot dip galvanizing, hot spray zinc, mechanical galvanizing, zinc-based alloy coating, oxidation, phosphating and other traditional surface treatment processes,fundamentally reduce the occurrence of environmental pollution, and has the advantages and characteristics incomparable to other surface treatments. The whole set of Dacromet process equipment adopts the whole process of closed circuit coating method, which revolutionizes the plating process and eliminates the pollution problems such as acid, alkali, zinc, chromium and the emission of sewage and exhaust gas produced during the plating process.
Some Dacromet contains chromium ions which are harmful to the environment and human body, especially hexavalent chromium ions which are carcinogenic. (Under the environmental protection policy, Dacromet no longer contains hexavalent chromium ions)
Anti-corrosion of small and medium-sized brackets, connectors, exposed parts and fasteners of various high-strength chassis on laden vehicles, such as various special-shaped steel brackets, bolts (including riding bolts, wheel bolts, etc.), nuts, etc. Foreign countries have clearly recommended the use of Dacromet coating to achieve anti-corrosion protection for fasteners on the car ≥ 10.9 grade, because Dacromet coating not only has high corrosion resistance, but also can ensure no hydrogen embrittlement. High strength steel has the risk of hydrogen embrittlement in the process of pickling and electroplating, etc. Although the hydrogen can be removed by heat treatment, it is difficult to remove completely. Dacromet coating process does not require pickling and activation, and there is no electrochemical reaction leading to hydrogen precipitation, which avoids the phenomenon of hydrogen embrittlement.