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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.
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.
Anti-corrosion of metal parts around the engine and other high heat environments, such as heat shields, exhaust pipes, radiators, engine cylinder heads and other parts.
Anti-corrosion of various elastic parts on load vehicles, such as ring hoops, semi-circular clamps, various springs, leaf springs, etc. These parts require high strength and hardness, electroplating treatment will produce hydrogen embrittlement, such as incomplete hydrogen removal, long time to bear dynamic load is prone to tearing or corrosion fatigue, will bring safety hazards to the car driving, especially for heavy vehicles, the operating environment is relatively harsh, so the surface treatment requirements of these pieces are correspondingly high, and Dacromet coating has high corrosion resistance, high weather resistance. It is very suitable for the surface treatment of this kind of auto parts.
Anti-corrosion of various complex shaped tubes and cavities of parts on laden vehicles, such as exhaust pipes of engines, mufflers, etc. If such parts are treated by electroplating, due to the complexity of the shape of such parts and the limitations of the electroplating process, the formation of the coating is not uniform, and may even occur leakage plating, which will cause the corrosion resistance of the parts to drop sharply, directly affecting the performance and service life of automotive parts. The Dacromet process uses impregnation and other methods, there is no problem in the plating process of uniform coating ability and depth ability is not good, and Dacromet treatment solution has excellent penetration ability, in close contact with the gap can also form a good protective film, especially for the anti-corrosion of tube and cavity complex automotive parts , some assembly parts after assembled is also suitable for Dacromet treatment. In addition, Dacromet coating is not subject to the erosion of various oils, antifreeze, cleaning agents and other chemicals, chemical resistance, weather resistance are also very good, so Dacromet is very suitable for the anti-corrosion of the chassis of heavy vehicles and automotive exterior parts.
