1. Anti corrosion of various high toughness chassis small and medium support frames, connecting parts, exposed parts and standard parts of light truck, such as various special-shaped steel support frames, anchor bolts (including riding foot bolts, wheel anchor bolts, etc.), nuts, etc. Overseas has established that Dacromet coating should be applied to the standard parts with grade ≥ 10.9 on vehicles. Dacromet coating not only has high corrosion resistance, but also can ensure no alkali embrittlement. In the whole process of pickling, passivation and electroplating, there are some dangerous factors causing alkali embrittlement of high strength steel plate. Although hydrogen can be removed according to the heat treatment process, it is difficult to eliminate them. In the whole process of Dacromet coating, there is no need for pickling, passivation and activation, and there is no electrochemical corrosion of hydrogen evolution, which prevents the occurrence of alkali embrittlement.

2. Anti corrosion of metal products in high-temperature natural environment around automobile engine, such as heat insulation materials, exhaust pipe, heat pipe radiator, automobile engine cylinder head and other parts. The traditional passivation treatment film on the surface of hot-dip galvanized coating will be destroyed at about 70 ℃, and the corrosion resistance will drop sharply. However, the dry solid temperature of Dacromet coating is about 300 ℃, and the chromium trioxide polymer in the coating has no carboxyl group, so the coating is not easy to be destroyed at high temperature, which mainly shows excellent corrosion resistance. The parts solved by Dacromet process can be used at 250 ℃ for a long time, their appearance will not change basically, and their corrosion resistance is very strong.

3. Corrosion protection of various ductile parts on light truck, such as hoop, semicircular pipe hoop, various springs, leaf springs, etc. The compressive strength and strength of this kind of parts are high, and electroplating process will cause alkali embrittlement. If the dehydrogenation is not complete, it is very easy to tear or etch fatigue when bearing the load for a long time, which will bring safety risk to the vehicle driving. Especially for light trucks, the working environment is relatively low, so the surface treatment requirements for this kind of parts are relatively high, Dacromet coating has high corrosion resistance and aging resistance, which is especially suitable for surface treatment of this kind of auto parts.

4. Anti corrosion of various complicated die forgings and cavity parts on light truck, such as exhaust pipe and muffler of automobile engine. If this kind of parts choose electroplating process to solve, because of the complicated appearance of these parts and the limitation of electroplating, the coating produced is not symmetrical, and even it is very likely to have missed plating, which will make the corrosion resistance of products drop sharply, and immediately endanger the characteristics and service life of automobile parts. The Dacromet process uses pre immersion and other methods, so it will not have the problem of poor working ability and deep working ability in the whole process of electroplating process. Dacromet treatment solution has excellent penetration ability, and can produce excellent protective film in the close contact gap, especially suitable for the anti-corrosion of die forgings and complex automotive parts of female die, Some assembly parts are suitable for Dacromet treatment after installation. In addition, Dacromet coating is not corroded by all kinds of raw oil, automobile antifreeze, detergent and other chemicals, and has good acid resistance and aging resistance. Therefore, Dacromet is very suitable for corrosion protection of chassis and external parts of vehicles.