The comprehensive anti-corrosion skills of stainless steel pipe fittings are even more tense. The lack of coating and corrosion products are easy to block heat exchangers and other components, which affects the heat dissipation of the vehicle.
Although the ordinary Dacromet treatment process has good anti-rust effect, it has poor adhesion to the metal surface, and the coating is easily damaged under the permanent high-speed scouring of the medium, so that the overall anti-corrosion performance of the pipe fittings is significantly reduced.
The comprehensive anti-corrosion technique of connecting multiple anti-corrosion treatments on the surface of metal pipe fittings. The metal pipe fittings that need to be disposed of are sequentially carried out in the following steps: A. Degreasing and rust removal; B. Zinc and chromium coating; C. The top layer is closed;
Prior to the B step, a compound phosphating treatment was performed. This anti-corrosion technique is based on the zinc-chromium coating. Aiming at the advantages and disadvantages of the zinc-chromium coating and the special features of the layout and application of the water system pipe fittings, it adopts the comprehensive "composite phosphating + zinc-chromium coating + top closure" The new anti-corrosion technology makes the resulting composite coating have the characteristics of strong adhesion, high temperature resistance (280°C), and erosion resistance, which significantly improves the corrosion resistance of the pipeline and has a stronger connection force than the ordinary Dacromet disposal process And erosion resistance.
