What should be paid attention to surface treatment in sheet metal fabrication?

1. All electrochemical treatment should be carried out in the state of the parts, because the chemical solution during the treatment process will be trapped in the crevices of the assembly and cause corrosion;

2. Spot-welded parts can be chemically treated, but not electrochemically treated;

3. Aluminum alloy castings cannot be anodized with sulfuric acid;

4. Electrochemical treatment is generally not suitable for thin and long tubular parts, because there will be no film layer on the inner surface; (special measures can be taken to meet the requirements in special cases)

Surface finishing

5. After the parts with deep grooves or fine holes are electroplated, the inner surface will not be completely covered with the coating;

6. It is best to carry out phosphating treatment before spraying the steel parts to increase the adhesion of the coating;

7. In order to improve the corrosion resistance of steel parts plated with bright nickel, copper or dark nickel can be plated first;

8. Zinc-based alloys generally use electroplating as protective decoration. In order to improve the bonding force of the coating, it is generally necessary to pre-plated copper or nickel;

9. Since most organic gases have a corrosive effect on zinc, the galvanized layer should be carefully selected in the design of sheet metal processing to be in contact with organic materials or assembled in the same closed body;

10. For electroplated parts with riveting requirements, the processing procedure must be electroplating first and then riveting.

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