What factors affect electroplating quality of Zinc-alloy die casting?

Date：

2021-06-08

The electroplating surface treatment of zinc alloy die casting is very important. If the electroplating is not done well, all the early work will be wasted. Therefore, we must pay attention to the electroplating process of the product. So what factors affect the electroplating quality? Please summarize as follows:

What factors affect electroplating quality of Zinc-alloy die casting?

The electroplating surface treatment of zinc alloy die castings is very important. If the electroplating is not done well, all the previous work will be wasted. Therefore, pay attention to the electroplating process of products. The factors that affect the electroplating quality are summarized as follows:

1. For the selection of raw materials for zinc alloy die castings, the standard national standard materials must be used for product die casting

2. The design of zinc alloy die castings should be reasonable. The shape of the die castings should consider the concealment ability of electroplating, and try to reduce non through-hole, which is not convenient to carry aqueous solution for washing, cut sharp corners and other parts, so that the power lines are evenly distributed during electroplating

3. The die casting process and die casting die design are reasonable, so that the die casting will not have shrinkage cavity, pinhole, looseness and other defects, which will directly affect the adhesion of the coating

4. During the production of zinc alloy die castings, segregation shall be reduced as much as possible. If aluminum segregates in some parts, aluminum will be dissolved first during degreasing, resulting in the inability to clean the pores and pinholes on the surface of the die castings, resulting in poor bonding strength, resulting in peeling and blistering of the coating

5. Pay attention to measurement during polishing. The fine layer of 0.05~0.1mm formed during cooling of die castings is very important for electroplating. The loss of fine layer shall be reduced as much as possible during grinding and polishing. If this layer is removed, porous structure will be exposed, and no good electroplating layer can be obtained on this layer

6. The copper nickel chromium plating layer composed of various plating species is a negative coating relative to the base material. As long as the mechanical maintenance is effective, the zinc alloy parts will be corroded in humid air. Therefore, it must be ensured that the coating is non porous, otherwise the corrosion products of the zinc alloy will cause the coating to bubble. Compared with the steel parts, the coating should be thicker to apply to the zinc alloy die castings

7. Die castings and residues during machining should be cleaned up as much as possible after processing. As residues are a lively metal, they will react with the solution in any electroplating process and damage the electroplating solution, thus affecting the electroplating quality


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