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What Is The Effect Of Zinc Alloy Die Casting On Electroplating?

ABIS Mold Technology Co.,Ltd Updated: Jun 28, 2017

Zinc alloy die casting is a forming process of high production efficiency. Can be processed in complex shapes of structural parts, in automotive, home bathroom widely used, but zinc alloy intolerant atmospheric corrosion, must be in its appearance copper plating, chrome protective decorative coating. The substrate itself and the special form of the substrate itself have a significant impact on the plating.

1) alloy die casting material for the zinc-aluminum alloy, are active amphoteric metal. And the two metals and aluminum in the pretreatment and electroplating treatment is the most difficult, it must control the aluminum content, the general rust plating zinc alloy die casting material, aluminum content (mass fraction) should not exceed 4%, aluminum content Too high, will make the plating difficult to normal.

2) parts design should be reasonable, die casting shape should take into account the ability to cover the plating, to minimize the hole, so that water is not easy to carry the solution. Reduce the sharp corners and other parts, so that when the distribution of electricity lines evenly.

3) die casting process, die casting mold design is reasonable, so that die casting does not produce shrinkage, pinholes and loose defects, the defects will directly affect the coating adhesion.

4) die casting process, to minimize segregation phenomenon. Such as some parts of the aluminum segregation, in the degreasing, aluminum is the first to dissolve, will die in the die surface pores, pinholes and can not be washed, resulting in poor adhesion, resulting in coating peeling blistering.

5) grinding polishing process should pay attention to grasp the sense of proportion, die casting surface cooling process formed 0.05 ~ 0.1mm dense layer is very important to the plating, grinding polishing to minimize the loss of dense layer, if this layer grinding off, Exposed will be porous, and no good plating will be present on this layer.

6) The copper-nickel-chromium plating layer, which is composed of multiple plating, is a protective coating with respect to the substrate, only mechanical protection, and the zinc alloy is corroded in humid air, so it must ensure that the coating has no holes The Otherwise the corrosion product of zinc alloy will make the coating bubble. Relative to the steel parts, the coating should be thicker two, can be applied to zinc alloy die casting.

7) die castings in the die casting and machining process residues, after processing should be cleaned up as much as possible. Because the residue is a lively metal, in any process of electroplating, will react with the solution, and damage the bath, resulting in the impact of plating quality.

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