Zinc Alloy Die Casting Features and Plating Discharge Problem

Zinc Alloy Die Casting Features:
1. The relative proportion is significant.
2. Casting performance is good, you can die-casting complex shape, thin-walled precision parts, casting surface smooth.
3. Can be surface treatment: electroplating, spraying, painting, polishing, grinding and so on.
4. Melting and die-casting does not absorb iron, do not corrosion pressure type, non-stick mold.
5. Have good mechanical properties at room temperature and wear resistance.
6. Low melting point, melting at 385 ℃, easy die-casting molding.

Zinc Alloy Die Casting Plating Plating Problem:
Zinc-aluminum die casting is a zinc-based die-casting parts. This part of the surface ─ ─ layer is very dense surface, which is evacuated porous structure, but also lively amphoteric metal. Therefore, only the use of appropriate pre-treatment methods and plating process, in order to ensure that the zinc alloy plating layer has a good adhesion to meet the requirements of qualified products.
Electroplating commonly used zinc alloy material ZA4-1, its main components are: aluminum 3.5% ~ 4.5%, copper 0.75% ~ 1.25%, magnesium 0.03% ~ 0.08%, the balance of zinc, impurity ≤ 0.2%. The 925 grade zinc alloy with high copper content, but also easy to plating. Usually, the density of zinc alloy is 6.4 ~ 6.5 g / cm, if the density <6.4 g / cm, after plating prone to blister and pitting. In short, the selection must be strict checks. In addition, die-casting mold must be designed to avoid plating to bring difficult to overcome the defects (such as pitting).