Zinc Alloy Defect Analysis
Various decorative aspects, such as furniture fittings, architectural decoration, bathroom accessories, lighting parts, toys, tie clips, belt buckles, various metal buckles, etc. are widely used in zinc alloy die castings. This also requires the surface quality of the casting to be high and requires good surface treatment properties. The most common defect in zinc alloy die castings is surface blistering.
Characterization of defects: There are protruding vesicles on the surface of the die casting. The main performance is: when die-casting, it will be revealed after polishing or processing, and it will appear after injection or plating.
Cause: holes cause which ia mainly because of pores and shrinkage mechanisms, the pores are often round, and the shrinkage is mostly irregular.
Reasons for stomata:
a. During the filling and solidification of the molten metal, holes are formed on the surface or inside of the casting due to gas intrusion.
b. Intrusion of gas volatilized from the paint.
c. The alloy liquid contains too much gas and precipitates during solidification. When the gas in the cavity, the gas volatilized by the paint, and the gas which is solidified by the alloy are poorly discharged in the mold, the pores formed in the casting are finally left.