Zinc alloy die casting is widely used in various decorative aspects, such as furniture accessories, building decoration, bathroom accessories, lighting parts, toys, tie clips, belt buckles, all kinds of metal buckle, etc., so the surface quality of casting requirements are high, and the requirements of good surface treatment performance. The most common defect of zinc alloy die casting is surface bubbling.Defect characterization: die-casting surface has protruding vesicles, die-casting is found, polishing or processing after exposure, spray or electroplating after appearance. The reasons causing: 1.Holes cause: mainly stomata and contractile mechanism, stomata are often round, and most contractile are irregular. (1)...