Dongguan Da Ling Shan Chang Sheng processing hardware store causes: the holes caused by: mainly porosity and contraction mechanisms are often circular pores, while the majority of irregular contractions. (1) pores causes: a liquid metal in a mold filling, solidification process Guangdong zinc alloy products, due to gas invasion, leading to the casting surface or internally generated holes. b paint out of the volatile gas intrusion. c alloy liquid gas content is too high, the precipitation during solidification. When the cavity in the gas, paint volatile gases, solidification precipitation gas PRD zinc alloy die-casting, in the mold venting bad, eventually left in the pores formed in the casting. (2) shrinkage causes: a liquid metal zinc alloy solidification process, due to the volume reduction or final solidification of liquid metal parts are not feeding, and produce shrinkage. Between Dongguan Da Ling Shan Chang Sheng processing hardware store intergranular corrosion caused by: zinc alloy composition of harmful impurities: lead, cadmium, tin will gather at the junction leading to the grain intergranular corrosion, metal matrix due to intergranular corrosion and broken Zinc Alloy Europe regulation pins, while plating accelerated this scourge by intergranular corrosion coating parts will swell and the top, causing the casting surface blistering. Especially in a humid environment will intergranular corrosion casting deformation, cracking, or even broken. Zinc Alloy European regulations pins, zinc alloy, Chang Sheng Hardware provided by Dongguan Da Ling Shan Chang Sheng processing hardware store. Dongguan Da Ling Shan Chang Sheng processing hardware store (shop1379091614724.1688.com) strong, credible, in Dongguan, Guangdong and other hardware accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chang Sheng Hardware and you hand into the brilliant, for a better future!