Dongguan Da Ling Shan Chang Sheng processing hardware store Caution poor corrosion resistance. When the alloy composition of impurity elements such as lead, cadmium, tin and zinc alloy zipper piece exceeds the standard, resulting in deformation of the aging cast zinc alloy plate, showing the volume swell, mechanical properties, especially ductility decreased significantly, a long time or even rupture. Lead, tin, cadmium in the zinc alloy solubility is very small, and therefore become concentrated in the grain boundary of the metal shell HDMI cathode, aluminum-rich solid solution of an anode, under the water vapor (electrolyte) the presence of conditions to foster intergranular electrochemical corrosion . Casting due to intergranular corrosion and aging. Dongguan Da Ling Shan Chang Sheng processing hardware store copper effect: 1. increase the hardness and strength of the alloy; 2 to improve wear resistance of the alloy; 3 to reduce intergranular corrosion. . Hardware copper sleeve unfavorable: a copper content of more than 1.25%, the make casting dimensions and mechanical strength due to aging and changes; 2 lower alloy extensibility. Role: ① increased copper content of the alloy strength of zinc alloy zipper films, Chang Sheng Hardware (certified), zinc alloy provided by Dongguan Da Ling Shan Chang Sheng processing hardware store. Dongguan Da Ling Shan Chang Sheng processing hardware store (shop1379091614724.1688.com) is Dongguan, hardware accessories leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chang Sheng Hardware in leadership with the staff warmly welcome all inquiries negotiations to create Chang Sheng Hardware a better future.