金属镀金外壳抗盐雾腐蚀工艺的改进
发布时间：2018-09-10 09:48
【摘要】：目的解决金属镀金外壳在Na Cl盐溶液中表面出现锈蚀、外壳引线根部断裂的问题,提高外壳的抗盐雾腐蚀能力,解决外壳镀层抗蚀性差的问题。方法以盐雾腐蚀机理为依据,利用扫描电镜对镀金外壳在盐雾环境中的腐蚀形貌进行观测,分析镀层腐蚀形貌和金属基座(可伐合金)-玻璃绝缘子(电真空玻璃)-金属引线(可伐合金)封接形貌。从4个方面对工艺进行改进:控制金属镀层与基体材料的电位差,消除腐蚀原动力;提高镀层致密性,减少镀层孔隙率;控制外壳高温封接温度,抑制缝隙腐蚀;控制金属表面镀层厚度,防止镀层与基体间形成腐蚀通道。结果针对镀金外壳在盐雾环境中的腐蚀形态以点蚀、缝隙腐蚀为主的情况,通过优化镀镍工艺、镀金工艺,避免腐蚀发生时金属外壳表面形成大面积点蚀;优化高温退火温度为800℃,高温封接温度为900℃,可以抑制金属外壳缝隙腐蚀的发生。结论优化金属外壳退火温度、高温封接温度、电镀镍和金等工艺措施,提高了金属镀金外壳抗48 h盐雾腐蚀性能。
[Abstract]:Aim to solve the problem of corrosion on the surface of the gold-plated shell in Na Cl salt solution and the fracture of the lead root of the shell, to improve the corrosion resistance of the shell and to solve the problem of poor corrosion resistance of the coating. Methods based on the corrosion mechanism of salt spray, the corrosion morphology of gold-plated shell in salt spray environment was observed by scanning electron microscope (SEM). The corrosion morphology of coating and sealing morphology of metal base (Kovar alloy)-glass insulator (vacuum glass)-metal lead (Kovar alloy) were analyzed. The process is improved from four aspects: controlling the potential difference between the metal coating and the substrate, eliminating the corrosion motive force, increasing the density of the coating, reducing the porosity of the coating, controlling the sealing temperature of the shell at high temperature and restraining the crevice corrosion; Control the thickness of the coating on the metal surface to prevent corrosion channels between the coating and the substrate. Results in view of the pitting corrosion and crevice corrosion of the gold-plated shell in salt mist environment, through optimizing the nickel plating process and the gold-plating process, the large pitting corrosion of the metal shell surface can be avoided when corrosion occurs. The optimized high temperature annealing temperature is 800 鈩，
本文编号：2234095
[Abstract]:Aim to solve the problem of corrosion on the surface of the gold-plated shell in Na Cl salt solution and the fracture of the lead root of the shell, to improve the corrosion resistance of the shell and to solve the problem of poor corrosion resistance of the coating. Methods based on the corrosion mechanism of salt spray, the corrosion morphology of gold-plated shell in salt spray environment was observed by scanning electron microscope (SEM). The corrosion morphology of coating and sealing morphology of metal base (Kovar alloy)-glass insulator (vacuum glass)-metal lead (Kovar alloy) were analyzed. The process is improved from four aspects: controlling the potential difference between the metal coating and the substrate, eliminating the corrosion motive force, increasing the density of the coating, reducing the porosity of the coating, controlling the sealing temperature of the shell at high temperature and restraining the crevice corrosion; Control the thickness of the coating on the metal surface to prevent corrosion channels between the coating and the substrate. Results in view of the pitting corrosion and crevice corrosion of the gold-plated shell in salt mist environment, through optimizing the nickel plating process and the gold-plating process, the large pitting corrosion of the metal shell surface can be avoided when corrosion occurs. The optimized high temperature annealing temperature is 800 鈩，
本文编号：2234095
本文链接：https://www.wllwen.com/kejilunwen/jinshugongy/2234095.html
教材专著
