【摘要】：目的解決金屬鍍金外殼在Na Cl鹽溶液中表面出現(xiàn)銹蝕、外殼引線根部斷裂的問題,提高外殼的抗鹽霧腐蝕能力,解決外殼鍍層抗蝕性差的問題。方法以鹽霧腐蝕機理為依據(jù),利用掃描電鏡對鍍金外殼在鹽霧環(huán)境中的腐蝕形貌進行觀測,分析鍍層腐蝕形貌和金屬基座(可伐合金)-玻璃絕緣子(電真空玻璃)-金屬引線(可伐合金)封接形貌。從4個方面對工藝進行改進:控制金屬鍍層與基體材料的電位差,消除腐蝕原動力;提高鍍層致密性,減少鍍層孔隙率;控制外殼高溫封接溫度,抑制縫隙腐蝕;控制金屬表面鍍層厚度,防止鍍層與基體間形成腐蝕通道。結果針對鍍金外殼在鹽霧環(huán)境中的腐蝕形態(tài)以點蝕、縫隙腐蝕為主的情況,通過優(yōu)化鍍鎳工藝、鍍金工藝,避免腐蝕發(fā)生時金屬外殼表面形成大面積點蝕;優(yōu)化高溫退火溫度為800℃,高溫封接溫度為900℃,可以抑制金屬外殼縫隙腐蝕的發(fā)生。結論優(yōu)化金屬外殼退火溫度、高溫封接溫度、電鍍鎳和金等工藝措施,提高了金屬鍍金外殼抗48 h鹽霧腐蝕性能。
[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，

本文編號：2234095