Corrosion Resistance Analysis of Pure Silver Coating Prepared by Magnetron Sputtering and Electroplating
WANG Fusheng1, WANG Hansen2, HE Peng1, HU Longwei3, CHEN Yajun1
1 Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China 2 Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China 3 Guizhou Aerospace Precision Co.,Ltd.,Zunyi 563000, Guizhou, China
Abstract: In order to study the influence of magnetron sputtering and electroplating on the corrosion resistance and corrosion resistance mechanism of pure silver coatings. SEM, XRD, laser confocal microscopy and Zeiss microscopy were used to characterize the coating micro-morphology, phase composition, surface roughness and porosity of the coating, and the corrosion resistance of the pure silver coating was compared by salt spray corrosion test and electrochemical test. The results showed that the magnetron sputtering pure silver coating has a fine and compact granular structure, with better thickness uniformity and a columnar crystal growth pattern, while the electroplating pure silver coating has a rough structure with a ravine undulating distribution and poor flatness, the former having better crystallinity. The roughness of pure silver coating obtained by magnetron sputtering decreased by 22.5% compared with that of electroplated pure silver coating, and the porosity of pure silver coating obtained by magnetron sputtering decreased to 0.26%. After 192 h salt spray corrosion, the magnetron sputtering silver coating showed no obvious corrosion marks, and it still showed a bright white luster. Obvious corrosion spots can be seen on the electroplated pure coating after 24 h corrosion, and the electrochemical test showed that the corrosion current density of magnetron sputtering pure silver coating decreased by 48.3% compared with that of the eletroplating pure silver coating. The difference in corrosion resistance is mainly due to the collision of high-energy particles during magnetron sputtering, which makes the silver particles accumulate more closely on the substrate surface and blocks the corrosion channel to some extent. At the same time, the sputtering particles have strong migration ability on the deposition surface and are more likely to form the crystal structure with low defects. The lower roughness and porosity makes the actual contact area between magnetron sputtering pure silver coating and the corrosive medium smaller in the corrosion environment, so it has better corrosion resistance than the plating silver coating.
王付胜, 王汉森, 何鹏, 胡隆伟, 陈亚军. 磁控溅射和电镀方法制备纯银镀层耐蚀性能分析[J]. 材料导报, 2022, 36(6): 20120254-6.
WANG Fusheng, WANG Hansen, HE Peng, HU Longwei, CHEN Yajun. Corrosion Resistance Analysis of Pure Silver Coating Prepared by Magnetron Sputtering and Electroplating. Materials Reports, 2022, 36(6): 20120254-6.
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2022, Vol. 36 
