自组装单分子膜防止银镀层变色因素的探讨  

Tarnish Protection of Silver Coating by Self-Assembled Monolayer and Exploration of the Ann-Tarnishing Mechanism

作　　者：郭国才[1] 

机构地区：[1]上海应用技术学院化学工程系,上海200235

出　　处：《材料保护》2009年第10期4-6,共3页Materials Protection

摘　　要：防止银镀层变色常用4种方法,但存在许多问题,自组装单分子膜防止银镀层变色效果较好。为此,用不同浓度的月桂酰肌氨酸钠溶液,在银镀层表面形成了自组装单分子保护膜。(18±1)℃下,在溶解氧饱和的3.5%NaCl溶液中,应用电化学阻抗谱评估了单分子膜防止银镀层变色的性能,阐述了单分子膜在银镀层表面的形成和防变色机理。结果表明:月桂酰肌氨酸钠浓度为0.4 g/L,浸渍时间为5.0 min时,银镀层表面能形成致密性及保护性良好的膜层。A self-assembled monolayer was prepared on silver coating by immersion in sodium N-lauroyl sarcosinate solution with different concentrations.The tarnish protection ability of the monolayer was evaluated using electrochemical impedance spectroscopy (EIS) in an air-saturated 3.5% NaCl at (18 ±1)℃.The anti-famishing mechanism of the monolaver was discussed.It was found that a densely packed monolayer with good anti-tarnishing ability was formed on the surfaceof Ag coating after being immersed in 0.4 g/L sodium N-lauroylsarcosinate solution for 5 min.

关 键 词：防变色机理 银镀层 自组装单分子膜 月桂酰肌氨酸钠 电化学阻抗谱 

分 类 号：TQ153.16[化学工程—电化学工业]