十六硫醇自组装膜对Ag的防变色作用研究

doi:10.11902/1005.4537.2015.057

中国腐蚀与防护学报

2016, Vol. 36

Issue (2): 172-176 DOI: 10.11902/1005.4537.2015.057

本期目录 | 过刊浏览

十六硫醇自组装膜对Ag的防变色作用研究

鲁文晔¹,陈蝶依²,陈步荣¹(

),汤涛¹

1. 南京工业大学材料科学与工程学院南京 210009
2. 南京大学匡亚明学院南京 210023

Hexadecane-thiol Self-assembly Monolayers on Silver for Anti-tarnishing

Wenye LU¹,Dieyi CHEN²,Burong CHEN¹(

),Tao TANG¹

1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
2. Kuang Yaming School, Nanjing University, Nanjing 210023, China

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摘要:

针对Ag制品的变色问题,在Ag表面制备十六硫醇 (HDT) 自组装分子膜 (SAMs),用H₂S加速变色实验评价防变色效果,通过正交试验法得到最佳成膜工艺为：温度60 ℃,浓度0.1 mol/L,自组装时间为2 h。采用接触角测定和极化曲线、电化学阻抗、循环伏安曲线等电化学方法对膜的性能进行表征。结果表明：乙醇溶液中HDT在Ag表面形成了一层致密的自组装分子膜,具有良好的防变色效果。HDT SAMs对Ag腐蚀的阳极氧化和阴极还原均有抑制作用,膜的覆盖率为94.8%,缓蚀率达到95.9%。

关键词 ：十六硫醇, 自组装膜, Ag, 防变色

Abstract：

Self-assembly monolayers of hexadecane-thiol (HDT) were prepared on the surface of silver and their anti-tarnishing performance was examined by accelerated tarnish test with H₂S. Then the optimal processing parameters were acquired: the temperature is 60 ℃, the concentration of HDT is 0.1 mol/L and the experiment time is 2 h. The self-assembly monolayers were characterized also by means of water drop contact angle, polarization curve, electrochemical impedance spectroscopy and cyclic voltammetry methods. The results showed that the self-assembly monolayers of HDT on the surface of silver were compact, and the effect of anti-tarnishing for silver is excellent. Both anodic and cathodic reactions of corrosion were inhibited by HTD SAMs, the film coverage is 94.8%, and the inhibition efficiency is up to 95.9%.

Key words： hexadecane-thiol self-assembly monolayer silver anti-tarnishing

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引用本文:

鲁文晔,陈蝶依,陈步荣,汤涛. 十六硫醇自组装膜对Ag的防变色作用研究[J]. 中国腐蚀与防护学报, 2016, 36(2): 172-176.
Wenye LU, Dieyi CHEN, Burong CHEN, Tao TANG. Hexadecane-thiol Self-assembly Monolayers on Silver for Anti-tarnishing. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 172-176.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.057 或 https://www.jcscp.org/CN/Y2016/V36/I2/172

表1 正交实验结果

图1 Ag表面形成HDT自组装膜前后的宏观照片

图2 Ag表面的接触角测试结果

图3 Ag表面形成HDT自组装膜前后在0.05 mol/L Na2S溶液中的极化曲线

表2 由图3计算得到的极化曲线分析结果和缓蚀效率

图4 Ag电极形成SAMs前后在0.05 mol/L Na2S溶液中的Nyquist图

图5 Ag电极表面形成SAMs前后的电化学阻抗等效电路图

表3 等效电路分析结果和表面覆盖度

图6 空白和自组装膜覆盖的Ag电极的循环伏安曲线

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