430不锈钢表面GPTMS硅烷膜的自组装及其缓蚀性能

Preparation of γ-Glycidoxypropyltrimethoxysilane Self-Assembled Film on Stainless Steel Substrate and Evaluation of Corrosion Inhibition Performance of the Film

目前,对不锈钢表面硅烷自组装成膜技术及其腐蚀行为的研究较少。对430不锈钢作2种不同前处理后,将其放入γ-缩水甘油醚氧丙基三甲氧基硅烷(GPTMS)自组装液中自组装成膜。采用傅里叶变换红外光谱、极化曲线和扫描电镜研究了2种前处理工艺对自组装GPTMS膜耐蚀性的影响;采用极化曲线研究了自组装时间对自组装GPTMS膜耐蚀性的影响。结果表明:不锈钢经氧化后再用硅酸钠和乙酸处理后,获得的自组装GPTMS膜更致密、具有更优异的抗腐蚀性能;组装时间为12 h时,自组装GPTMS膜抗腐蚀性能最好,此时其缓蚀效率可达82.3%,自腐蚀电位较基体正移了83 mV,自腐蚀电流密度下降了1个数量级。

430 stainless steel( denoted as 430SS) was separately pretreated with two kinds of routes,and then immersed in the solution of γ-glycidoxypropyltrimethoxysilane( denoted as GPTMS) to generate self-assembled film. The corrosion resistance of the GPTMS self-assembled film on 430SS pretreated with two different routes was compared in association with Fourier transform infrared spectrometric analysis,electrochemical measurements,and scanning electron microscopic observation. Moreover,the influence of self-assembled time on thecorrosion resistance of the self-assembled film was investigated based on measurement of polarization curves. Results showed that GPTMS self-assembled film prepared on 430SS substrate which was oxidized and then pretreated in sodium silicate solution and acetic acid was more compact and exhibited better corrosion resistance. Particularly,GPTMS self-assembled film obtained after 12 h of self-assembly possessed the best corrosion resistance, showing an inhibition efficiency of 82. 3%; and its corrosion potential positively shifted by 83 mV,and corrosion current density was reduced by over one order of magnitude.