从阻抗谱方面研究Q235钢硅烷处理的防腐蚀效果和成膜机理的报道较少。以不同浓度（1％～7％）、不同pH值（3～5）的乙烯基三乙氧基硅烷（VTES）水解液对Q235钢进行处理，利用电化学阻抗谱（EIS）分析了硅烷膜对3．5％NaCl溶液中Q235钢的防护效果及机理，并用红外光谱与扫描电镜（SEM）分析了Q235钢表面VTES膜的分子结构及其在盐水中浸泡腐蚀后的形貌。结果表明：VTES膜能明显改善Q235钢的耐蚀性能；经5％硅烷，pH=4的水解液处理形成的VTES膜在3．5％NaCl溶液中的电荷转移电阻及膜孔电阻最大，耐蚀效果最好，在3．5％NaCl溶液中浸泡5d后仍未发生腐蚀；Q235钢表面形成的硅烷膜既存在金属表面与硅醇单体的缩合，也有硅醇单体的缩合，还有未发生交联的Si-OH基团。
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