通过电化学阻抗谱、极化曲线和量子化学方法,研究了在 0 . 5 mol / L 的硫酸溶液中,咪唑、十二烷基咪唑、苄基咪唑、苯并咪唑四种缓蚀剂自组装膜对 316 不锈钢的缓蚀性能。 研究结果表明:四种缓蚀剂均为阴极型缓蚀剂,对不锈钢具有较好的缓蚀作用,在 1 X10^-3mol / L 的浓度下,随着组装时间的延长,自组装膜对不锈钢的缓蚀效率也相应增强,它们的缓蚀能力主要由最高占据轨道能 E_HOMO的大小决定,缓蚀能力由大到小依次为苯并咪唑>十二烷基咪唑>苄基咪唑>咪唑。

The corrosion inhibition action of imidazole, 1-dodecylimidazole, 1-benzylimidazole, benzimidazole self-assembled films for 316 stainless steel in 0 . 5 mol / L H₂SO₄solution was investigated by electrochemical impedance spectroscopy,polarization curves and quantum chemical calculations. Results showed that four inhibitors were all cathodic inhibitors and performed pretty inhibiting efficiency for 316 stainless steel . As the concentration of inhibitors were 1 X10^-3mol / L,the longer the assembled time,the better the effect of inhibition. The inhibition efficiency of the four inhibitors was up to the value of E_HOMO. The inhibition efficiency of the four inhibitors decreased as follows:benzimidazole>1-dodecylimidazole>1-benzylimidazole> imidazole.