乙醇胺钼酸盐的缓蚀作用与机理

采用腐蚀失重指标，极化曲线，电化学交流阻抗和电离度测定、划伤电极技术和ＸＰＳ等研究了三种乙醇胺钼酸盐在Ａ３钢／去离子水体系中的缓蚀作用与机理。结果发现，三种乙醇胺钼酸盐与均有优良的缓蚀性能，均是以抑制阳极过程为主的混合型缓蚀剂；其缓蚀能力明显优于钼酸钠、对应的乙醇胺及两者的混合物，表明分子内的醇胺基团与钼酸根有明显的协同缓蚀效应；随着分子内羟乙基的增加，其缓蚀性增强。Ａ３钢在乙醇胺钼酸盐溶液中的

INHIBBITIVE EFFECT AND MECHANISM OF ETHANOLAMINE-MOLTBSATES FOR CARBON STEEL

The inhibitive effect of three ethanolamine-molybdates for carbon steel in deionized water was evaluated. Test techniques used included weight-loss, polarization curves, ionizability, scratched electrode, EIS and XPS. It was found that all three inhibitors synthesized for this purpose had pretty good inhibitive effects for carbon steel. The organic and inorganic function groups in the inhibitor molecules exhibited excellent synergistic action on corrosion inhibition. The inhibition increased with increasing number of the hydroxy-ethyl function groups in the molecules. They were mired-type inhibitors, but mainly restrained the anodic process of corrosion.Both the passivation ability of the carbon steel and the repair ability of the protective films formed on it were enhanced by ethanolamine-molybdates in the medium under study. A part of MoO was reduced to MoO2 during the formation of the films. A possible inhibitive mechanism was discussed.