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Ｎｙｑｕｉｓｔ图谱呈单一容抗弧，电化学阻抗明显高于在钼酸钠溶液中的；表面划伤后的修复能力增强；乙醇胺钼酸盐具有一定的氧化性，在缓蚀过程中部分Ｍｏ还原为ＭｏＯ２。讨论了乙醇胺钼酸盐的缓蚀作用机理，提出膜组成的长链螯合结构模式。
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.
参考文献
| [1] | |
| [2] | LizlovsA．Corrosion,1976,32(7):263-2682StranizkMA．Corrosion,1981,37(10):2963陈旭俊,黄惠金,蔡亚汉．金属腐蚀与防护基本教程,机械工业出版社,1988,p2664陈旭俊,陈振家,谢水海．中国腐蚀与防护学报,1992,12(4) |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%