采用动电位和恒电位技术研究了低碳钢在NaHCO3-NaCl体系中的点蚀电位和再钝化电位的分布以及5种阴离子对它们的影响.结果表明，点蚀电位和再钝化电位均服从正态分布；在5种阴离子中，NO2-和MoO2-4能够抑制点蚀的发生和发展，而SO2-4、NO-3在低浓度时降低点蚀电位和再钝化电位，促进点蚀的发生，在高浓度时能够破坏自钝化；Cr2O2-7能显著抑制点蚀的发生，然而点蚀一旦产生后它却能加速点蚀的发展.
The effects of anions on the pit nucleation and growth on A3steel in NaHCO3 - NaCl solutions were investigated by potentiodynamic and potentiostatic techniques. Pitting potential and repassivation potential were shifted towards positive direction by the addition of NO-2 and MoO2-4, indicating suppression of pit nucleation and propagation. Cr2O2-7 anion suppressed pit nucleation but stimulated pit growth. SO2-4, NO-3 anions stimulated both pit nucleation and propagation at low concentrations. The pitting potential and repassivation potential decreased linearly with logarithm of SO2-4 concentration. Increasing the concentrations of SO2-4, NO-3 over 0.02M changed the potential from passive to active region. Pitting potential and repassivation potential of carbon steel were found to obey normal distributions.
参考文献
| [1] | 曹家绶，陈家坚，曹殿珍等.腐蚀科学与防护技术，1991，3：25 |
| [2] | 尹德才.腐蚀与防护，1991，12：172 |
| [3] | Davies D H, Burstein G T. Corrosion, 1980,36:416 |
| [4] | Shibata T, Takeyama T. Corrosion, 1977,33:243 |
| [5] | 姜涛.碳钢孔蚀期间的电化学行为及其统计规律研究(硕士论文).北京：北京化工大学，2000. |
| [6] | Acosta C A, Salvarezza R C, Videla H A, et al. Corrosion Science,1985,25:291 |
| [7] | Fujioka E, Nishihara H, Aramaki K. Corrosion Science, 1996,38:1915 |
| [8] | 许淳淳，傅晓萍，刘幼平.腐蚀科学与防腐蚀工程技术新进展.北京：化学工业出版社，1999.157 |
| [9] | 陈旭俊，王海林，陈振家.中国腐蚀与防护学报，1992，12：213 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%