期刊
APPLIED SURFACE SCIENCE
卷 252, 期 18, 页码 6179-6194出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2005.08.025
关键词
anodic polarization; aggressive anions; pitting corrosion; passivation
The effects of Cl-, NO3- and SO42- aggressive anions on the corrosion and passivation behavior of carbon steel electrode in deaerated 0.50 M NaHCO3 solutions were studied using potentiodynamic anodic polarization and SEM techniques. It was found that the presence of Cl-, NO3- and SO42- anions stimulates the anodic dissolution rate in both the active and the pre-passive potential regions. Moreover, significantly great effects were observed in both the passive and the trans-passive potential regions. Pitting corrosion was observed only in the presence of Cl- anions, while the presence of NO3- and SO42- anions facilitate only passivation by oxygen of water without themselves participating in the cathodic process. Also, it was observed that the effect of NO3- anion, which is a strong oxidizing agent acting primarily as stimulator of the cathodic process and then its reaction product acts indirectly retarding the anodic process. On the other hand, the effect of SO42- anion, which is a non-oxidizing agent, exerts an indirect effect on the cathodic reaction increasing its rate and then directly influence on the anodic reaction, retarding it. (c) 2005 Elsevier B.V. All rights reserved.
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