The inhibition of pit nucleation and growth on the passive surface of iron in a borate buffer solution containing Cl- by oxidizing inhibitors

被引:68
作者
Fujioka, E
Nishihara, H
Aramaki, K
机构
[1] Department of Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama
关键词
low alloy steel; polarization; pitting corrosion; repassivation; neutral inhibition;
D O I
10.1016/S0010-938X(96)00075-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The inhibiting effects of oxidizing oxyanion inhibitors on pit nucleation and growth were investigated for a passivated iron electrode in an aerated borate buffer solution containing Cl- at pH 8.49 by polarization measurements. The pitting potential E(pit) and the repassivation potential E(rep) were shifted towards positive potentials by the addition of MoO42-, WO42- and NO2-, indicating suppression of pit nucleation and propagation. CrO42- and VO3- suppressed pit nucleation but stimulated pit growth. The value of E(rep) was increased in the presence of NO3-, whereas little effect on E(pit) was obtained. The inhibition of pit nucleation and propagation with the oxidizing inhibitors is understandable from consideration of a hard acid-hard base interaction based on the hard and soft acids and bases principle. Copyright (C) 1996 Elsevier Science Ltd
引用
收藏
页码:1915 / 1933
页数:19
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