Environmental factors affecting the corrosion behaviour of reinforcing steel: I. The early stage of passive film formation in Ca(OH)2 solutions

被引：97

作者：

Abd El Haleem, S. M. ^{[1
]}

Abd El Aal, E. E. ^{[1
]}

Abd El Wanees, S. ^{[1
]}

Diab, A. ^{[1
]}

机构：

[1] Zagazig Univ, Fac Sci, Dept Chem, Zagazig, Egypt

来源：

CORROSION SCIENCE | 2010年 / 52卷 / 12期

关键词：

Steel; Steel reinforced concrete; Passivity; Passive films; ANODIC OXIDE-FILM; ELECTROCHEMICAL-BEHAVIOR; ALKALINE MEDIA; ALUMINUM; CONCRETE; IRON; INHIBITION; BREAKDOWN; GROWTH; EVOLUTION;

D O I：

10.1016/j.corsci.2010.07.035

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxide film thickening on reinforcement steel at early stage of formation is followed in naturally aerated Ca(OH)(2) solutions, recalling the natural behaviour in concrete, by measuring the open-circuit potential, E, with time up to 4 h. The final potentials, E-fin, are reached from negative values indicating oxide film growth. E varies with the Ca(OH)(2) concentration according to a straight line relationship. Oxide film thickening, at early stage of immersion, follows a direct logarithmic growth law as evident from the linear relationship between E and log t. The rate of oxide film thickening deceases by increasing the concentration and pH of the solution and by raising the temperature. The free activation energy of oxide film thickening is determined and found to be 29.28 kJ/mole, indicating that the process of oxide film growth is under diffusion control. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：3875 / 3882

页数：8

共 60 条

[1] Behavior of the copper electrode in alkaline-sulfide solutions under natural corrosion conditions [J].