Environmental factors affecting the corrosion behavior of reinforcing steel II. Role of some anions in the initiation and inhibition of pitting corrosion of steel in Ca(OH)2 solutions

阅读量：

18

作者：

S.M. Abd El Haleem and S. Abd El Wanees and E.E. Abd El Aal and A. Diab

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摘要：

Potential-time curves are constructed for the steel electrode in naturally aerated Ca(OH)2 solutions simulating the corrosion behavior in concrete. Cl− and SO42− ions cause the destruction of passivity and initiation of pitting corrosion. The rate of oxide film growth by Ca(OH)2 and oxide film destruction by Cl− and SO42− ions follows a direct logarithmic law as evident from the linear relationships between the open-circuit potential and the logarithm of immersion time. Chromate, phosphate, nitrite, tungstate and molybdate ions inhibit the pitting corrosion of steel. The rate of oxide film healing and thickening increases with their concentrations. In presence of constant inhibitor concentration, the efficiency of pitting inhibition increases in the order: (weak) CrO42− ; HPO42− ; NO2− ; WO42− ; MoO42− (strong).

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关键词：

Reinforcing steel Ca(OH)2 Oxide film growth Oxide film destruction C. Pitting corrosion Inhibition

DOI：

10.1016/j.corsci.2009.09.004

年份：

2010