Experiments have been performed where steel specimens were exposed to undersaturated, saturated and saturated-plus-excess-solid Ca(OH)2 solutions, both aerated and deaerated and with varying amounts of chloride. Corrosion state was characterized by corrosion potential, anodic polarization scan and polarization resistance measurements. The results are discussed within the context of [Cl−]/[OH−] as the critical parameter for passive film stability. Emphasis is placed upon the presence of a solid Ca(OH)2 which formed upon steel exposed to the excess-solid solutions and the beneficial influence of this upon corrosion rate. Relevance of the results to corrosion and corrosion resistance of steel in concrete is discussed.

Subject
Films, Hydroxides, Corrosion rate, Solids, Sodium chloride, Calcium, Solid solutions, Acidity, Sodium chloride solution, Film formation, Steel, Corrosion potential, Passivity
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1990
Association for Materials Protection and Performance (AMPP)
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