Abstract
The effect of chloride concentration on the passivity breakdown of carbon steel in deaerated pH = 13.5 alkaline solution was investigated. The results show that chloride plays an important role for the pitting corrosion of carbon steel. When NaCl the carbon steel is passive but for NaCl < 2 the carbon steel transfers from passive to passivity breakdown. When NaCl passive film breakdown occurs and the passivity breakdown potential (E b ) of carbon steel is linearly-dependent on the logarithm of the chloride activity in the alkaline solution. As predicted by the PDM, the near-normal distribution of is well indicated by the near straight line in the cumulative distribution probability. The analysis in this study gives us a method to calculate the of carbon steel in alkaline solution and its distribution for any given chloride concentration.
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