Exploration of the effect of chloride ion concentration and temperature on pitting corrosion of carbon steel in saturated Ca(OH)2 solution. (September 2015)

• Record Type: Journal Article
• Authors: Sharifi-Asl, Samin; Mao, Feixiong; Lu, Pin; Kursten, Bruno; Macdonald, Digby D.
• Is Part Of: Corrosion science. Volume 98(2015)
• Page Start: 708
• Page End: 715
• Publication Date: 2015-09
• Subjects: Passivity breakdown -- The point defect model -- Carbon steel -- Pitting corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.06.010
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The localized corrosion of carbon steel was investigated. The breakdown potential decreases as chloride concentration increases. Increase of temperature led to a decrease of localized corrosion resistance. Distribution in breakdown potential follows a near-normal distribution. Abstract: Passivity breakdown on carbon steel, has been studied and the data are interpreted in terms of the point defect model. An increase in temperature from 25 °C to 85 °C results in a decrease in localized corrosion resistance according to a linear relationship between the critical breakdown voltage, E b, and log (chloride activity) for all chloride concentrations. The linear dependence of the passivity breakdown potential on the square root of potential scan rate ( ν 1/2 ), as predicted by the PDM, yields an estimate of the critical areal concentration of condensed cation vacancies at the metal/film interface that leads to the passivity breakdown.