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Impact of hydroxide ion–chloride ion concentration ratio on crack electrochemistry

Turnbull, A.; Dickinson, E J F (2020) Impact of hydroxide ion–chloride ion concentration ratio on crack electrochemistry. Corrosion Engineering, Science and Technology, 55 (7). pp. 574-578. ISSN 1478-422X

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A model of the electrochemistry in a stress corrosion crack in a martensitic stainless steel in low-chloride containing solution has been applied to predict the impact of the hydroxide ion-to-chloride ion ratio in the bulk solution on the electrode potential and solution chemistry. Computations were undertaken for bulk chloride ion concentrations between 0.1 ppm and 1000 ppm (by mass) and bulk pH values between 6.0 and 11.5. For near-neutral pH, significant deviation of crack-tip electrochemistry from the bulk electrochemistry is predicted. However, at sufficiently alkaline conditions (approximately pH 9.5 and above) a hydroxide-dominated regime is encountered in which the precipitation of corrosion products as well as the contribution of the hydroxide ion to overall ionic conductivity ensure uniformity of potential, pH and chloride concentration within the crack.

Item Type: Article
Subjects: Advanced Materials > Corrosion
Mathematics and Scientific Computing > Modelling
Divisions: Electromagnetic & Electrochemical Technologies
Identification number/DOI: 10.1080/1478422X.2020.1765088
Last Modified: 28 Sep 2020 14:43
URI: http://eprintspublications.npl.co.uk/id/eprint/8815

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