Investigation of artificial pit growth in carbon steel in highly alkaline solutions containing 0.5M NaCl under oxic and anoxic conditions

Danyil Kovalov; Elmira Ghanbari; Feixiong Mao; Bruno Kursten; Digby D. Macdonald

doi:10.1016/j.electacta.2019.07.065

Investigation of artificial pit growth in carbon steel in highly alkaline solutions containing 0.5M NaCl under oxic and anoxic conditions

Danyil Kovalov, Elmira Ghanbari, Feixiong Mao, Bruno Kursten, Digby D. Macdonald

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Abstract

We report an investigation of artificial pit growth (APG) in P355QL2 Grade Carbon Steel in the highly alkaline, synthetic concrete pore solution [sat. Ca(OH)2/NaOH of pH of 13.5] þ 0.5 M NaCl under both “oxic” and “anoxic” environmental conditions. The corrosion potential of the external surface, as well as the coupling currents flowing between the external surface and the pit tip and pit walls of the segmented
carbon steel specimens under the selected conditions, were measured as a function of time and pit aspect ratio. The findings were interpreted in terms of the Differential Aeration Hypothesis (DAH).

Original language	English
Article number	134554
Pages (from-to)	1-8
Number of pages	8
Journal	Electrochimica Acta
Volume	320
DOIs	https://doi.org/10.1016/j.electacta.2019.07.065
State	Published - 10 Oct 2019

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title = "Investigation of artificial pit growth in carbon steel in highly alkaline solutions containing 0.5M NaCl under oxic and anoxic conditions",

abstract = "We report an investigation of artificial pit growth (APG) in P355QL2 Grade Carbon Steel in the highly alkaline, synthetic concrete pore solution [sat. Ca(OH)2/NaOH of pH of 13.5] {\th} 0.5 M NaCl under both “oxic” and “anoxic” environmental conditions. The corrosion potential of the external surface, as well as the coupling currents flowing between the external surface and the pit tip and pit walls of the segmentedcarbon steel specimens under the selected conditions, were measured as a function of time and pit aspect ratio. The findings were interpreted in terms of the Differential Aeration Hypothesis (DAH).",

keywords = "Artificial pit growth, Pitting corrosion, Polarity reversal, Carbon steel, Supercontainer",

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T1 - Investigation of artificial pit growth in carbon steel in highly alkaline solutions containing 0.5M NaCl under oxic and anoxic conditions

AU - Kovalov, Danyil

AU - Ghanbari, Elmira

AU - Mao, Feixiong

AU - Kursten, Bruno

AU - Macdonald, Digby D.

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N2 - We report an investigation of artificial pit growth (APG) in P355QL2 Grade Carbon Steel in the highly alkaline, synthetic concrete pore solution [sat. Ca(OH)2/NaOH of pH of 13.5] þ 0.5 M NaCl under both “oxic” and “anoxic” environmental conditions. The corrosion potential of the external surface, as well as the coupling currents flowing between the external surface and the pit tip and pit walls of the segmentedcarbon steel specimens under the selected conditions, were measured as a function of time and pit aspect ratio. The findings were interpreted in terms of the Differential Aeration Hypothesis (DAH).

AB - We report an investigation of artificial pit growth (APG) in P355QL2 Grade Carbon Steel in the highly alkaline, synthetic concrete pore solution [sat. Ca(OH)2/NaOH of pH of 13.5] þ 0.5 M NaCl under both “oxic” and “anoxic” environmental conditions. The corrosion potential of the external surface, as well as the coupling currents flowing between the external surface and the pit tip and pit walls of the segmentedcarbon steel specimens under the selected conditions, were measured as a function of time and pit aspect ratio. The findings were interpreted in terms of the Differential Aeration Hypothesis (DAH).

KW - Artificial pit growth

KW - Pitting corrosion

KW - Polarity reversal

KW - Carbon steel

KW - Supercontainer

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DO - 10.1016/j.electacta.2019.07.065

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JO - Electrochimica Acta

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