Investigation of artificial pit growth in carbon steel in highly alkaline solutions containing 0.5 M NaCl under oxic and anoxic conditions. (10th October 2019)

• Record Type: Journal Article
• Authors: Kovalov, Danyil; Ghanbari, Elmira; Mao, Feixiong; Kursten, Bruno; Macdonald, Digby D.
• Is Part Of: Electrochimica acta. Volume 320(2019)
• Publication Date: 2019-10-10
• Subjects: Artificial pit growth -- Pitting corrosion -- Polarity reversal -- Carbon steel -- Supercontainer; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.07.065
• Languages: English
• ISSNs: 0013-4686

Abstract

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] + 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). Highlights: The investigation of artificial pit growth in an aqueous concrete solution with a pH of 13.5. The effect of 0.5 M NaCl concentration on artificial pit growth under oxic and anoxic conditions. The negative current flowing from the pit tip as an indicator of the establishment of the cathodic region at the pit tip. The effect of the different aspect ratio of pits on their growth rate.