Contribution of electrochemical dissolution during pickling of low carbon steel in acidic solutions

•Oxide layer was thermally grown on steel to reproduce industrial scale.•The contributions of chemical and electrochemical dissolution of scale were estimated.•The role of ferric ions in the pickling process is highlighted. An electrochemical cell coupled with ICP-OES chemical analysis was used to e...

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Bibliographic Details
Published inCorrosion science Vol. 82; pp. 362 - 368
Main Authors Alaoui Mouayd, A., Orazem, M.E., Sutter, E.M.M., Tribollet, B., Koltsov, A.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.05.2014
Elsevier
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Summary:•Oxide layer was thermally grown on steel to reproduce industrial scale.•The contributions of chemical and electrochemical dissolution of scale were estimated.•The role of ferric ions in the pickling process is highlighted. An electrochemical cell coupled with ICP-OES chemical analysis was used to explore the role of chemical and electrochemical reactions in pickling of low carbon steel in acidic media. Impedance spectroscopy was used to highlight scale properties. Dissolution of hematite is shown to be mainly of chemical nature, whereas the dissolution of magnetite and wüstite is both chemical and electrochemical. Initially, chemical dissolution of the scale dominated. The electrochemical reactions included oxidation of magnetite and wüstite and reduction of ferric ions formed by chemical dissolution. After the electrolyte reached the steel substrate, electrochemical dissolution of the iron was the main reaction.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2014.01.036