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Electrochemical properties of oxide scale on steel exposed in saturated calcium hydroxide solutions with or without chlorides
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB. Chalmers University of Technology, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
Chalmers University of Technology, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
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2018 (English)In: International Journal of Corrosion, ISSN 1687-9325, E-ISSN 1687-9333, Vol. 2018, article id 5623504Article in journal (Refereed) Published
Abstract [en]

The electrochemical properties of various iron oxide scales on steel exposed in saturated calcium hydroxide solutions were investigated. The iron oxide scales were manufactured by different heat treatments and grinding processes and characterized using X-ray diffraction and scanning electron microscope. The electrochemical properties of the scales were assessed by measuring the corrosion potential and using electrochemical impedance spectroscopy and potentiodynamic polarization curves. It was found that wustite and magnetite are less noble compared to hematite but are more effective as cathodic surfaces. The results show that the electrochemical properties of the mill scale can be an important contributing factor in the corrosion of steel in concrete.

Place, publisher, year, edition, pages
2018. Vol. 2018, article id 5623504
Keywords [en]
Chlorine compounds, Electrochemical corrosion, Electrochemical impedance spectroscopy, Electrochemical properties, Hematite, Hydrated lime, Lime, Magnetite, Scale (deposits), Scanning electron microscopy, Calcium hydroxide solution, Cathodic surfaces, Contributing factor, Corrosion of steel in concretes, Corrosion potentials, Grinding process, Iron oxide scale, Potentiodynamic polarization curves, Steel corrosion
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-36784DOI: 10.1155/2018/5623504Scopus ID: 2-s2.0-85056572728OAI: oai:DiVA.org:ri-36784DiVA, id: diva2:1273763
Available from: 2018-12-21 Created: 2018-12-21 Last updated: 2018-12-21Bibliographically approved

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