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Effect of cations on corrosion of zinc and carbon steel covered with chloride deposits under atmospheric conditions
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
Institute of Chemical Technology, Czech Republic.
2007 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 49, no 6, p. 2676-2693Article in journal (Refereed) Published
Abstract [en]

The effect of sodium, calcium, and magnesium chlorides deposited on zinc and carbon steel surfaces was studied under atmospheric conditions. The cations strongly affected the corrosion rate of zinc, whereas they had a significantly lower impact on the corrosion of carbon steel. The corrosivity of cations of chloride salts for zinc increased in order of Mg2+ < Ca2+ < Na+. The higher corrosion resistance of zinc treated with calcium and magnesium chlorides was connected to prevention of formation of hydrozincite during zinc exposure in wet air. It was observed that zinc weight loss and the carbonate to simonkolleite ratio in corrosion products were correlating. The principal protective effect of bivalent cations can be seen in the decrease of pH of the surface electrolyte, which was caused by hydrolysis of such cations and subsequent formation of simonkolleite that blocked the cathodic sites.

Place, publisher, year, edition, pages
2007. Vol. 49, no 6, p. 2676-2693
Keywords [en]
A. Zinc, B. IR spectroscopy, C. Atmospheric corrosion, Steel, Weight loss, Corrosion resistance, Electrolytes, Infrared spectroscopy, pH effects, Zinc, Chloride salts, Hydrozincite, Atmospheric corrosion
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-40433DOI: 10.1016/j.corsci.2006.11.004Scopus ID: 2-s2.0-34047273902OAI: oai:DiVA.org:ri-40433DiVA, id: diva2:1361290
Note

We gratefully acknowledge financial support and help of all members of the project task force: Mika Hautala (Ruukki), Fabrice Tinardon (SNCZ), Per-Erik Augustsson (SSAB), Rémy Hellouin and Martin Jourdier (Arcelor Research), Dave Francis (AkzoNobel), Michel Belladone (Sigma Coatings), Igor Flis and Bengt Ingman (Becker Industrial Coatings), and Fernando Actis (Siderar). Dan Persson of KIMAB and Mats Ström of VOLVO Car Corporation are specially thanked for valuable discussions. The authors thank Farid Samie of KIMAB, Cécile Hall of Institut de la Corrosion, and Ted Rönnevall of Metrohm Nordic AB for their experimental support.

Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-10-16Bibliographically approved

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