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Atmospheric Corrosion of Zinc-Aluminum Alloyed Coated Steel inDepleted Carbon Dioxide Environments
Institut de la Corrosion, France.
Institut de la Corrosion, France.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
University of Chemistry and Technology, Czech Republic.
2018 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 165, no 7, p. C343-C353Article in journal (Refereed) Published
Abstract [en]

NaCl induced corrosion of Zn-0.2Al, Zn-5Al and Zn-55Al coated steel was investigated at low and ambient CO2 levels. Weight lossmeasurements revealed an enhancement of the corrosion of Zn-0.2Al and particularly Zn-5Al in low CO2. This was connected toan increase of surface pH in a low CO2 atmosphere promoting the formation of ZnO and layered double hydroxide for Zn-5Al. ForZn-55Al, CO2 depletion did not affect the surface pH due to the acidification effect of Al3+. Preferential dissolution of zinc richphase was observed on cross-sections, particularly in depleted CO2 experiments. Different sequences of corrosion product formationwere proposed for the different Zn-Al coatings.

Place, publisher, year, edition, pages
2018. Vol. 165, no 7, p. C343-C353
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34924OAI: oai:DiVA.org:ri-34924DiVA, id: diva2:1241382
Available from: 2018-08-23 Created: 2018-08-23 Last updated: 2019-02-05Bibliographically approved

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