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In situ infrared reflection spectroscopy studies of the initial atmospheric corrosion of Zn-Al-Mg coated steel
RISE, Swerea, Swerea KIMAB.
Institut de la Corrosion.
Institut de la Corrosion.
Institut de la Corrosion.
2013 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 72, p. 54-63Article in journal (Refereed)
Abstract [en]

NaCl induced atmospheric corrosion of ZnAl2Mg2 coated, electrogalvanised (EG) and hot dipped galvanised (HDG) steel was studied using in situ infrared reflection absorption spectroscopy, XRD and SEM. Initial corrosion leads to the formation of Mg/Al and Zn/Al layered double hydroxides (LDHs) on ZnAl2Mg2, due to the anodic dissolution of Zn-MgZn2 phases and cathodic oxygen reduction on Zn-Al-MgZn2, Al-phases and on zinc dendrites. In contrast to EG and HDG, were no ZnO and Zn5(OH)8Cl2{dot operator}H2O detected. This is explained by the buffering effect of Mg and Al which inhibit the ZnO formation, reduce the cathodic reaction and corrosion rate on ZnAl2Mg2. © 2013 Elsevier Ltd.

Place, publisher, year, edition, pages
2013. Vol. 72, p. 54-63
Keywords [en]
A. Metal coatings, B. IR-spectroscopy, B. XRD, C. Atmospheric corrosion
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12816DOI: 10.1016/j.corsci.2013.03.005Scopus ID: 2-s2.0-84877036287OAI: oai:DiVA.org:ri-12816DiVA, id: diva2:973009
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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