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Composition of corrosion products formed on Zn-Mg, Zn-Al and Zn-Al-Mg coatings in model atmospheric conditions
Institut de la Corrosion/French Corrosion Institute.
RISE, Swerea, Swerea KIMAB.
Institute of Chemical Technology in Prague.
Institut de la Corrosion/French Corrosion Institute.
2014 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 86, 231-238 p.Article in journal (Refereed)
Abstract [en]

Formation of corrosion products on hot-dip galvanised steel. (HDG), Zn-5Al, Zn-11Al-3Mg-0.2Si, Zn-16Mg and Zn-1.5Al-1.5Mg with pre-deposited NaCl was followed in humid air at 20. °C. The alloyed coatings showed an improvement in mass loss by a factor of 4-7 to HDG. Corrosion products on the alloyed coatings contained twice as much carbonates than those formed on HDG. Magnesium dissolved preferentially, and aluminium-enriched phases were the most stable. Magnesium buffered the pH at cathodic sites, thus hindering the formation of zinc oxide and inhibiting the oxygen reduction. Magnesium products at the metal/corrosion product interface might also have an inhibiting effect. © 2014 Elsevier Ltd.

Place, publisher, year, edition, pages
2014. Vol. 86, 231-238 p.
Keyword [en]
A. Metal coatings, A. Zinc, B. Weight loss, C. Atmospheric corrosion
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12800DOI: 10.1016/j.corsci.2014.05.016Scopus ID: 2-s2.0-84903449455OAI: oai:DiVA.org:ri-12800DiVA: diva2:972993
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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