Journal
CORROSION SCIENCE
Volume 52, Issue 10, Pages 3271-3279Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.05.044
Keywords
Metal coatings; Zinc; Magnesium; Alloy; XPS
Funding
- Christian Doppler Research Association (CDG)
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Zn-Al-Mg alloy (ZM) coating provides a decisively enhanced corrosion resistance in a salt spray test according to DIN EN ISO 9227 (NSS) compared to conventional hot-dip galvanised zinc (Z) coating because of its ability to form a very stable, well adherent protecting layer of zinc aluminium carbonate hydroxide, Zn(6)Al(2)(CO(3))(OH)(16)center dot 4H(2)O on the steel substrate. This protecting layer is the main reason for the enhanced corrosion resistance of the ZM coating. Surface corrosion products on ZM coated steel consist mainly of Zn(5)(OH)(6)(CO(3))(2)center dot ZnCO(3) and Zn(OH)(2) with additions of Zn(5)(OH)(8)Cl(2)center dot H(2)O and a carbonate-containing magnesium species. (C) 2010 Elsevier Ltd. All rights reserved.
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