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Chemistry of corrosion products on Zn-Al-Mg alloy coated steel |
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| Authors: | S Schürz GH Luckeneder P Mack AC Kneissl |
| Affiliation: | a Christian Doppler Laboratory of Localized Corrosion, Department of General, Analytical and Physical Chemistry, University of Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria b voestalpine Stahl GmbH, Research and Development, voestalpine-Straße 3, A-4021 Linz, Austria c Thermo Fisher Scientific, The Birches Industrial Estate, Imberhorne Lane, East Grinstead, West Sussex, RH19 1UB, United Kingdom d voestalpine Stahl GmbH, Environmental and Operating Analysis, voestalpine-Straße 3, A-4021 Linz, Austria e Department of Physical Metallurgy, University of Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria |
| Abstract: | 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, Zn6Al2(CO3)(OH)16·4H2O 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 Zn5(OH)6(CO3)2, ZnCO3 and Zn(OH)2 with additions of Zn5(OH)8Cl2 · H2O and a carbonate-containing magnesium species. |
| Keywords: | A Metal coatings A Zinc A Magnesium A Alloy B XPS |
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