Influence of pre-treatment on the surface composition of Al-Zn alloys |
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Authors: | M Gentile EV Koroleva GE Thompson TCQ Noakes |
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Affiliation: | a Corrosion and Protection Centre, School of Materials, The University of Manchester, P.O. Box 88, Manchester M60 1QD, UK b Daresbury Laboratory, Daresbury Science and Innovation Campus, Daresbury, Warrington WA4 4AD, UK |
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Abstract: | The influences of pre-treatments on the composition of Al-Zn alloys, containing 0.6-1.9 at.%Zn, are investigated using scanning and transmission electron microscopies, glow discharge optical emission spectroscopy and ion beam analysis. Alkaline etching, anodic alkaline etching and electropolishing result in zinc enrichments, just beneath the oxide/hydroxide films on the alloy surfaces. The enriched alloy, about 4-5 nm thick, contains zinc in solid-solution with aluminium, up to about 18 at.%. The highest and lowest enrichments are produced by alkaline etching and electropolishing respectively. For a given pre-treatment, the enrichment increases with increase in zinc content of the bulk alloy. |
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Keywords: | A Aluminium A Zinc B RBS B MEIS C Etching C Electropolishing |
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