Journal
SURFACE & COATINGS TECHNOLOGY
Volume 277, Issue -, Pages 91-98Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2015.07.034
Keywords
Grain features; Aluminium alloy; Anodizing; Corrosion
Funding
- EPSRC
- PTDF
- EPSRC [EP/H020047/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H020047/1] Funding Source: researchfish
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Distinct chemically and mechanically induced features, evident in the grains of the AA5083-O aluminium alloy, and their effects on anodizing and corrosion have been studied. The grain distinct features are orientation dependent and are ridge-like. These features were found after anodizing in Barker's reagent and after micro-trimming with a diamond knife (during the ultramicrotomy process). The grain features were also found to have a relationship with the anodic films formed on the alloy. Distinct striations (associated with the formation of the ridge-like features found after anodizing) were observed on the surface of the alloy after the removal of the anodic layer (using a solution containing 20 g Cr2O3 + 30 ml HPO3 in 1l of deionised water at 60 degrees C). Further etched regions, after the removal of the anodic layer, revealed subsurface micro-layers which appear to have significant influence on the corrosion, anodizing and mechanical (at micro-scale) behaviour of the alloy. (C) 2015 Elsevier B.V. All rights reserved.
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