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Journal of Materials Engineering and Performance

Erschienen in:

21.06.2017

Effect of Surface Roughness of an Electropolished Aluminum Substrate on the Thickness, Morphology, and Hardness of Aluminum Oxide Coatings Formed During Anodization in Oxalic Acid

verfasst von: R. K. Choudhary, K. P. Sreeshma, P. Mishra

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 7/2017

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Abstract

Aluminum specimens were electropolished to five different roughness profiles and anodized in 10% oxalic acid under identical conditions in order to study the effect of surface topography on the thickness, morphology, chemical composition and hardness of the anodic aluminum oxide coatings formed. Field emission scanning electron microscopy showed that the anodic coating grown on a substrate having an average roughness of 250 nm was dense, whereas the microstructure became more porous with increasing the substrate roughness. The thickness of the coating was found to be a parabolic function of substrate roughness. Energy-dispersive x-ray analysis of coatings revealed a continuous increase in O/Al ratio with increasing substrate roughness suggesting increased incorporation of anions during oxide growth and also a tendency toward the formation of stoichiometric Al₂O₃. Coatings with higher O/Al ratio displayed improved hardness values.

Vorheriger Artikel Study on Microtexture and Martensite Formation of Friction Stir Lap-welded DP 590 Steel within A1 to A3 Temperature Range

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Titel: Effect of Surface Roughness of an Electropolished Aluminum Substrate on the Thickness, Morphology, and Hardness of Aluminum Oxide Coatings Formed During Anodization in Oxalic Acid
verfasst von: R. K. Choudhary
K. P. Sreeshma
P. Mishra
Publikationsdatum: 21.06.2017
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 7/2017
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-017-2798-0

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