Enhancing corrosion resistance and microstructure of the PEO coating layer on 6061 aluminium alloy: The role of first step voltage in plasma electrolytic oxidation

Authors
Oh, Geun HunYoon, Jin KookHuh, Joo YeolDoh, Jung Mann
Issue Date
2024-06
Publisher
Pergamon Press Ltd.
Citation
Corrosion Science, v.233
Abstract
In this study, a novel two-step hybrid PEO technique was used to produce an alumina(Al2O3) on an Al6061 alloy. The research emphasizes the influence of the microstructure of the initial thin layer on the amount of defects such as microcracks and micropores in the final coating. Initially, a thin alumina layer was formed at 400 ∼ 600?V using a pulsed unipolar mode, followed by a thicker layer at 500?V using a pulsed bipolar mode. The results indicate that a sound PEO coating with fewer defects markedly enhances the corrosion resistance of the Al6061 alloy.
Keywords
CU-LI ALLOY; MICROARC OXIDATION; CERAMIC COATINGS; AL-ALLOY; OXIDE-LAYERS; IMPEDANCE SPECTROSCOPY; DIELECTRIC-PROPERTIES; AA7075 ALUMINUM; GROWTH-BEHAVIOR; FILM THICKNESS; Plasma Electrolytic Oxidation; Al alloys; Corrosion resistance; Defects; Voltage
ISSN
0010-938X
URI
https://pubs.kist.re.kr/handle/201004/149823
DOI
10.1016/j.corsci.2024.112123
Appears in Collections:
KIST Article > 2024
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