Correlation between plasma electrolytic oxidation treatment stages and coating microstructure on aluminum under unipolar pulsed DC mode

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2014.11.007
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TypeArticle
Journal titleSurface and Coatings Technology
ISSN0257-8972
Volume269
Pages9199; # of pages: 9
SubjectAluminum; Coatings; Electrolysis; Microhardness; Microstructure; Morphology; Oxidation; Scanning electron microscopy; Silicates; Surface morphology; 6061 aluminum alloys; Alumina coating; Coating microstructures; Different stages; Electrical parameter; Microhardness tests; Plasma electrolytic oxidation; Voltage-time response
AbstractAlumina coatings were deposited on 6061 aluminum alloy substrates using plasma electrolytic oxidation (PEO) in an alkaline silicate electrolyte. Different electrical parameters, including frequency, duty cycle, and current density were applied to obtain PEO coatings. Scanning electron microscopy (SEM) and microhardness tests were used to investigate the coating microstructure and properties. For each sample, the voltage-time response of the PEO process was obtained and compared with surface morphology, and coating cross sections and thicknesses. Special consideration was given to the connection between the electrical parameters, different stages of the PEO process, and the morphology and microstructure of the coatings. Applying different electrical parameters changed the duration and ratio of the PEO stages in the voltage-time response curve and affected the growth rate, surface morphology, microstructure and microhardness of the coatings. We report the new finding of a correlation between the stage of the PEO process and the microstructure and morphology of the coating.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; Automotive and Surface Transportation
Peer reviewedYes
NPARC number21276912
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Record identifier81d8e2ff-c0c5-415b-9fc8-47b0c593ea2c
Record created2015-11-10
Record modified2016-05-09
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