Effect of duty cycle and applied current frequency on plasma electrolytic oxidation (PEO) coating growth behavior

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2013.03.041
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TypeArticle
Journal titleSurface and Coatings Technology
ISSN0257-8972
Volume226
Pages100107; # of pages: 8
SubjectAlkaline electrolytes; Concentration distributions; Duty cycle; Electrical parameter; Elemental distribution; Frequency; Plasma electrolytic oxidation; Pulsed direct current; Aluminum; Ceramic coatings; Energy dispersive spectroscopy; Oxidation; Plasmas; Scanning electron microscopy; Electrolysis
AbstractCeramic coatings were created on the surface of 6061 aluminum alloy using a plasma electrolytic oxidation (PEO) process employing a pulsed direct current (DC) power mode in an alkaline electrolyte. The effect of electrical parameters including frequency and duty cycle on the microdischarge behavior and coating growth was investigated at constant current. Surface features of coatings were studied using scanning electron microscopy. Energy dispersive spectroscopy was employed to investigate elemental distribution on the coating surfaces and cross-sections. Applying lower duty cycles was found to result in increased breakdown voltages and microdischarges with higher spatial density and lower intensity. Further, applying a lower duty cycle was also found to promote the uniformity of silicon distribution in the coating. Based on these new findings, a new conceptual model is proposed to explain the concentration distribution of Si on the surface of coatings prepared at different duty cycles. © 2013 .
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270706
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Record identifierde47f0a1-00c9-44a0-8033-38d15eba8890
Record created2014-02-17
Record modified2016-05-09
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