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http://dx.doi.org/10.5695/JKISE.2019.52.3.117

Effects of Na3PO4 Concentration on the Porosity of Plasma Electrolytic Oxidation Coatings Surface on the 6061 Al Alloy, and Subsequent-NaAlO2 Sealing  

Song, Euiseok (Department of Chemistry and Chemical Engineering, Inha University)
Kim, Yong-Tae (Department of Chemistry and Chemical Engineering, Inha University)
Choi, Jinsub (Department of Chemistry and Chemical Engineering, Inha University)
Publication Information
Journal of the Korean institute of surface engineering / v.52, no.3, 2019 , pp. 117-122 More about this Journal
Abstract
In this study, surface porosity and corrosion resistance of PEO coatings prepared on the 6061 Al alloy were investigated in terms of sodium phosphate ($Na_3PO_4$) concentrations in an alkaline solution and $NaAlO_2$ sealing. The surface morphologies of the PEO coatings clearly show that the coatings film formed in $9g\;L^{-1}$ had the lowest porosity. The $NaAlO_2$ sealing was found to remove micropores and cracks existing on the surface of PEO coatings. As a result, the $NaAlO_2$ sealing resulted in the movement of corrosion potential toward more positive value and lower corrosion current density.
Keywords
6061 Al alloy; Plasma electrolytic oxidation; Sodium phosphate; $NaAlO_2$ sealing;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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