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6061 알루미늄 합금의 플라즈마 전해산화 피막의 표면기공율 및 부식특성에 미치는 Na₃PO₄ 농도 및 NaAlO₂ 봉공처리의 영향
송의석(Euiseok Song),김용태(Yong-Tae Kim),최진섭(Jinsub Choi) 한국표면공학회 2019 한국표면공학회지 Vol.52 No.3
In this study, surface porosity and corrosion resistance of PEO coatings prepared on the 6061 Al alloy were investigated in terms of sodium phosphate (Na₃PO₄) concentrations in an alkaline solution and NaAlO₂ sealing. The surface morphologies of the PEO coatings clearly show that the coatings film formed in 9 g L<SUP>-1</SUP> had the lowest porosity. The NaAlO₂ sealing was found to remove micropores and cracks existing on the surface of PEO coatings. As a result, the NaAlO₂ sealing resulted in the movement of corrosion potential toward more positive value and lower corrosion current density.