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Incheon, South Korea

Kim B.-Y.,Incheon National University | Lee D.Y.,Daelim University College | Shin M.C.,Korea Testing Laboratory | Shin H.-G.,Korea Testing Laboratory | And 3 more authors.
Journal of the Korean Ceramic Society | Year: 2010

Physical properties of Plasma electrolytic oxidized 8 different kinds of Al alloys, A-1100, A-2024, A-5052, A-6061, A-6063, A7075, ACD-7B and ACD-12 were investigated. The electrolyte for PEO was Na2SiO3 and NaOH and some alkali earthen metal salts system solution, η-alumina, as well as y-alumina, was main crystal phase, which were ever reported. Also, Al 4.95, Si1.05O9.52 was found only in this research. So we can conclude that the process conditions of PEO apparatus and composition and concentration of its electrolyte affects crystal structure and physical properties of PEO layers much more than the compositions of Al alloy. Source


Kim B.-Y.,Incheon National University | Lee D.Y.,Daelim University College | Kim Y.-N.,Korea Testing Laboratory | Jeon M.-S.,Korea Testing Laboratory | And 3 more authors.
Journal of the Korean Ceramic Society | Year: 2010

Physical properties of Plasma electrolytic oxidized 8 different types of Al alloys, A-1100, A-2024, A-5052, A-6061, A-6063, A-7075, ACD-7B and ACD-12 were investigated. The electrolyte for PEO was Na2SiO3 solutions with NaOH and some alkali earthen metal salts. Porous layer near the surface of PEO coating was not found, and surface roughness Ra50 was below 2.5 μm. Surface roughness was affected by growth rate of plasma electrolytic oxidized layer, not by Si content in Al alloy. Source


Kim B.-Y.,Incheon National University | Kim J.-G.,Incheon National University | Lee D.Y.,Daelim University College | Kim Y.-N.,Korea Testing Laboratory | And 3 more authors.
Journal of the Korean Ceramic Society | Year: 2012

Crystal structure and chemical compositions of Plasma electrolytic oxidized layer of A-1100, A-2024, A-5052, A-6061, A-6063, A-7075, ACD-7B and ACD-12 were investigated. The electrolyte for plasma electrolytic oxidation was mixture of distilled water, Na 2P 2O 7, Cu, Cr metal salts and KOH. ν-Alumina, as well as α-alumina, was main crystal phase. Another crystals such as (Al 0.948Cr 0.052) 2O 3 and (Al 0.9Cr 0.1) 2O 3 were also formed in the oxide layer. It was thought that the effect of electrolyte compositions on the physical properties and crystal system of PEO layers was greater than the effect of Al alloy composition variation. Source


Kim B.-Y.,Incheon National University | Kim J.-G.,Incheon National University | Lee D.Y.,Daelim University College | Jeon M.,Korea Testing Laboratory | And 3 more authors.
Journal of the Korean Ceramic Society | Year: 2012

Physical properties of plasma electrolytic oxidized layers of 8 different kinds of Al alloys, A-1100, A-2024, A-5052, A-6061, A-6063, A-7075, ACD-7B and ACD-12 were investigated. The electrolyte for plasma electrolytic oxidation was mixture of distilled water, Na 2P 2O 7, KOH and some metal salts. Growth rate of oxide layer was slower in Na 2P 2O 7 electrolyte system than in Na 2SiO 3 system, and Ra50 surface roughness of oxidized layer was below 1.2 μm. Surface hardness in Na 2P 2O 7 electrolyte system is higher than in Na 2SiO 3 system, and roughness was lower in Na 2P 2O 7 electrolyte system than in Na 2SiO 3 system. Source

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