Effect Of Na2p2o7 Electrolyte And Al Alloy Composition On Physical And Crystallographical Properties Of Peo Coating Layer : Ii. Crystallographic Analysis Of Peo Layer

Crystal structure and chemical compositions of Plasma electrolytic oxidized layer of A-1100, A-2024, A-5052, A-6061, A-6063, A7075, ACD-7B and ACD-12 were investigated. The electrolyte for plasma electrolytic oxidation was mixture of distilled water, Na2P2O7, Cu, Cr metal salts and KOH. eta-Alumina, as well as alpha-alumina, was main crystal phase. Another crystals such as (Al0.948Cr0.052)(2)O-3 and (Al0.9Cr0.1)(2)O-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.