Effect of PEO Process Conditions on Oxidized Surface Properties of Mg alloy, AZ31 and AZ91. II. Electrolyte

MST Technology, Incheon 21129, Korea(Received March 11, 2016; Revised March 15, 2016 ; Accepted March 16, 2016)Abstract: Effect of electrolyte composition and concentration on PEO coating layer were investigated. Mg alloy, Surface of AZ31 and AZ91 were oxidized using PEO with different electrolyte system, Na-P and Na-Si. and applied voltage and concentration. We measured thickness, roughness, X-ray crystallographic analysis and breakdown voltage of the oxidized layer. When increasing concentration of electrolyte, the thickness of oxide layer also increased too. And roughness also increased as concentration of electrolyte increasing. Breakdown voltage of coated layer showed same behavior, the voltage goes high as increasing thickness of coating layer, as increasing concentration of electrolyte, and increasing applied voltage of PEO. Mg