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http://dx.doi.org/10.5370/JEET.2015.10.4.1746

The Characteristic Study of Plasma Electrolytic Oxidation in AZ31B Magnesium Alloy  

Yu, Jae-Yong (Department of Applied Electron, Yeungnam University)
Choi, Soon-Don (Department of Applied Electron, Yeungnam University)
Yu, Jae-In (The Center of Research, Wiscohitec Co., LTD)
Yun, Jae-Gon (The Center of Research, Wiscohitec Co., LTD)
Ko, Hoon (The Research Institute, Techtrans Corp)
Jung, Yeon-Jae (The Research Institute, Techtrans Corp)
Publication Information
Journal of Electrical Engineering and Technology / v.10, no.4, 2015 , pp. 1746-1751 More about this Journal
Abstract
In this study low voltage Plasma Electrolytic Oxidation (PEO) was utilized to eliminate high voltage PEO drawbacks such as high cost, dimensional deformation and porosity. Low voltage PEO produces a thin coating which causes low corrosion resistance. In order to solve such problem, 0.1~0.6M pyrophosphates were added in a bath containing 1.4M NaOH, and 0.35M Na2SiO3. 70 V PEO was conducted at 25℃ for 3 minutes. Chemical composition, morphology and corrosion resistance of the anodized coating were analyzed. The anodized film was composed of MgO, Mg2SiO4, and Mg2O7P2. The morphology of film showed appropriately dense structure and low porosity in the anodized layers. It is found that low voltage Plasma Electrolytic Oxidation in cooperation with phosphating treatment can provide a good corrosion protection for the AZ31B magnesium alloy.
Keywords
Magnesium; AZ31B; Plasma electrolytic oxidation; Pyrophosphate; Low voltage;
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