|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Formation of ZrO2 in Coating on AZ31 Mg Alloy via Plasma Electrolytic Oxidation: Phase and Structure of Zirconia
||Jung-Woo Choi, Gye-Won Kim, Bongyoung Yoo, Dong-Hyuk Shin
|On-Site Speaker (Planned)
An investigation of the coating structure formed on AZ31 Mg alloy sample subjected to plasma electrolytic oxidation was examined by field-emission transmission electron microscopy. The plasma electrolytic oxidation process was conducted in a phosphoric acid electrolyte containing K<SUB>2</SUB>ZrF<SUB>6</SUB> for 600 s. Microstructural observations showed that the coating consisting of MgO, MgF<SUB>2</SUB>, and ZrO<SUB>2</SUB> phases was divided into three distinctive parts, the barrier, intermediate, and outer layers. Nanocrystalline MgO and MgF<SUB>2</SUB> compounds were observed mainly in the barrier layer of ~1 μm thick near to the substrate. From the intermediate to outer layers, various ZrO<SUB>2</SUB> polymorphs appeared due to the effects of the plasma arcing temperature on the phase transition of ZrO<SUB>2</SUB> compounds during the plasma electrolytic oxidation process. In the outer layer, MgO compound grew in the form of a dendrite-like structure surrounded by cubic ZrO<SUB>2</SUB>.
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