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Formation of ZrO2 in coating on Mg-3 wt.%Al-1 wt.%Zn alloy via plasma electrolytic oxidation: Phase and structure of zirconia

Title
Formation of ZrO2 in coating on Mg-3 wt.%Al-1 wt.%Zn alloy via plasma electrolytic oxidation: Phase and structure of zirconia
Author
신동혁
Keywords
Mg alloy; Plasma electrolytic oxidation; Coating; Transmission electron microscopy; K2ZrF6
Issue Date
2015-01
Publisher
ELSEVIER SCIENCE INC
Citation
MATERIALS CHARACTERIZATION, v. 99, Page. 101-108
Abstract
An investigation of the coating structure formed on Mg-3 wt.%Al-1 wt.%Zn 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 K2ZrF6 for 600 s. Microstructural observations showed that the coating consisting of MgO, MgF2, and ZrO2 phases was divided into three distinctive parts, the barrier, intermediate, and outer layers. Nanocrystalline MgO and MgF2 compounds were observed mainly in the barrier layer of similar to 1 mu m thick near to the substrate. From the intermediate to outer layers, various ZrO2 polymorphs appeared due to the effects of the plasma arcing temperature on the phase transition of ZrO2 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 ZrO2. (C) 2014 Elsevier Inc. All rights reserved.
URI
http://hdl.handle.net/20.500.11754/29137https://www.sciencedirect.com/science/article/pii/S1044580314003441?via%3Dihub
ISSN
1044-5803; 1873-4189
DOI
10.1016/j.matchar.2014.11.014
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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