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(s)
고영건이강민[이강민]김연성[김연성]양해웅박주현신동혁[신동혁]
Keywords
AZ31 MAGNESIUM ALLOY; CORROSION-RESISTANCE; MECHANICAL-PROPERTIES; STABILIZED ZIRCONIA; MICROSTRUCTURE; SILICATE; SURFACE; ZIRCALOY-2; ALUMINUM; FLUORIDE
Issue Date
201501
Publisher
ELSEVIER SCIENCE INC
Citation
MATERIALS CHARACTERIZATION, v.99, pp.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/YU.REPOSITORY/33718http://dx.doi.org/10.1016/j.matchar.2014.11.014
ISSN
1044-5803
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공과대학 > 신소재공학부 > Articles
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