Microstructural characteristics of oxide layers formed on Mg-9 wt%Al-1 wt%Zn alloy via two-step plasma electrolytic oxidation

Title
Microstructural characteristics of oxide layers formed on Mg-9 wt%Al-1 wt%Zn alloy via two-step plasma electrolytic oxidation
Author(s)
고영건이강민[이강민]신동혁[신동혁]
Keywords
AM50 MAGNESIUM ALLOY; CORROSION-RESISTANCE; CURRENT-DENSITY; ANODIC FILMS; COATINGS; BEHAVIOR; ADDITIVES; FLUORIDE
Issue Date
201412
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.615, pp.S418 - S422
Abstract
A study investigated the formation and microstructural features of the oxide layer formed on Mg-9 wt%Al-1 wt%Zn alloy coated by two-step plasma electrolytic oxidation (PEO) where an acid electrolyte with K2ZrF6 was used for the second PEO coating after the initial coating was done in an alkaline electrolyte. The microstructure, chemical compositions, and constituent compounds of the oxide layers were observed using scanning electron microscopy, electron probe micro-analyzer, and X-ray diffraction, respectively. The microstructural observations showed that the micropores caused by plasma discharge were formed in the oxide layers which were comprised of three different parts, namely, inner, intermediate, and outer layers from the substrate to the surface of the sample. The outer layer contained the highest concentration of Zr element whose amount decreased toward the substrate whereas the concentration of Mg element increased in the order of outer, intermediate, and inner layers. This finding suggested that the outer oxide layer was mainly comprised of ZrO2 compound while both ZrO2 and Mg2Zr5O12 compounds existed together as the main compounds in the intermediate oxide layer. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/30360http://dx.doi.org/10.1016/j.jallcom.2014.01.097
ISSN
0925-8388
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공과대학 > 신소재공학부 > Articles
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