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Title: Formation of ZrO{sub 2} in coating on Mg–3 wt.%Al–1 wt.%Zn alloy via plasma electrolytic oxidation: Phase and structure of zirconia

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 K{sub 2}ZrF{sub 6} for 600 s. Microstructural observations showed that the coating consisting of MgO, MgF{sub 2}, and ZrO{sub 2} phases was divided into three distinctive parts, the barrier, intermediate, and outer layers. Nanocrystalline MgO and MgF{sub 2} 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} polymorphs appeared due to the effects of the plasma arcing temperature on the phase transition of ZrO{sub 2} 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}. - Highlights: • The barrier layer containing MgO and MgF{sub 2} was observed near to the Mg substrate. • In the intermediate layer, m-, t-, and o-ZrO{sub 2} compounds were additionally detected. • The outer layer contained MgO with the dendrite-like structure surrounded by c-ZrO{sub 2}. • The grain sizes of compounds in oxidemore » layer increased from barrier to outer layer.« less

Authors:
;  [1]; ;  [2]
  1. Department of Metallurgy and Materials Engineering, Hanyang University, Ansan 426-791 (Korea, Republic of)
  2. School of Materials Science and Engineering, Yeungnam University, Gyeongsan 712-749 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22476010
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 99; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM COMPOUNDS; DEPLETION LAYER; DIFFUSION BARRIERS; ELECTROLYTES; GRAIN SIZE; MAGNESIUM COMPOUNDS; MAGNESIUM FLUORIDES; MAGNESIUM OXIDES; NANOSTRUCTURES; OXIDATION; PHASE TRANSFORMATIONS; SUBSTRATES; TERNARY ALLOY SYSTEMS; TRANSMISSION ELECTRON MICROSCOPY; ZINC COMPOUNDS; ZIRCONIUM OXIDES

Citation Formats

Lee, Kang Min, Kim, Yeon Sung, Yang, Hae Woong, Park, Joo Hyun, Ko, Young Gun, E-mail: younggun@ynu.ac.kr, and Shin, Dong Hyuk, E-mail: dhshin@hanyang.ac.kr. Formation of ZrO{sub 2} in coating on Mg–3 wt.%Al–1 wt.%Zn alloy via plasma electrolytic oxidation: Phase and structure of zirconia. United States: N. p., 2015. Web. doi:10.1016/J.MATCHAR.2014.11.014.
Lee, Kang Min, Kim, Yeon Sung, Yang, Hae Woong, Park, Joo Hyun, Ko, Young Gun, E-mail: younggun@ynu.ac.kr, & Shin, Dong Hyuk, E-mail: dhshin@hanyang.ac.kr. Formation of ZrO{sub 2} in coating on Mg–3 wt.%Al–1 wt.%Zn alloy via plasma electrolytic oxidation: Phase and structure of zirconia. United States. https://doi.org/10.1016/J.MATCHAR.2014.11.014
Lee, Kang Min, Kim, Yeon Sung, Yang, Hae Woong, Park, Joo Hyun, Ko, Young Gun, E-mail: younggun@ynu.ac.kr, and Shin, Dong Hyuk, E-mail: dhshin@hanyang.ac.kr. 2015. "Formation of ZrO{sub 2} in coating on Mg–3 wt.%Al–1 wt.%Zn alloy via plasma electrolytic oxidation: Phase and structure of zirconia". United States. https://doi.org/10.1016/J.MATCHAR.2014.11.014.
@article{osti_22476010,
title = {Formation of ZrO{sub 2} in coating on Mg–3 wt.%Al–1 wt.%Zn alloy via plasma electrolytic oxidation: Phase and structure of zirconia},
author = {Lee, Kang Min and Kim, Yeon Sung and Yang, Hae Woong and Park, Joo Hyun and Ko, Young Gun, E-mail: younggun@ynu.ac.kr and Shin, Dong Hyuk, E-mail: dhshin@hanyang.ac.kr},
abstractNote = {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 K{sub 2}ZrF{sub 6} for 600 s. Microstructural observations showed that the coating consisting of MgO, MgF{sub 2}, and ZrO{sub 2} phases was divided into three distinctive parts, the barrier, intermediate, and outer layers. Nanocrystalline MgO and MgF{sub 2} 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} polymorphs appeared due to the effects of the plasma arcing temperature on the phase transition of ZrO{sub 2} 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}. - Highlights: • The barrier layer containing MgO and MgF{sub 2} was observed near to the Mg substrate. • In the intermediate layer, m-, t-, and o-ZrO{sub 2} compounds were additionally detected. • The outer layer contained MgO with the dendrite-like structure surrounded by c-ZrO{sub 2}. • The grain sizes of compounds in oxide layer increased from barrier to outer layer.},
doi = {10.1016/J.MATCHAR.2014.11.014},
url = {https://www.osti.gov/biblio/22476010}, journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 99,
place = {United States},
year = {Thu Jan 15 00:00:00 EST 2015},
month = {Thu Jan 15 00:00:00 EST 2015}
}