Characterization of plasma electrolytic oxide formed on AZ91 Mg alloy in KMnO4 electrolyte

Title
Characterization of plasma electrolytic oxide formed on AZ91 Mg alloy in KMnO4 electrolyte
Authors
유봉영
Keywords
magnesium alloy; plasma electrolytic oxidation; corrosion; nanohardness; potassium permanganate
Issue Date
2009-03
Publisher
ALLERTON PRESS INC
Citation
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, v. 19, No. 4, Page. 829-834
Abstract
The aim of this work is to investigate microstructure, corrosion resistance characteristics and nanohardness of the oxide layer on AZ91 Mg alloy by applying different voltage with KMnO4 contained solution. There are lots of closed pores that are filled with another oxide compound compared with the typical surface morphology with pore coated until 350 V of coating voltage. The thickness of oxide layer increases with increasing coating voltage. The oxide layer formed on AZ91 Mg alloy in electrolyte with potassium permanganate consists of MgO and Mn2O3. Corrosion potential of the oxide layer on AZ91 Mg alloy obtained at different plasma electrolytic oxidation(PEO) reaction stages increases with increasing coating voltage. The corrosion resistance of AZ91 Mg alloy depends on the existence of the manganese oxide in the oxide layer. The inner barrier layer composed of the MgO and Mn2O3 may serve as diffusion barrier to enhance the corrosion resistance and may partially explain the excellent anti-corrosion performance in corrosion test. Nanohardness values increase with increasing coating voltage. The increase in the nanohardness may be due to the effect of manganese oxide in the oxide layer on AZ91 Mg alloy coated from electrolyte containing KMnO4.
URI
https://www.sciencedirect.com/science/article/pii/S1003632608603593http://repository.hanyang.ac.kr/handle/20.500.11754/74683
ISSN
1003-6326
DOI
http://dx.doi.org/10.1016/S1003-6326(08)60359-3
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE