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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.53  No.3 (2012)  >  pp.559-564

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Formation of Black Ceramic Layer on Aluminum Alloy by Plasma Electrolytic Oxidation in Electrolyte Containing Na2WO4

I. J. Hwang1), K. R. Shin1), J. S. Lee2), Y. G. Ko2) and D. H. Shin1)
1) Department of Metallurgy and Materials Engineering, Hanyang University
2) School of Materials Science and Engineering, Yeungnam University

The formation of black ceramic layer produced by plasma electrolytic oxidation (PEO) coating has been investigated as a function of coating time. A series of PEO coatings was carried out on aluminum alloy sample in a phosphate electrolyte containing sodium tungstate (Na2WO4) with four different coating times, i.e., 20, 100, 200 and 300 s. As the coating time increased, the amount of tungsten element in the ceramic layer increased, resulting in the black ceramic layer. This phenomenon was discussed based on the electrochemical reaction assisted by micro sparks to form WO3 compounds in the ceramic oxide layer.

aluminum alloy, plasma electrolytic oxidation, coating time, tungsten oxide

Received: November 28, 2011
Accepted: December 19, 2011 , Published online: February 25, 2012
Copyright (c) 2012 The Japan Institute of Metals



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