Effect of process conditions on crystal structure of Al PEO coating. I. Unipolar pulse and coating time

Title
Effect of process conditions on crystal structure of Al PEO coating. I. Unipolar pulse and coating time
Authors
김배연함재호이득용전민석김용남김기윤최지원김성엽김광엽
Keywords
PEO; Al; Coating; Crystal structure; Unipolar pulse
Issue Date
2014-04
Publisher
한국결정성장학회지
Citation
VOL 24, NO 2, 59-64
Abstract
Crystallographic phases of Plasma electrolytic oxidized Al alloy, A1050, were investigated. The electrolyte of PEO was Na2Si2O3 and KOH. Unipolar pulse, 2000 μsec with 400 μsec + 420 V impulse, were applied for 2 min, 5 min, 15 min, and 30 min. γ-Alumina, as well as α-alumina, was main crystal phase. γ-Alumina was appeared in the beginning, then the amount of α-alumina was increased with time, but the amount of γ-alumina remained constant without any increasing. So, it is concluded that plasma gas produce γ-alumina at the first, and then γ-alumina transform α-alumina finally. During the transformation, high temperature of micro plasma gives transformation energy.
URI
http://pubs.kist.re.kr/handle/201004/48200
ISSN
12251429
Appears in Collections:
KIST Publication > Article
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