Effect of process conditions on crystal structure of Al PEO coating. II. Bipolar and electrolyte

Title
Effect of process conditions on crystal structure of Al PEO coating. II. Bipolar and electrolyte
Authors
김배연함재호이득용전민석김용남김기윤최지원김성엽김광엽
Keywords
PEO; Al; Coating; Crystal structure; Bipolar pulse
Issue Date
2014-04
Publisher
한국결정성장학회지
Citation
VOL 24, NO 2, 65-69
Abstract
Crystallographic phases of Plasma electrolytic oxidized Al alloy, A1100, A5052, A6061, A6063, A7075, were investigated. Two types of electrolyte Na2Si2O3 and Na2P2O7 were also compared. Bipolar pulse, 2000 μsec with 400 μsec + 420 V impulse and 300 μsec − impulse were applied for 20 min. α-Alumina, γ-alumina, η-alumina, Al4.95Si1.05O9.52, and (Al0.9Cr0.1)2O3 were mainly observed. Si, component of electrolyte, were moved into the PEO layer by bipolar pulse. Glassy phase was also observed at the surface of Na2Si2O3 electrolyte treated PEO layer, and increased with the Mg content of Al alloy. It is concluded that at first glassy phase was formed by the micro plasma, and the high temperature of plasma turns glassy phase to several crystalline phases. And we could expect that many other crystalline phase could be formed by PEO process.
URI
http://pubs.kist.re.kr/handle/201004/48201
ISSN
12251429
Appears in Collections:
KIST Publication > Article
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