STRUCTURE AND ELEMENT DISTRIBUTION OFAl2O3COATING ON ZL109 ALLOY BY PLASMA ELECTROLYSIS OXIDATION

Qing Dong, Chuanzhong Chen (), Diangang Wang and Xubo Wang
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Qing Dong: School of Materials Science and Engineering, Shandong University, Shandong Ji'nan 250061, P. R. China
Chuanzhong Chen: School of Materials Science and Engineering, Shandong University, Shandong Ji'nan 250061, P. R. China
Diangang Wang: School of Materials Science and Engineering, Shandong University, Shandong Ji'nan 250061, P. R. China
Xubo Wang: School of Materials Science and Engineering, Shandong University, Shandong Ji'nan 250061, P. R. China

Surface Review and Letters (SRL), 2006, vol. 13, issue 04, 503-507

Abstract: It is thought that the PEO (plasma electrolysis oxidation) coatings are difficult to be prepared on the castAl–Sialloys because these alloys contain lots of pure silicon phases. In the present study, oxide coatings with a thickness of about 10 μm were deposited on the substrate of the ZL109Al–Sialloy by a PEO treatment. XRD showed that the phase composition of the coating wasγ-Al2O3. SEM showed that the coating surface was porous, and the pore diameter was in the range of 1–5 μm. The cross-section view by EDS indicated that the coating matrix is quite dense, and there are few defects. Phosphorus from the applied electrolyte could be incorporated into the coating during the PEO process. A transitional zone with a thickness of about 3 μm was observed on the interface between the coating and substrate, and a high adhesive strength was expected. The average hardness of the coating was 576 HV0.025, which was 7.2 times higher than that of the substrate. High alloy element content of the substrate seems to have no remarkable and adverse influence on the structure and composition of the PEO coating.

Keywords: Plasma electrolysis oxidation; coating; phase analysis; morphology; castAl–Sialloys (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1142/S0218625X06008748

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