Phase transformation in plasma electrolytic oxidation coatings on 6061 aluminum alloy

被引：128

作者：

Dehnavi, Vahid ^{[1
]}

Liu, Xing Yang

Luan, Ben Li ^{[2
,3
]}

Shoesmith, David W. ^{[4
]}

Rohani, Sohrab ^{[1
]}

机构：

[1] Univ Western Ontario, Dept Chem & Biochem Engn, London, ON N6A 5B9, Canada

[2] Natl Res Council Canada, London, ON N6G 4X8, Canada

[3] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada

[4] Univ Western Ontario, Dept Chem, Surface Sci Western, London, ON N6A 5B7, Canada

来源：

SURFACE & COATINGS TECHNOLOGY | 2014年 / 251卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Plasma electrolytic oxidation; Phase transformation; Alpha alumina; Gamma alumina; Electrical parameters; MICROARC OXIDATION; CERAMIC COATINGS; ALPHA-ALUMINA; OXIDE COATINGS; GROWTH-BEHAVIOR; AL2O3; COATINGS; GAMMA-ALUMINA; MG ALLOY; TRANSITION; CORROSION;

D O I：

10.1016/j.surfcoat.2014.04.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Oxide coatings were produced on a 6061 aluminum alloy using a pulsed unipolar plasma electrolytic oxidation (PEO) process. The effect of electrical parameters including pulse frequency, duty cycle and current density on phase formation in the coatings was revealed using conventional and glancing angle X-ray diffraction. The results show that PEO coatings are mainly composed of gamma-Al2O3. Depending on the electrical parameters employed, the coatings can also contain alpha-Al2O3 and mullite with varying concentrations. Higher current densities and higher duty cycle were found to favor the formation of mullite. Under the experimental conditions used, the ratio of the integrated XRD peaks for alpha- and gamma-Al2O3 varied from 0 to about 0.6, indicating that the relative content of alpha-Al2O3 in the PEO coatings varied over a wide range. Longer pulse on-times and higher current densities promoted the gamma to alpha-alumina phase transformation. Depth profiling of PEO ceramic coatings using glancing angle XRD with different incident beam angles revealed that mullite was more concentrated in the top surface of the coatings. No significant variation in alpha-Al2O3 concentration across the coatings could be concluded in this study, unlike the results of some other studies. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.

引用

页码：106 / 114

页数：9

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