Characteristics of sealed plasma electrolytic oxidation coatings with electrochemical impedance spectroscopy

Plasma electrolytic oxidation （PEO） coatings are prepared on aluminium with graphite powders added into the electrolyte. The scanning electron microscopy （SEM） coupled with an energy dispersive x-ray analysis system （EDX） is used to characterize the surface and the cross-section morphologies of the...

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Bibliographic Details
Published in:Chinese physics B 2010-08, Vol.19 (8), p.463-468
Main Author: 吕国华 陈睆 王兴权 庞华 张谷令 邹斌 Lee Heon-Ju 杨思泽
Format: Article
Language:English
Subjects:
Aluminium
Coatings
Corrosion resistance
Electrochemical impedance spectroscopy
Graphite
Oxidation
Plasma (physics)
Scanning electron microscopy
扫描电子显微镜
氧化涂层
涂层结构
电化学阻抗谱
石墨粉末
等离子体电解
谱特性
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Summary:Plasma electrolytic oxidation （PEO） coatings are prepared on aluminium with graphite powders added into the electrolyte. The scanning electron microscopy （SEM） coupled with an energy dispersive x-ray analysis system （EDX） is used to characterize the surface and the cross-section morphologies of the coatings. The electrochemical impedance spectroscopy （EIS） is used not only to evaluate the corrosion resistance but also to analyse the structure of the coating. Results show that graphite powders are embedded in the PEO coating. The corrosion resistances of both the inner barrier and the outer porous layer are greatly improved, and the EIS could give some valuable detailed information about the coating structure.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/19/8/085202