Characteristics of sealed plasma electrolytic oxidation coatings with electrochemical impedance spectroscopy

doi:10.1088/1674-1056/19/8/085202

Abstract 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.

Keywords: plasma electrolytic oxidation electrochemical impedance spectroscopy coating additives

Received: 20 January 2010
Revised: 19 February 2010
Accepted manuscript online:

PACS:	82.45.Hk	(Electrolysis)
	52.77.-j	(Plasma applications)
	81.20.Ev	(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
	81.65.Mq	(Oxidation)
	82.80.Ej	(X-ray, M?ssbauer, and other γ-ray spectroscopic analysis methods)
	82.80.Fk	(Electrochemical methods)

Fund: Project supported by the Funds for International Cooperation and Exchange of the National Natural Science Foundation of China (Grant No. 10811140326) and the State Key Program of the National Natural Science Foundation of China (Grant No. 10735090).

Cite this article:

Lü Guo-Hua(吕国华), Chen Huan(陈睆), Wang Xing-Quan(王兴权), Pang Hua(庞华), Zhang Gu-Ling(张谷令), Zou Bin(邹斌), Lee Heon-Ju, and Yang Si-Ze(杨思泽) Characteristics of sealed plasma electrolytic oxidation coatings with electrochemical impedance spectroscopy 2010 Chin. Phys. B 19 085202

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Characteristics of sealed plasma electrolytic oxidation coatings with electrochemical impedance spectroscopy

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