Influences of Current Density on the Properties of Micro-arc Oxidation Coatings on AZ91D Mg Alloy

J Chin Soc Corr Pro

2005, Vol. 25

Issue (6): 332-335 DOI:

Research Report

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Influences of Current Density on the Properties of Micro-arc Oxidation Coatings on AZ91D Mg Alloy

Yanhua Wang;Jia Wang

中科院海洋所

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Abstract By using optical microscopy, X-ray diffraction(XRD) and electrochemical impedance spectroscopy(EIS) technique, the structure, composition characteristics and the electrochemical properties of micro-arc oxidation(MAO) coatings prepared at different current density on AZ91D magnesium alloy were studied. It was found that with increasing the current density, the growth rate of the coating and its crystallization became higher, while the roughness and porosity of the coatings increased, and the film resistance Rf decreased. The properties of the coating were not cetermined by the total thickness, but the structure of the coating.

Key words: micro-arc oxidation magnesium alloy current drnsity electrochemical impedance

Received: 20 May 2004

ZTFLH:

TG146.2

Corresponding Authors: Yanhua Wang E-mail: wangyanhua@ms.qdio.ac.cn

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Yanhua Wang; Jia Wang. Influences of Current Density on the Properties of Micro-arc Oxidation Coatings on AZ91D Mg Alloy. J Chin Soc Corr Pro, 2005, 25(6): 332-335 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2005/V25/I6/332

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