COMPARATIVE STUDY ON CHARACTERIZATION OF CORROSION RESISTANCE OF MICRO-ARC OXIDATION COATINGS ON MAGNESIUM ALLOYS

J Chin Soc Corr Pro

2010, Vol. 30

Issue (6): 442-448 DOI:

Research Articles

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COMPARATIVE STUDY ON CHARACTERIZATION OF CORROSION RESISTANCE OF MICRO-ARC OXIDATION COATINGS ON MAGNESIUM ALLOYS

MA Ying^1,2, FENG Junyan¹, MA Yuezhou¹, ZHAN Hua¹,GAO Wei²

1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050
2. Faculty of Engineering, University of Auckland, Auckland 1142, New Zealand

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Abstract Micro-arc oxidation (MAO) coatings were prepared on AZ91D magnesium alloys with same process. The corrosion resistance of coatings was characterized by immersion test, spot test and electrochemical tests, and the surface morphologies of coatings were observed with SEM. The results of six tests have shown that the corrosion resistance of magnesium alloys after MAO treatment is improved dramatically. The anti-corrosion ability of MAO coatings could not be presented properly with immersion test because it is hard to decide which evaluation criteria, weight loss or weight gain, should be taken due to corroded products that might be stuck in coatings with porous microstructure and were hardly eliminated completely. spot test has been considered as a quick way to detect the corrosion resistance of MAO coatings, but colour changing of drip liquid in the first place was adopted as proper counting point, and the concentration of nitric acid in drip liquid needed to be doubled when meeting coatings with good corrosion resistance in order to stimulate a corrosion action faster. Electrochemical tests have been considered to carry out the overall characterization of the corrosion resistance of MAO coatings properly, and more information such as corrosion potential, corrosion current and impedance etc could be obtained from the tests of cyclic voltammetry (CV), Tafel technique, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS), which in turn will enhance the further research on the corrosion behavior of coatings. Finally, the corrosion resistance of MAO coatings was closely related with the thickness and chemical composition of coatings and also with their internal and surface microstructure.

Key words: magnesium alloy micro-arc oxidation corrosion resistance immersion test spot test electrochemical test

Received: 17 September 2009

ZTFLH:

TG146.2

Corresponding Authors: MA Ying E-mail: mayingcn2008@163.com

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MA Ying, FENG Junyan, MA Yuezhou, ZHAN Hua,GAO Wei. COMPARATIVE STUDY ON CHARACTERIZATION OF CORROSION RESISTANCE OF MICRO-ARC OXIDATION COATINGS ON MAGNESIUM ALLOYS. J Chin Soc Corr Pro, 2010, 30(6): 442-448.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I6/442

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