CORROSION PROTECTION OF AZ91DMgALLOY COATING WITH MICRO-ARC OXIDATION FILM EVALUATED BY IMMERSION AND ELECTROCHEMICAL TESTS

X. P. Zhang and G. Chen
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X. P. Zhang: Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China
G. Chen: Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

Surface Review and Letters (SRL), 2005, vol. 12, issue 02, 279-287

Abstract: This paper describes the preliminary results of corrosion protection of AZ91DMgalloy coated with a micro-arc oxidation (MAO) coating. The corrosion behavior of coated substrates was evaluated by means of immersion and electrochemical tests in 5 wt.%NaClsolution. The immersions tests include weight loss measurement after full or partial immersion with the whole coat and full immersion with the damaged coat. The electrochemical tests include polarization curves and electrochemical impedance spectroscopy (EIS) measurements. The results of immersion and electrochemical tests show that micro-arc oxidation (MAO) surface treatment can significantly improve the corrosion resistance of the AZ91DMgalloy in 5%NaClsolution, and the corrosion protection effect of the MAO coating is not sensitive to pores or cracks in the coating. The charge transfer resistanceRct, increases from about 1.669Ωcm2for the uncoated alloy to about 1113Ωcm2after being coated with MAO coat.

Keywords: Magnesium alloy; corrosion protection; immersion test; electrochemical test (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05007013

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