Properties of Anodic Coatings Obtained in an Organic, Environmental Electrolyte by Micro Arc Oxidation on Magnesium Alloy

Abstract:

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In a solution containing 10g/L NaOH and 12g/L phytic acid, anodic coatings were obtained by micro arc oxidation (MAO) on AZ91HP magnesium alloy. The morphology, structure and composition of anodic coatings were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX). The corrosion resistance of magnesium alloy before and after MAO treatment was evaluated by immersion test and potentiodynamic polarization testing in 3.5wt. % NaCl solution. The coatings were evenly formed on the substrate and mainly composed of MgO. EDX analyses showed that phytic acid took part in the coating formation. Compared with the substrate, the corrosion resistance of magnesium alloy after MAO treatment was improved considerably.

Info:

Periodical:

Advanced Materials Research (Volumes 189-193)

Edited by:

Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang

Pages:

1001-1004

DOI:

10.4028/www.scientific.net/AMR.189-193.1001

Citation:

R. F. Zhang et al., "Properties of Anodic Coatings Obtained in an Organic, Environmental Electrolyte by Micro Arc Oxidation on Magnesium Alloy", Advanced Materials Research, Vols. 189-193, pp. 1001-1004, 2011

Online since:

February 2011

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Price:

$35.00

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