INFLUENCE OF ADDITIONS OF Al2O3 POWDERS IN ELECTROLYTICAL SOLUTION ON MICROSTRUCTURE AND CORROSION PROTECTION OF CERAMIC COATINGS FORMED ON MAGNESIUM ALLOY DURING MICRO-ARC OXIDATION

J Chin Soc Corr Pro

2007, Vol. 27

Issue (4): 202-205 DOI:

Research Report

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INFLUENCE OF ADDITIONS OF Al2O3 POWDERS IN ELECTROLYTICAL SOLUTION ON MICROSTRUCTURE AND CORROSION PROTECTION OF CERAMIC COATINGS FORMED ON MAGNESIUM ALLOY DURING MICRO-ARC OXIDATION

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太原理工大学;表面工程研究所

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;. INFLUENCE OF ADDITIONS OF Al2O3 POWDERS IN ELECTROLYTICAL SOLUTION ON MICROSTRUCTURE AND CORROSION PROTECTION OF CERAMIC COATINGS FORMED ON MAGNESIUM ALLOY DURING MICRO-ARC OXIDATION. J Chin Soc Corr Pro, 2007, 27(4): 202-205 .

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Abstract AZ91D magnesium alloy was treated by micro-arc oxidation (MAO) in the optimized composite solution of silicate-phosphate system in which Al2O3 powders were added.Morphological characteristic and phase constituent of ceramic coatings were analyzed using the scanning electron microscope (SEM) and the x-ray diffraction (XRD).The results showed that after adding Al2O3 powders pores in ceramic coatings decreased and the loose layer became more compact，new phase of Al2O3 appeared.Electrochemical corrosion experiments in 3.5%NaCl solution showed that corrosion resistance of ceramic coatings after adding Al2O3 powders was also improved greatly.

Key words: magnesium alloy Al2O¬ 3 powders micro-arc oxidation（MAO） morphologies characteristic phase

Received: 10 January 2006

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2007/V27/I4/202

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