期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 474, 期 1-2, 页码 541-545出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.06.135
关键词
Magnesium alloy; Sol-gel process; MAO coating; Corrosion; Electrochemical impedance spectroscopy
资金
- National key technology R&D program of China [2006BAB09B04]
Protective composite coatings were obtained on a magnesium alloy by micro-arc oxidation (MAO) and sol-gel technique. The coatings consisted of a MAO layer and a sol-gel layer. The microstructure and composition of the MAO coating and the composite coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive X-rays (EDX). Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and total immersion tests were used to evaluate the corrosion behavior of these coatings in a 3.5 wt.% NaCl solution. The results show that the sol-gel layer provides corrosion protection by physically sealing the pores in the MAO coating and acting as a barrier. The composite coatings can suppress the corrosion process by preventing the corrosive ions from transferring or diffusing to the magnesium alloy substrate. This enhances the corrosion resistance of the magnesium alloy AZ91D significantly. (C) 2008 Elsevier B.V. All rights reserved.
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