Abstract
Hydrothermal treatment is one of effective methods to improve the corrosion resistance of magnesium alloys. A facile strategy is proposed in this study to control the corrosion behavior of hydrothermally-treated magnesium-aluminum alloys with aluminum content of about 9 wt. %. Prior to hydrothermal treatment, aging treatment is attempted to modify their metallurgical microstructure. After hydrothermal treatment, both the unaged and the aged alloy have a layer of dense coating mainly consisting of magnesium hydroxide on their surfaces, but the aged alloy shows better corrosion resistance according to the results of electrochemical experiments and immersion tests in 3.5 wt. % NaCl solution. This enhancement mechanism is also discussed based on the formation and redistribution of fine Mg17Al12 phases in the matrix.
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