AZ91HP magnesium alloy was melted by CO 2 laser. Compared with as-received Mg alloy, the grain of the melted layer was refined significantly and the content of Al was increased. The corrosion resistance of the melted layer was improved because of the grain refinement, the redistribution of b-Mg 17 Al 12 and the increasing of the Al content. As compared to the non-overlapping zone, the overlapping zone of the melted layer was liable to be corroded.
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