Abstract
The corrosion mechanisms of a high-anticorrosive Mg-Zn-Gd alloy have been unveiled. Numerous particles were observed and identified as anodic W phase. Nevertheless, due to a small potential difference between the secondary phase and Mg matrix, and the nanoscale size and dispersed distribution of the particles, no serious pitting would occur. The segregation of Zn in the MgO layer was found to be favorable for the compactness of the whole corrosion layer. The preferential corrosion of W phase should be partly responsible for this segregation. A new method has been presented to develop Mg alloys with high corrosion resistance by alloying.
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