Abstract
Abstract The influence of minor Nd substitution on the microstructure and corrosion resistance of Mg–Zn–Y alloy were investigated. Results indicate that the partial substitution of Nd for Y can effectively refine grains but deteriorate the corrosion resistance of extruded Mg–Zn–Y alloy. The corrosion rates, measured by immersion tests in 3.5% NaCl solution at 25°C, are 12 and 19 mm · y−1 for the Mg-5.6Zn-1.4Y and Mg-5.6Zn-1.0Y-0.4Nd alloys, respectively. The negative effect of Nd is associated with enhanced microgalvanic corrosion resulting from grain refinement and higher area of second phase, as well as to a degraded protectiveness of the corrosion product layer.
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