Influence of Nd and Y additions on the corrosion behaviour of extruded Mg-Zn-Zr alloys |
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Authors: | Jian-wei Chang Jun Duo Ya-zhen Xiang Hai-yan Yang Wen-jiang Ding Ying-hong Peng |
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Institution: | (1) Department of Materials Engineering, Ben Gurion University, P.O. Box 653, Beer Sheva, 84105, Israel;(2) Dead Sea Magnesium Ltd, Beer Sheva, Israel |
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Abstract: | To improve the corrosion resistance of wrought magnesium alloys through rare earth (RE) additions, the corrosion behaviour
of Mg-5Zn-0.3Zr-xNd (x=0, 1, and 2; wt%) and Mg-5Zn-0.3Zr-2Nd-yY (y=0.5 and 1; wt%) alloys in a 5wt% NaCl solution was investigated using immersion test and electrochemical measurements. The
results of immersion test show that Mg-5Zn-0.3Zr-2Nd alloy exhibits the best corrosion resistance among the tested alloys.
Electrochemical measurements show that secondary phases in RE-containing Mg-5Zn-0.3Zr alloys behave as less noble cathodes
in micro-galvanic corrosion and suppress the cathodic process. The additions of Nd and Y into Mg-5Zn-0.3Zr alloy also improve
the compactness of the corrosion product film and are beneficial to the corrosion resistance. |
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Keywords: | |
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