Corrosion behavior of rapidly solidified Mg-Zn-rare earth element alloys in NaCl solution |
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Authors: | Michiaki Yamasaki Naoyuki Hayashi Shogo Izumi Yoshihito Kawamura |
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Affiliation: | Department of Materials Science, Kumamoto University, Kurokami, Kumamoto 860-8555, Japan |
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Abstract: | Rapidly solidified flaky powder metallurgy (RS FP/M) processing was applied for preparation of corrosion-resistant bulk Mg alloys with Zn and rare earth elements. The corrosion behavior of the melt spun Mg-Zn-La and Mg-Zn-Yb alloy ribbons in 1% NaCl solution was investigated in order to determine optimum composition of corrosion-resistant Mg alloys. The effect of heat-treatment on the corrosion behavior of RS Mg-Zn-La and Mg-Zn-Yb alloys also was studied. In the Mg-Zn-La alloys, as-quenched alloys showed good corrosion resistance in the NaCl solution, but heat-treatment led to degradation due to microstructure change, that is, reduction in dispersion of the Mg17La2-type intermetallic compound. In the Mg-Zn-Yb alloys, both as-quenched and heat-treated Mg97.5Zn0.5Yb2 alloys exhibited low corrosion rates because fine distribution of Mg2Yb-type intermetallic compound in α-Mg matrix was not largely changed by heat treatment. |
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Keywords: | A. Magnesium alloy A. Rare earth element A. Zinc B. Rapid solidification C. Corrosion |
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