Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 14    No. 3    June 2004

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Purifying effect of new flux on magnesium alloy
GAO Hong-tao(高洪涛), WU Guo-hua(吴国华), DING Wen-jiang(丁文江),
ZHU Yan-ping(朱燕萍)

State Key Laboratory of Metal Matrix Composites,
Shanghai Jiaotong University, Shanghai 200030, China

Abstract:A new flux which can remove both Fe and non-metallic inclusions in magnesium alloy was introduced. The Fe content of the magnesium alloy can be decreased greatly from 0.062% to lower than 0.005% (degree of AZ91D) after being purified by this new flux. The optimum addition of B2O3in the flux is 0.58 % by Gaussian Curve Fitting. Corrosion rate was measured after the specimen being immersed in 5% NaCl solution for 3 d. The results show that the corro-
sion rate of the magnesium alloy after purification by the new flux is only 0.3 mg·cm-2·d-1. On the other hand, nonmetallic inclusions in the magnesium alloy decrease with increasing addition of JDMJ in the new flux. Average volume fraction of the non-metallic inclusions in the magnesium alloy decreases from 1.52% to 1.08%, which leads to improvement in the mechanical properties of the magnesium alloy by 30%. The mechanisms of Fe reduction and non-metallic in clusion-removing in magnesium melt by purification with the new flux were also revealed.


Key words: magnesium alloy; flux; purification; Fe; non-metallic inclusion

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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