中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 14 No. 3 June 2004 |
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
