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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Effect of Na2B4O7 on iron reduction in magnesium alloys AZ31 and AZ91
WU Guo-hua(吴国华), GAO Hong-tao(高洪涛), WANG Wei(王 玮), DING Wen-jiang(丁文江)

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China

Abstract:Effect of Na2B4O7, a new iron reduction agent, on iron reduction in magnesium alloys AZ31 and AZ91 was studied. The iron contents in the magnesium alloy AZ31 and AZ91 reduce dramatically to less than 0.002% (mass fraction) with the increasing addition of Na2B4O7, and the corrosion resistance of the alloys was greatly improved. According to the thermodynamic analysis and the iron and boron distributions in different parts of the alloy melts, it can be inferred that the mechanism for iron reduction in magnesium alloys by Na2B4O7 processing is that boron atoms combine with iron atoms and settle down in the melting sludge. The XRD result confirms it.

 

Key words: Na2B4O7; iron reduction; corrosion resistance; AZ31 magnesium alloy; AZ91 magnesium alloy

ISSN 1672-7029
CN 43-1423/U

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