纯镁熔体低温静置沉降除铁过程分析
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摘要
对低温静置处理后的铸锭在不同高度进行了取样,研究了杂质Fe在熔体中的分布情况。结果表明,Fe浓度在纵向上形成了三个不同分布特征区域,上层镁熔体中的Fe含量明显降低;中层Fe含量变化不明显;底层Fe含量明显增加。根据沉降规律,分析并建立了Fe沉降的动力学模型。
The ingot after low temperature static treatment was sampled at different heights. The distribution of impurity Fe in melt was studied. The results show that it forms three different regions of Fe concentration distribution longitudinally and the content of Fe in the upper magnesium melt decreases obviously; the content of Fe in middle layer do not change obviously;the content of Fe in the bottom layer is obviously increased. According to the law of settlement, the dynamic model of Fe settlement was analyzed and established.
The ingot after low temperature static treatment was sampled at different heights. The distribution of impurity Fe in melt was studied. The results show that it forms three different regions of Fe concentration distribution longitudinally and the content of Fe in the upper magnesium melt decreases obviously; the content of Fe in middle layer do not change obviously;the content of Fe in the bottom layer is obviously increased. According to the law of settlement, the dynamic model of Fe settlement was analyzed and established.
引文
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[2]张建新,邵水军,郭学锋.合金元素对镁合金组织性能影响的研究进展[J].热加工工艺,2012,41(12):32-34.
[3]Liu M,Song G L.Impurity control and corrosion resistance of magnesium-aluminum alloy[J].Corrosion Science,2013,77(1):143-150.
[4]范晓明,马斌,刘晨辉.Sr、Mn对含铁AZ91合金力学及耐蚀性能的影响[J].热加工工艺,2012,41(4):80-82.
[5]张运,武建军,齐向前.合金成分对Al-Mn-Mg合金力学性能的影响[J].热加工工艺,2010,39(6):29-32.
[6]Nayeb-Hashemi A A,Clark J B,Swartzendruber L J.The Fe Mg(iron-magnesium)system[J].Bulletin of Alloy Phase Diagrams,1985,6(3):235-238.
[7]Zainal Abidin N I,Martin D,Atrens A.Corrosion of high purity Mg,AZ91,ZE41 and Mg2Zn0.2Mn in Hank's solution at room temperature[J].Corrosion Science,2011,53(3):862-872.
[8]Gao H T,Wu G H,Ding W J,et al.Study on Fe reduction in AZ91melt by B2O3[J].Materials Science and Engineering A,2004,368(1):311-317.
[9]Wu G H,Gao H T,Ding W J,et al.Study on mechanism of iron reduction in magnesium alloy melt[J].Journal of Materials Science,2005,40(23):6175-6180.
[10]Pan F S,Chen X H,Yan T,et al.A novel approach to melt purification of magnesium alloys[J].Journal of Magnesium and Alloys,2016,4(1):8-14.
[11]Haynes W M.CRC handbook of chemistry and physics[M].Boca Raton:CRC Press,2014.
[12]Ostrach S.Transport phenomena in materials processing[M].Warrendale:TMS,1994.