Protective behavior of an SO_2/CO_2 gas mixture for molten AZ91D alloy

查看全文 作　　者：Liang [1]Weizhong;Gao [1]Qiu;Chen [1]Fu;Liu [2]Honghui;Zhao [2]Zhenhua

机构地区：[1]Department of Materials Science&Engineering,Heilongjiang Institute of Science and Technology Harbin 150027,China;[2]Harbin Dongan Engine(Group)Company Limited,Harbin 150066,China

出　　处：《China Foundry》索引2012年第9卷第3期,共5页

基　　金：supported by the Ministry of Science and Technology Project of China(2009, No. GJB20011) 摘　　要：The protective behavior for a molten AZ91D alloy in an open melting furnace was investigated under a protective gas mixture containing 3% SO2 and 97% CO2, and the protection mechanism was discussed. Experimental results show that the gas mixture provides effective protection for AZ91D melt in the temperature range from 680 oC to 730 oC. The microstructure, chemical composition and phase composition of the surface film formed on the molten AZ91D alloy were analyzed using scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The SEM results demonstrate that the surface films with an average thickness between 0.5 μm and 2 μm are dense and coherent in the protected temperature range. The EDS results reveal that the surface film mainly contains elements S, C, O, Al and Mg. The XRD results show that the surface film consists of MgO, MgS and a small amount of C phase. 关键词：AZ91D镁合金混合气体保护二氧化硫二氧化碳熔融行为 AZ91D合金表面保护膜

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Protective behavior of an SO_2/CO_2 gas mixture for molten AZ91D alloy

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