Paper Infomation
Pure Magnesium Deposition Characteristics in HFC-152a/CO2 Atmosphere
Full Text(PDF, 11682KB)
Author: Yiwen Zeng, Wenxiu Deng, Xianping Mao, Maosheng Wan
Abstract: The present paper studies the characterization of surface films of magnesium melt protected by HFC-152a/CO2 gases. The oxide film characterizes with densification and consists of four kinds of chemical elements, including F, Mg, O, and C. With the increasing concentration of HFC-152a, the atom fraction of F increases gradually, while that of O gradually decreases in the surface films. The analysis of XRD and XPS shows that the surface oxide film is mainly composed of MgF2, MgO and C.
Keywords: Protective Atmosphere; HFC-152a; Surface Film
References:
[1] John F, Swinton K. Environmental challenges facing the magnesium industry SF6 replacement[C]. Proceedings of the 60th Annual World Magnesium Conference, Stuttgart, Germany, International Magnesium Association, 2003. 10-16
[2] Aarstad K., Tranell G., Engh T., A. Various Techniques to Study the Surface of Magnesium Protected by SF6 [C]. 2003 TMS Annual Meeting, San Diego, 2003 Magnesium Technology, 5-10
[3] Zeng Yiwen, peng Liming, Mao xiemin et al. A New Low GWP Protective Atmosphere Containing HFC-152a for Molten magnesium against Ignition [J]. Materials Science Forms, 2005, (88-489):73-76
[4] Huang Zhiqiang, Zeng Yiwien, Mao Mingxian. Magnesium Alloy Melting Protected by Covering Gas Mixture Containing HFC-152a [J]. Special Casting &Nonferrous Alloys, 2006, 26(8): 532- 534
[5] ZENG Yi-wen, PENG Li-ming, MAO Xie-min, DING Wen-jiang. Protection of molten magnesium alloys by a mixing gas containing difluoromethane [J]. Special Casting &Nonferrous Alloys, 2005, 16(7): 406-407
[6] ZENG Yi-wen, MAO Ming-xian, HUANG Zhi-qiang. Research on magnesium melting protected by cover gas mixtures containing HFC-32 [J]. Foundary, 2006, 55(8): 776-779
[7] ZENG Yi-wen, WU Guo-hua, Oxidation behavior of molten magnesium in atmospheres of HFC-32/CO2 at high temperature [J].Transactions of Nonferrous Metals Society of China, 2013, 23(4):1145-1251
[8] CHEN Hu-kui, LIU Jian-rui, HUANG Wei-dong. High temperature oxidation characteristics and mechanism of molten magnesium in the atmosphere of air containing HFC-134a [J]. Acta Metallurgica Sinica, 2007, 43(6): 625-630
[9] XIONG Shou-mei, WANG Xian-fei. Protection behavior of fluorine-containing cover gases on molten magnesium alloys [J].Transactions of Nonferrous Metals Society of China, 2010, 20(7):1228-1234
[10] Chen Xiao Yang Huizhu. Protection Behavior of HFC-227ea/Air Cover Gases to Molten Magnesium Alloy [J].Foundry Engineering 2013, 37(1): 1-5