Protection behavior of fluorine-containing cover gases on molten magnesium alloys
The sulphur hexa-fluoride gas（SF6）, which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely high global warming potential（GWP）. The protection mechanism of SF6 containing cover gases on molten magnesium alloys was presented. The cover gas...
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| Published in | Transactions of Nonferrous Metals Society of China Vol. 20; no. 7; pp. 1228 - 1234 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
01.07.2010
State Key Laboratory of Automotive Safety and Energy,Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1003-6326 |
| DOI | 10.1016/S1003-6326(09)60283-1 |
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| Abstract | The sulphur hexa-fluoride gas（SF6）, which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely high global warming potential（GWP）. The protection mechanism of SF6 containing cover gases on molten magnesium alloys was presented. The cover gas protects the melt by reacting with the melt to form a coherent protective film on the melt surface. The film contains MgO and MgF2. Particles containing MgF2 form on the interface between the oxide film and the bulk magnesium alloy, which correspond to the concave areas from the surface observation. These particles increase the Pilling and Bedworth ratio of surface film and enhance the protective capability of the films. Based on the understanding of the mechanism of SF6, a melting technology in a sealed furnace was proposed, and the protection behavior of magnesium alloys in the sealed melting furnace was investigated under the protective atmosphere containing HFC-134a. The morphology and composition of the surface film were also studied. Experiments to evaluate the protective effect of two other fluorine containing gases with low GWPs on AZglD alloy in the sealed furnace were also carried out, and the results show that the new gases are potential substitutes for SF6. |
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| AbstractList | The sulphur hexa-fluoride gas(SF
6), which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely high global warming potential(GWP). The protection mechanism of SF
6 containing cover gases on molten magnesium alloys was presented. The cover gas protects the melt by reacting with the melt to form a coherent protective film on the melt surface. The film contains MgO and MgF
2. Particles containing MgF
2 form on the interface between the oxide film and the bulk magnesium alloy, which correspond to the concave areas from the surface observation. These particles increase the Pilling and Bedworth ratio of surface film and enhance the protective capability of the films. Based on the understanding of the mechanism of SF
6, a melting technology in a sealed furnace was proposed, and the protection behavior of magnesium alloys in the sealed melting furnace was investigated under the protective atmosphere containing HFC-134a. The morphology and composition of the surface film were also studied. Experiments to evaluate the protective effect of two other fluorine containing gases with low GWPs on AZ91D alloy in the sealed furnace were also carried out, and the results show that the new gases are potential substitutes for SF
6. The sulphur hexa-fluoride gas（SF6）, which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely high global warming potential（GWP）. The protection mechanism of SF6 containing cover gases on molten magnesium alloys was presented. The cover gas protects the melt by reacting with the melt to form a coherent protective film on the melt surface. The film contains MgO and MgF2. Particles containing MgF2 form on the interface between the oxide film and the bulk magnesium alloy, which correspond to the concave areas from the surface observation. These particles increase the Pilling and Bedworth ratio of surface film and enhance the protective capability of the films. Based on the understanding of the mechanism of SF6, a melting technology in a sealed furnace was proposed, and the protection behavior of magnesium alloys in the sealed melting furnace was investigated under the protective atmosphere containing HFC-134a. The morphology and composition of the surface film were also studied. Experiments to evaluate the protective effect of two other fluorine containing gases with low GWPs on AZglD alloy in the sealed furnace were also carried out, and the results show that the new gases are potential substitutes for SF6. TG1; The sulphur hexa-fluoride gas(SF6), which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely high global warming potential(GWP). The protection mechanism of SF6 containing cover gases on molten magnesium alloys was presented. The cover gas protects the melt by reacting with the melt to form a coherent protective film on the melt surface. The film contains MgO and MgF2. Particles containing MgF2 form on the interface between the oxide film and the bulk magnesium alloy, which correspond to the concave areas from the surface observation. These particles increase the Pilling and Bedworth ratio of surface film and enhance the protective capability of the films. Based on the understanding of the mechanism of SF6, a melting technology in a sealed furnace was proposed, and the protection behavior of magnesium alloys in the sealed melting furnace was investigated under the protective atmosphere containing HFC-134a. The morphology and composition of the surface film were also studied. Experiments to evaluate the protective effect of two other fluorine containing gases with low GWPs on AZ91D alloy in the sealed furnace were also carried out, and the results show that the new gases are potential substitutes for SF6. The sulphur hexa-fluoride gas(SF sub(6), which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely high global warming potential(GWP). The protection mechanism of SF) sub(6) containing cover gases on molten magnesium alloys was presented. The cover gas protects the melt by reacting with the melt to form a coherent protective film on the melt surface. The film contains MgO and MgF sub(2. Particles containing MgF) sub(2) form on the interface between the oxide film and the bulk magnesium alloy, which correspond to the concave areas from the surface observation. These particles increase the Pilling and Bedworth ratio of surface film and enhance the protective capability of the films. Based on the understanding of the mechanism of SF sub(6, a melting technology in a sealed furnace was proposed, and the protection behavior of magnesium alloys in the sealed melting furnace was investigated under the protective atmosphere containing HFC-134a. The morphology and composition of the surface film were also studied. Experiments to evaluate the protective effect of two other fluorine containing gases with low GWPs on AZ91D alloy in the sealed furnace were also carried out, and the results show that the new gases are potential substitutes for SF) sub(6). |
| Author | 熊守美 王先飞 |
| AuthorAffiliation | State Key Laboratory of Automotive Safety and Energy,Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China |
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| Cites_doi | 10.1016/S0921-5093(01)01750-6 10.1016/j.jallcom.2005.12.003 10.1016/j.ijrefrig.2008.01.013 10.1016/j.jclepro.2006.05.022 10.1016/j.matchemphys.2007.04.010 10.1016/j.jclepro.2006.01.008 10.1016/j.matlet.2006.02.086 10.1179/174328405X58904 |
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| Snippet | The sulphur hexa-fluoride gas（SF6）, which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely high... The sulphur hexa-fluoride gas(SF 6), which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely high... The sulphur hexa-fluoride gas(SF sub(6), which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely... TG1; The sulphur hexa-fluoride gas(SF6), which is commonly used as the cover gas of molten magnesium alloys in the magnesium industry today, has an extremely... |
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| SubjectTerms | Fluorine Furnaces Magnesium magnesium alloy Magnesium base alloys melt protection Melts protection mechanism Protective Protective coatings SF 6 SF6气体 Sulfur surface film 保护机制 全球升温 六氟化硫 合金熔化 气体保护 氟化镁 |
| Title | Protection behavior of fluorine-containing cover gases on molten magnesium alloys |
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