The protective surface film formed on molten ZK60 magnesium alloy in 1,1,1,2-tetrafluoroethane/air atmospheres |
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| Authors: | Hukui Chen Jianrui Liu |
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| Affiliation: | a Department of Chemistry and Chemical Engineering, Baoji University of Arts and Science, Baoji 721 007, PR China
b State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710 072, PR China |
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| Abstract: | The composition, microstructure and growth kinetics of the surface film formed on molten ZK60 magnesium alloy in 1,1,1,2-tetrafluoroethane/air mixture were investigated by using SEM, EDS, XRD, XPS and TG. The results show that the film formed in 0.01% 1,1,1,2-tetrafluoroethane/air was non-protective, and its phase composition changed with melt temperature. At 760 °C, the film was mainly composed of MgO and some MgF2 and ZrO2, whereas at 660 °C it consisted mainly of MgO and Mg3N2. The film formed in air containing 0.1% 1,1,1,2-tetrafluoroethane or higher was comprised of MgF2 and C with small amounts of MgO, and it was protective. |
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| Keywords: | A. Molten magnesium alloy C. Surface film A. 1,1,1,2-Tetrafluoroethane C. Microstructure |
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