In this paper, the thermal decomposition process of magnesium acetate, Mg (CH3COO)2·4H2O, in nitrogen atmosphere was studied by thermal analysis methods, and the solid products after thermal decomposition were analyzed by XRD, FE-SEM and EDS. The results show that the thermal decomposition process of magnesium acetate went through four steps: the first step was the dehydration of magnesium acetate to produce anhydrous magnesium acetate; the second step was the conversion of anhydrous magnesium acetate to magnesium oxalate; the third step was magnesium oxalate to magnesium carbonate, and the final step was magnesium carbonate to magnesium oxide.
Nano‐MgO was successfully fabricated by a facile, inexpensive, and environment‐friendly synthetic method using filter paper as a bio‐template. The influence of the concentration of raw material Mg(CH3COO)2·4H2O on the textural properties of nano‐MgO was investigated, and the as‐prepared nano‐MgO was characterized by X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X‐ray analysis, thermo gravimetric analysis, Fourier transform infrared spectroscopy. The results of the experiment show the synthetic MgO fibres are composed of 20 nm tiny particles with a surface area of 68.28 m2/g and a pore width of 13 nm. When the concentration of Mg(CH3COO)2·4H2O solution was 0.03 mol/L, the product MgO copied the micro‐morphology of the filter paper. In addition, the photocatalytic activity of the prepared sample was investigated, and the results showed that the nano‐MgO prepared by this method has a higher catalytic activity than that prepared without a template.
Nano-MgO was prepared by microwave irradiated ionic liquid method. The influence of the volume of ionic liquid ([BMIM]Ac), microwave radiation power and microwave radiation temperature on the morphology of nano-MgO were investigated. The prepared nano-MgO was characterized by TG, XRD, EDS and SEM. The results showed that the nano-MgO prepared by this method has a short rod-like shape, uniform particle size, and good dispersibility. The average diameter of the prepared rod-shaped nano-MgO was 25 nm, the length was 67 nm, and the specific surface area was 48.27 m2/g. During the preparation process with microwave radiation, [BMIM]Ac is a good dispersant, which effectively reduces the agglomeration of nano-MgO and is easy to remove.
The protection of hexafluoropropylene/air mixed gas for molten magnesium at temperatures from 670 °C to 800 °C has been investigated. The morphology and the composition of the protective film formed on the surface of the melt at 700 °C for holding time of 30 min and 60 min were investigated by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results showed that the protective effect of the mixed gas on molten magnesium increased with the increasing of hexafluoropropylene concentration, the prolongation of holding time and the decrease of temperature. The protective film on the surface of the melt was uniform and continuous, and mainly composed of MgF2 and small amount of MgO.
The high temperature oxidation properties of magnesium fluoride powders in the atmosphere of air containing hydrofluorocarbon (HFC-134a) were characterized by EDS, SEM, XRD, and gravimetric analyses. The results showed that the oxidation property of magnesium fluoride powder was related to the concentration of HFC-134a, temperature and reaction time. With the concentration of HFC-134a decreasing, the temperature rising and the reaction time prolonging, the extent of magnesium fluoride oxidation increased. This result is great significance for further study of the protective theory of fluorine-containing gases on Mg and its alloys.
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