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Implications when alloying Magnesium into Aluminium melt

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T. Doppler, H. Antrekowitsch, H. Boettcher, W. Fragner

Aluminium melts with magnesium show characteristic oxidation behaviour and it is possible that the oxidation rate suddenly increases. This phenomenon is known as breakaway oxidation and has to be avoided in the casthouse. Therefore it is necessary to define the parameters which cause these undesirable reactions. Trace elements in the input material like calcium could have a possible influence on this effect. Different investigations for proofing this hypothesis and for evaluating the quality of different sources of magnesium were done. Especially the beginning of the breakaway oxidation as well as the effect of Ca was studied. Therefore the dross formation on AlMg5-melts was investigated in a resistance furnace at a scale of 30 kg. The binary alloy was produced using primary aluminium and magnesium. Calcium was added via a master alloy. After alloying, the melt was skimmed and held at 740 °C for eight hours under standard atmosphere conditions (air, 1 atm). The temperature of the melt was measured continuously and at the end of the holding period the dross was skimmed. To consider a possible influence of the atmosphere, thermogravimetric analysis (TGA) were carried out at 740 °C under furnace atmosphere conditions and synthetic air at samples that were taken from the resistance furnace.

Diese Kategorie durchsuchen: Light Metals (Mg, Li, Ti)
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