Thermodynamics of Aluminium in Molten Zinc with the use of Electrochemical Sensors

Abstract

In the present study the thermodynamics of aluminium in molten Zn‐Al was determined at the temperatures 470, 490 and 520°C with the use of electrochemical sensors. Cell and sensor techniques were used. The following concentration cell was used: Al (pure reference) |Al3+ (in fused salt) | [Al]in zinc. It was found that the activity of aluminium shows positive deviation from Raoult's law. The partial heat of solution of aluminium at temperatures between 470 and 520°C for XAl = 0.004 was determined as = 21882 J. The dilute solution of aluminium in zinc in the range of 0≤XAl≤0.044 obeys Henry's law. The Wagner's first order interaction coefficient eAlAl was determined.