Ja. Ye et Y. Sahai, INTERACTION AND INTERFACIAL-TENSION BETWEEN ALUMINUM-ALLOYS AND MOLTEN-SALTS, Materials transactions, JIM, 37(9), 1996, pp. 1479-1485
The interaction between liquid aluminum and molten salts was studied b
y metal loss and electrochemical methods. The polarization curves for
Al and Used Beverage Container (UBC) alloy in molten salts show that t
he corrosion rate of UBC is higher than that of pure Al, and the corro
sion rat; is higher in the equimolar NaCl-KCl+5%NaF salt melt than in
equimolar NaCl-KCl molten salt. It was found that magnesium in aluminu
m alloys dissolves preferentially into these molten salts. This can be
rationalized by the more negative free energy of MgF2, or the lower e
lectrode potential E(Mg/Mg2+) compared to E(Al/Al3+). The metal loss i
n molten salts increases with time and addition of fluorides. It was f
ound that the metal loss in molten salt was inversely related to the m
etal and molten salt interfacial tension. Finally, the Girifalco and G
ood model was used to calculate the interfacial tension between UBC al
loy and molten salts based on an interaction parameter calculated from
the interfacial tensions between pure aluminum and molten salts. The
predicted values are in reasonable agreement with the measured values
of interfacial tension.