Abstract
Magnesium aluminate spinel (MAS) has been considered a promising candidate ledge material used in aluminum electrolytic cell. In this study, the compacts of MgAl2O4 were firstly sintered by conventional sintering and two-step sintering methods and then the corrosion behavior of sintered samples in molten electrolyte (Na3AlF6–AlF3–CaF2–Al2O3) at 970 °C for different times was investigated. The results show that a MAS with a high relative density of 99.3% and a homogeneous microstructure consisting of small grains (560 nm) is achieved under optimum two-step sintering condition (T1 = 1500 °C/0 h and T2 = 1400 °C/20 h). The densification has improved the resistance of MgAl2O4 spinel against molten-electrolyte penetration. The corrosion mechanisms of MAS in Na3AlF6–AlF3–CaF2–Al2O3 bath are mainly the penetration of fluorides and bulk dissolution of MAS.
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