关键词: 镍铁尖晶石, 惰性阳极, 抗腐蚀性, 铝电解

Abstract: The NiFe2O4 inert anode was synthesized by high temperature solid-state reaction sintering method using NiO and Fe2O3 as main raw materials and adding MnO2 powder. The static thermal corrosion rates of inert anode samples were measured by weightloss, and the corrosion mechanism was discussed. The experimental results indicate that the static thermal corrosion rate of the sample added with 2%(ω) MnO2 powder is the lowest. Because MnO2 dopant enriches at crystal boundary, the corrosion reaction of molten salt to crystal grains occurs firstly at the crystal grain boundary, and forms MnAl2O4 phase, which is dense and prevents the cryolite molten salt to penetrate into the inert anode, thus reducing the corrosion.

Key words: NiFe2O4 spinel, inert anode, corrosion resistance, aluminum electrolysis