摘要
Abstract: In order to improve the properties of NiFe2O4 spinel based inert anode, some additive MnO2 were added to raw materials. NiFe2O4 spinel with MnO2 was made by solid-phase reaction at 1200℃ for 6 h. XRD were carried out and the effects of MnO2 on density, conductivity and corrosion resistance were measured. XRD shows when MnO2 was added no new phases exist and MnO2 and NiFe2O4 formed solid solution; Mn 4+ replaced parts of Fe 3+ and the sample still had the structure of NiFe2O4 spinel. The crystal lattice of NiFe2O4 spinel became aberrated when MnO2 was added, which can promote sintering, and improve density. Because Mn 4+ replaces parts of Fe 3+ and produces conduction electron, which can improve conductivity. The corrosion resistance of the samples was enhanced. When MnO2 is 1.0%, the sample’s corrosion rate is 1/5 of that of the sample without MnO2. The reason is that Al2O3 in the melt reacts with Mn 4+ in the sample to produce MnAl2O4. MnAl2O4 forms a dense protecting coat, which can prevent melt from eroding further. Because the key problem with inert anodes is anode corrosion, so we consider the optimal amount of MnO2 is 1.0%.
Abstract： In order to improve the properties of NiFe2O4 spinel based inert anode, some additive MnO2 were added to raw materials. NiFe2O4 spinel with MnO2 was made by solid-phase reaction at 1200℃ for 6 h. XRD were carried out and the effects of MnO2 on density, conductivity and corrosion resistance were measured. XRD shows when MnO2 was added no new phases exist and MnO2 and NiFe2O4 formed solid solution; Mn replaced parts of Fe^3＋ and the sample still had the structure of NiFe204 spinel. The crystal lattice of NiFe2O4 spinel became aberrated when MnO2 was added, which can promote sintering, and improve density. Because Mn^1＋ replaces parts of Fe^3＋ and produces conduction electron, which can improve conductivity.The corrosion resistance of the samples was enhanced. When MnO2 is 1.0%, the sample＇s corrosion rate is 1/5 of that of the sample without MnO2. The reason is that Al2O3 in the melt reacts with Mn^4＋ in the sample to produce MnAl2O4,. MnAl2O4 forms a dense protecting coat, which can prevent melt from eroding further. Because the key problem with inert anodes is anode corrosion, so we consider the optimal amount of MnO2 is 1.0%.
出处
《广东有色金属学报》
2005年第2期132-137,共6页
Journal of Guangdong Non-Ferrous Metals
关键词
二氧化锰
镍
铁
惰性阳极
密度
防腐蚀性
铝
NiFe2O4 spinel
inert anode
density
corrosion resistance
XRD
