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以NiO和Fe2O3为原料,采用固相烧结法合成了NiFe2O4尖晶石,通过添加ZrO2纤维[ZrO2(f)]制备了ZrO2(f)-NiFe2O4惰性阳极材料.采用失重法测量了阳极试样在冰晶石熔盐中的静态热腐蚀率和电解腐蚀率,并对腐蚀机理进行了探讨.结果表明,ZrO2(f)添加量由0增加至4%(ω)时,阳极试样的气孔率从4.9%上升到5.8%,导致其静态热腐蚀率由3.8mg/(cm2·h)增大到4.3mg/(cm2·h);在电场作用下,氧化物在冰晶石熔盐中的溶解反应受到抑制,含3%(ω)ZrO2(f)阳极试样的电解腐蚀率为2.2mg/(cm2·h),远小于其静态腐蚀率,腐蚀均为物理化学溶解过程;高温下ZrO2(f)在冰晶石熔盐中稳定性良好,可作为铝电解NiFe2O4基惰性阳极的强韧化材料.
NiFe and Fe2O3 were used as raw materials to synthesize NiFe2O4 spinel by solid-state sintering, ZrO2 (f) -NiFe2O4 inert anode material was prepared by adding ZrO2 fiber [ZrO2 (f)]. The anode sample The results show that the porosity of the anode samples increases from 0 to 4% (ω) when the amount of ZrO2 (f) increases from 4.9% increase to 5.8%, resulting in a static thermal corrosion rate increased from 3.8mg / (cm2 · h) to 4.3mg / (cm2 · h); under the action of an electric field, the dissolution of the oxide in cryolite molten salt The corrosion rate of the anode sample containing 3% (ω) ZrO2 (f) was 2.2mg / (cm2 · h), much less than its static corrosion rate. The corrosion was all physicochemical dissolution process. Under high temperature, ZrO2 ) Has good stability in cryolite molten salt and can be used as toughening material for inert anode of aluminum electrolytic NiFe2O4 base.