关键词: 氮化硅结合碳化硅, 耐腐蚀性能, 铝电解槽, 槽侧壁, 测试方法

Abstract: A new method was applied to the test of corrosion resistance of SiC-Si3N4 material. It refers to that the cryolite-alumina melt is aerated so as to simulate a working state inside the cell during Al electrolysis, then a specimen is put into a graphite crucible where the high-temperature molten salt was contained before. The CO2 aeration makes the specimen dynamically corrosive. Then, the volume change rate of the specimen under the joint action of electrolyte and CO2 gas is tested and compared with the data resulting from static electrolyte corrosion test. The specimen presents much higher corrosion. It means that CO2 gas has greater effect on corrosion resistance. The new dynamic corrosion method was applied to the SiC-Si3N4 samples supplied by three different firms and, according to the testing standard based on the method, the results were evaluated for their anti-corrosion properties. The method is simple and efficient to simulate the corrosion behavior of the inner lining materials in aluminum electrolysis cell and evaluate their anti-corrosion properties.