表面封闭法对铝阴极耐腐蚀性的影响

发布时间：2019-04-13 21:56

【摘要】：目的提高锌电积中铝阴极表面耐腐蚀性能,从而延长其使用寿命,降低生产成本。方法对铝阴极采用不同的表面处理工艺,对耐腐蚀处理后的铝阴极进行了铜加速乙酸盐雾试验、电液腐蚀失重试验和工业扩大化试验研究,考察其耐腐蚀性能。结果在经历120 h盐雾腐蚀后,溶胶-硬脂酸封闭试样仅9.5%的表面被腐蚀,沸水封闭、铈盐封闭试样表面分别有50%与27%左右的面积遭到腐蚀破坏,出现腐蚀孔与腐蚀裂纹,而未经处理的普通铝板表面则已完全被腐蚀破坏。在电解液腐蚀失重试验中腐蚀32 min后,溶胶-硬脂酸封闭试样的单位面积失重达到0.4 mg/cm~2,沸水封闭、铈盐封闭试样的单位面积失重较为相近,均在0.9 mg/cm~2左右,普通铝板的单位面积失重高达1.3 mg/cm~2。工业扩大化试验中,溶胶-硬脂酸封闭后的铝阴极在锌电积生产40 d期间失重约为1.8%且其电流效率保持在91%左右,而普通铝阴极失重则达7.7%。使用90 d后,溶胶-硬脂酸封闭的铝阴极板还能正常使用,而普通铝阴极由于腐蚀破坏需要更换。结论采用沸水封闭、铈盐封闭和溶胶-硬脂酸封闭处理后的铝阴极板耐腐蚀性能均有相应提高,其中以溶胶-硬脂酸封闭工艺最佳。可见表面封闭法对于提高铝阴极耐蚀性延长使用寿命起到了较好作用,同时也保持了较高的电流效率。
[Abstract]:Aim to improve the corrosion resistance of aluminum cathode surface in zinc electrodeposition so as to prolong its service life and reduce production cost. Methods the corrosion resistance of aluminum cathode was studied by copper accelerated acetic acid spray test, electro-hydraulic corrosion weightlessness test and industrial expansion test after the aluminum cathode was treated with different surface treatment processes. The corrosion resistance of the aluminum cathode was studied by copper-accelerated acetic acid spray test, electro-hydraulic corrosion weight loss test and industrial expansion test. Results after 120 hours of salt spray corrosion, only 9.5% of the surface of sol-stearic acid sealed sample was corroded, boiling water was sealed, and about 50% and 27% of the surface area of cerium salt-sealed sample was damaged by corrosion. Corrosion holes and cracks appear, but the surface of untreated ordinary aluminum plate has been completely destroyed by corrosion. After 32 min corrosion in electrolyte corrosion test, the mass loss per unit area of sol-stearic acid sealed sample reached 0.4 mg/cm~2, and the mass loss per unit area of cerium salt sealed sample was about 0.9 mg/cm~2. Weight loss per unit area of ordinary aluminum sheet up to 1.3 mg/cm~2. In the industrial expansion test, the weight loss of sol-stearic acid sealed aluminum cathode is about 1.8% and its current efficiency is about 91% during 40 days of zinc electrodeposition, while the weight loss of ordinary aluminum cathode is 7.7%. After 90 days of use, the sol-stearic acid sealed aluminum cathode plate can still be used normally, while the common aluminum cathode needs to be replaced due to corrosion damage. Conclusion the corrosion resistance of aluminum cathode plate treated by boiling water sealing, cerium salt sealing and sol-stearic acid sealing has been improved correspondingly, among which sol-stearic acid sealing process is the best. It can be seen that the method of surface sealing can improve the corrosion resistance of aluminum cathode and prolong the service life of aluminum cathode, while maintaining a high current efficiency at the same time.
【作者单位】：湖南工业大学冶金与材料工程学院;株洲冶炼集团股份有限公司;
【基金】：湖南省自然科学基金项目(2015JJ5016) 湖南省研究生科研创新基金项目(CX2016B645)~~
【分类号】：TG174.4

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