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采用线性电位扫描法研究了碳钢在不同脱脂剂浓度下的阳极极化过程,进一步研究了碳钢在不同不同脱脂剂浓度条件下、不同电位下的恒电位、恒电流电解行为,在此基础上对生产现场进行了考察。电化学实验表明:碳钢阳极极化过程依次经历活化区、钝化区、过钝化区及极限区;活化区基体活化溶解电流小,不影响电极寿命;过钝化区电极表面开始发生析氧反应;极限区析氧反应达到极限,使基体腐蚀反应大量发生,电极寿命降低;脱脂剂浓度越低、阳极电位越高,电极表面基体溶解反应速率越大,相应电极使用寿命越短。实际生产中,极板表面由于电流分布不均使其局部电流超过极限电流导致局部腐蚀发生,而电解槽内极板安装精度、电极表面气泡无法逸出、极板表面污泥淤积等都均会影响电流分布。
Linear potentiometric scanning was used to study the anodic polarization of carbon steel at different concentrations of degreasers. The potentiodynamic and galvanostatic electrolysis behaviors of carbon steel at different potentials were further studied under different concentrations of degreasing agents. Based on this, On the production site were inspected. Electrochemical experiments show that the anodic polarization process of carbon steel undergoes activation zone, passivation zone, over-passivation zone and limit zone in turn, and the activation dissolution current of the activation zone is small and does not affect the electrode life. Oxygen reaction; the limit zone oxygen reaction reaches the limit, so that a large number of corrosion reaction base, the electrode life reduced; degreasing agent concentration is lower, the anode potential is higher, the electrode surface matrix dissolution reaction rate, the shorter the life of the electrode. In actual production, due to the uneven current distribution on the surface of the plate, the local current exceeds the limiting current, causing local corrosion, and the mounting accuracy of the plate in the electrolytic cell, the air bubbles on the surface of the electrode can not escape, and the sludge deposition on the surface of the plate, Affect the current distribution.