电解金属锰铅阳极板在小分子有机酸中的腐蚀性研究

摘要

Both immersion test and electrochemical technology were used to measure the weightlessness,open circuit potential,polarization and impedance spectroscopy (EIS)of lead plate for anode in the small molecular organic acid.The results showed that,in the same kind of organic acid solution,anode plate under 40℃ to weightlessness is greater than the normal temperature,and soaking late weightlessness is greater than the previous. With increasing concentration of the organic acid solution,the greater is anode plate corrosion.Formic acid and acetic acid can dissolve anode surface passivation in early stage.Corrosion of oxalic acid started in later period especially when anode surface passivation was dissolved.When small molecular organic acids coexist,the corrosion of positive plate is accelerated under the synergy effect.%采用浸泡试验和电化学技术试验研究了电解金属锰铅阳极板在3种小分子有机酸溶液的失重、开路电位、极化、阻抗。结果表明，在同一种有机酸溶液中，铅阳极板在40℃下失重大于常温，浸泡后期失重大于前期；随着有机酸溶液的浓度增大，阳极板的腐蚀程度也越大，甲酸和乙酸的腐蚀性主要表现在早期可以溶解阳极板表层钝化物，而草酸的腐蚀性则体现在后期，特别是当阳极板表面钝化物被溶解腐蚀后，当小分子有机酸共存时，协同作用加快铅阳极板的腐蚀。