摘要
对铁和铜电极的电渗效果进行了室内试验研究,通过监测排水量、电极处电势损失、含水率等分析比较了两者对电渗效果的影响,结果表明,铁电极在电渗中的表现优于铜电极。铜作为电渗阳极时,通电4～6 h后其电流有一迅速下降过程,同时阳极电势损失大幅增加。还开展了不同阴阳极材料组合对电渗效果影响程度的试验研究,研究发现阳极材料对电渗效果影响很大,相比之下阴极材料的影响较弱。最后从电化学角度对试验结果作了较为合理的解释。本文首次在电渗过程中发现电化学钝化现象,并指出电化学钝化将大幅降低电渗的效率,实际工程中应避免其发生。
Laboratory tests are conducted to investigate the influence of ferrum and cuprum electrodes on electroosmotic effects, and they are analyzed and compared throughdrainage, voltage loss at the electrodes and water content monitoring. The results demonstrate a better performance of ferrum electrode than that of cuprum electrode. In the case of cuprum anode, a rapid decrease in current is observed for 4-06 hours after the test commences, together with a big voltage loss at the anode. Furthermore, the influence of different combinations of cathode and anode materials on electroosmosis is also explored. It is revealed that the anode materials occupy a leading role in electroosmosis while the cathode materials display little effect. A reasonable explanation to the laboratory findings in terms of electrochemistry is also given. The phenomenon of electrochemical passivation is first discovered in elecroosmosis. The electrochemical passivation will reduce the efficiency of elecroosmosis substantially and should be avoided in practical engineering.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第2期388-394,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50879076)
天津市软土特性与工程环境重点实验室开放基金项目(2011SCEEKL004)
关键词
铁电极
铜电极
电渗
电极材料
电化学
钝化
ferrum electrode
cuprum electrode
electroosmosis
electrode material
electrochemistry
passivation
