适用于钢筋混凝土腐蚀监测的长效MnO2参比电极的研制
收稿日期: 2016-03-28
修回日期: 2016-04-19
网络出版日期: 2016-05-18
基金资助
国家自然科学基金项目（No. 51371087）资助
Preparations of MnO2 Reference Electrodes for Corrosion Monitoring of Reinforced Concrete
Received date: 2016-03-28
Revised date: 2016-04-19
Online published: 2016-05-18
以电解法制备的MnO2粉体为原料，研制了可用于混凝土环境中的固体MnO2长效参比电极. 在饱和Ca(OH)2溶液中近一年的监测数据显示，该参比电极具有较好的电位稳定性和抗干扰能力，其电极电位的漂移< 10 mV. EIS和极化曲线测试结果表明，相对于化学法合成的MnO2电极，电解法制备的MnO2参比电极具有较小的内阻、较大的交换电流密度、较强的抗极化能力和较低的温度系数（~ 0.68 mV·°C-1）. 在硬化砂浆中的长期测试表明，该电极在混凝土中的电极电位基本不受Cl-、有机胺阻锈剂的影响，能作为埋入式参比电极，满足混凝土中Cl-浓度、pH值和钢筋半电池电位的长期监测的要求，这对于海洋混凝土工程的耐久性监测具有较高的应用价值.
杨莉 , 徐兵 , 王海 , 董泽华 . 适用于钢筋混凝土腐蚀监测的长效MnO2参比电极的研制[J]. 电化学, 2017 , 23(1) : 36 -44 . DOI: 10.13208/j.electrochem.160328
In this work, the solid reference electrode was assemblied by using the electrochemically synthesized manganese dioxide (MnO2) (EMD) powder, gel electrolyte and thin mortar layer for the durability evaluation of concrete. The EMD reference electrode exhibited higher potential stability (< 10 mV drift) than the chemically synthesied MnO2 (CMD) based on half year potential tests in the saturated Ca(OH)2 solution and hardened mortar. In addition, the EMD electrode was almost insensitive to the presences of chloride ion and corrosion inhibitor. Electrochemical impedance and polarization curves indicate that the EMD electrode had lower charge transfer resistance，higher exchange current density and lower temperature coefficient than the CMD electrode. The EMD electrode could be a potential candidate as the long-term reference electrode for the durability management of concrete infrastructure.
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