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在已研发MnO2电极基础上,试验研究内部碱性电解质溶液对MnO2电极稳定性和重现性的影响,以及外部碱性电解质溶液NaCl浓度对MnO2电极电位影响。结果表明,含饱和Ca(OH)2溶液MnO2电极和含混凝土模拟液MnO2电极具有良好的重现性和稳定性,后者的重现性和稳定性比前者有所提高。在外部混凝土模拟液中NaCl浓度不大于0.01mol/L条件下,两者的电极电位波动不超过2mV。在NaCl浓度大于0.01mol/L(如冬季公路除冰盐环境)条件下,前者电位保持稳定,后者电位随NaCl浓度增大而增加。因此在NaCl浓度较大情况下,含饱和Ca(OH)2溶液MnO2参比电极电位稳定,而含混凝土模拟液MnO2参比电极电位偏差较大。
Based on the developed MnO2 electrode, the influence of internal alkaline electrolyte solution on the stability and reproducibility of MnO2 electrode and the effect of NaCI concentration of external alkaline electrolyte solution on MnO2 electrode potential were studied. The results show that MnO2 electrode with saturated Ca (OH) 2 solution and MnO2 electrode with concrete simulation liquid have good reproducibility and stability. The reproducibility and stability of the latter are better than the former. In the external concrete simulation liquid NaCl concentration of not more than 0.01mol / L conditions, the two electrode potential fluctuations of not more than 2mV. Under the conditions of NaCl concentration greater than 0.01mol / L (such as winter highway deicing salt environment), the potential of the former remained stable, while the latter increased with increasing NaCl concentration. Therefore, under the condition of high NaCl concentration, the potential of MnO2 reference electrode with saturated Ca (OH) 2 solution is stable, while the deviation of potential of MnO2 reference electrode with concrete simulation liquid is larger.