<正> 一、前言 目前海上船舶和建筑物几乎都采用了牺牲阳极或外加电流的阴极保护措施。按照不同材质和涂层,选择最佳阴极保护电位是保证保护效果并防止过保护的一项至关重要的研究内容。到目前为止在通常的使用环境中(中性水溶液,土壤等),还只是依靠经验来确定,都选用比自然腐蚀电位大约负0.3伏的电位值作为最佳阴极保护电位值,也有的利用阴极极化曲线的弯曲点来确定。最近水流徹等用交流阻抗技术做了这方面的探讨。我们结合船用钢的阴极保护工作,用交流阻抗技术研究了不同表面状态下电极的交流阻抗特征及确定最佳阴极保护电位的方法。
Impedance measurements in wide frequency range(65kHz-lmHz)using 1250 FRA have been applied to 3C, 16Mn and 09MnNb steels with and without oxide film, and to 09MnNb steel painted with epoxy resin in 3 NaCl solution at different potentials with a polarization range of-300 mV. The optimum cathodic protection potentials(E_p)of different steels were obtained. The efficiency of cathodic protection can be calculated from Faradaic impedance measured at E_(corr) and E_p under various conditions.
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