局部交流阻抗扫描技术,原位测定金属/溶液体系中电极表面局部交流阻抗的分布,以研究电极表面局部电化学行为。本文叙述该技术的实验方法及所研制的扫描探头,并建立实验装置。该技术不受溶液电导率的限制,具有快速、准确、灵敏等特点。对腐蚀电偶电极阻抗分布的测试结果表明,在阴极极化条件下,电偶的局部腐蚀得到不同程度的控制,据此可确定电偶腐蚀行为及其最佳保护参数。
The localized a. c. impedance scanning technique can be used to detect in-situ distributions of local a. c. impedance on electrode surface and to study electrochemical behavior of the small area under investigation. A scanning probe which scanned over electrode surface was designed. Measuring procedure was not influenced by solution conductivity The impedante distributions of metal galvanic couple surface was measured. It was shown that, under cathodic protection, localized corrosion rate decreased to various extent. The optimum potential of cathodic protection could be determined.
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