In order to explain the corrosion inside 20th century power lines, the galvanic corrosion of steel and aluminum from 1949 was examined. In this investigation, 0.1 M Na₂SO₄ + 1 mM NaCl was used as moderately corrosive medium. Various electrochemical methods were applied to determine the corrosion potential and the different reactions involved in the corrosion process. The thickness of the oxide layer that regulates the corrosion of aluminum was obtained from impedance measurements and it was shown that the diffusion of oxygen through a porous oxide layer is the governing stage for the reaction occurring at the steel electrode. Finally, the corrosion of steel regulates the corrosion of both metals when they are in electrical contact.

中文翻译：

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旧架空线路的腐蚀：利用电化学技术深入了解铝钢电偶

为了解释 20 世纪输电线内部的腐蚀，对 1949 年以来钢和铝的电偶腐蚀进行了检查。在本次研究中，使用0.1 M Na ₂ SO ₄ + 1 mM NaCl 作为中等腐蚀性介质。应用各种电化学方法来确定腐蚀电位和腐蚀过程中涉及的不同反应。通过阻抗测量获得了调节铝腐蚀的氧化层厚度，结果表明氧通过多孔氧化层的扩散是钢电极发生反应的控制阶段。最后，钢的腐蚀调节两种金属在电接触时的腐蚀。