Abstract This study describes changes in the electrochemical properties of carbon steel reinforcement bars embedded in mortar after their exposure to a mild atmosphere for 15 years. The development of an oxide layer was followed using electrochemical impedance spectroscopy. The samples were also subjected to a temperature cycle that allowed an electrical equivalent model to be developed in order to understand the electrochemical behaviour. This study concluded that the oxides layer plays a key role in the corrosion process by supporting the cathodic reaction. The oxide layer was identified in the frequency range of 10 kHz―1 Hz, and it grew rapidly during years 3―10 of atmospheric exposure. The aged oxide layer was also damaged by temperature cycling, which decreased the barrier effect.

中文翻译：

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长期大气老化和温度对钢筋在砂浆中电化学行为的影响

摘要 本研究描述了嵌入砂浆中的碳钢钢筋在暴露于温和大气 15 年后电化学性能的变化。使用电化学阻抗谱跟踪氧化物层的形成。样品还经历了温度循环，从而可以开发等效的电学模型以了解电化学行为。该研究得出结论，氧化物层通过支持阴极反应在腐蚀过程中起关键作用。氧化层在 10 kHz-1 Hz 的频率范围内被识别，并且在大气暴露的 3-10 年期间迅速增长。老化的氧化层也被温度循环损坏，这降低了阻挡效果。