期刊
CORROSION SCIENCE
卷 140, 期 -, 页码 143-150出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.06.007
关键词
Passivity of steel in concrete; Long time exposure; Temperature effect; Porous electrode; Electrochemical impedance
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.
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