EIS를 이용한 콘크리트 내부 철근의 부식거동평가에 관한 실험적 연구
An Experimental Study of the Corrosion Behavior Evaluation of Rebar in Concrete by Using Electrochemical Impedance Spectroscopy (EIS) Method
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초록
NaCl과 LiNO2의 첨가량에 따른 콘크리트에 매립된 철근의 부식거동을 전기화학적 임피던스 분광법을 이용하여 고찰하였다. 부식가속 방법중 하나인 건습반복법을 이용하여 단기간 내에 부식현상을 촉진하였으며, 측정된 임피던스 값을 통해 등가회로를 제안할 수 있었다. NaCl 1.2 kg/m3이 첨가된 콘크리트에 매립된 철근의 부동태 피막이 빠르게 파괴되는 것을 확인할 수 있었으며, 염화물 첨가량 대비 0.6M의LiNO2를 첨가한 경우 부식진행속도가 크게 저하하는 것을 확인할 수 있었다. 또한 염화물 첨가량 대비 1.2M의 LiNO2를 첨가한 경우 부동태 피막이 부식가속시간이 지나도 파괴되지 않고 성능이 유지되는 것을 확인할 수 있었다.
Abstract
The corrosion behavior of a rebar in concrete according to the amount of NaCl and LiNO2 was observed by using Electrochemical ImpedanceSpectroscopy. The corrosion was accelerated in a short time by using dry/wet cycles method, which is one of the corrosion acceleration methods, andthough the value of measured impedance, equivalent circuit can be introduced. It was confirmed that the passive film of a embedded rebar in concretewith NaCl was broken quickly, and when 0.6M LiNO2 was added, the velocity of ongoing corrosion was declined considerably compared to the amountof NaCl. However, when 1.2M LiNO2 was added, it was confirmed that the passive film was not broken and its performance remained ,compared tothe amount of NaCl.
참고문헌 (14)
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