Park JangHyun, Jung MyeongGyu
Korea Institute of Future Convergence Technology, Hankyong National University, Anseong 17579, Korea.
Industry Academic Cooperation Foundation, Hankyong National University, Anseong 17579, Korea.
Materials (Basel). 2021 Sep 23;14(19):5508. doi: 10.3390/ma14195508.
In this study, the effect of NaCl and LiNO content on the deterioration of embedded rebars in concrete due to corrosion was examined by measuring the natural potential and impedance. Wet-dry cycles were performed to accelerate the corrosion of embedded rebars in reinforced concrete, following which the potential and impedance corresponding to the cycles were measured. For the reinforced concrete containing only NaCl, the passive film of the embedded rebar surfaces deteriorated after two weeks of accelerated corrosion, and its polarization resistance decreased. When 0.6 M LiNO per NaCl was added, the reinforced concrete deteriorated at the same rate as the normal embedded rebars, and the polarization resistance was higher than the initial values. When 1.2 M LiNO per NaCl was added, the passive film of the embedded rebars remained intact even after 10 weeks of accelerated corrosion, protecting the rebars from deterioration.
在本研究中，通过测量自然电位和阻抗，研究了氯化钠（NaCl）和硝酸锂（LiNO）含量对混凝土中埋入钢筋因腐蚀而劣化的影响。进行干湿循环以加速钢筋混凝土中埋入钢筋的腐蚀，随后测量与这些循环相对应的电位和阻抗。对于仅含有氯化钠的钢筋混凝土，经过两周的加速腐蚀后，埋入钢筋表面的钝化膜劣化，其极化电阻降低。当每氯化钠添加0.6M硝酸锂时，钢筋混凝土的劣化速率与普通埋入钢筋相同，且极化电阻高于初始值。当每氯化钠添加1.2M硝酸锂时，即使经过10周的加速腐蚀，埋入钢筋的钝化膜仍保持完整，保护钢筋不发生劣化。
