摘要
利用电化学阻抗谱法(EIS)对比研究了新型耐蚀钢筋(00Cr10MoV)和普通低碳钢筋(20MnSiV)在混凝土模拟液中的自钝化、碳化以及碳化与氯盐耦合作用下的电化学行为,并利用扫描电镜(SEM)观察了钢筋表面腐蚀产物的形貌.结果表明,00Cr10MoV钢筋在钝化期的致钝性明显优于20MnSiV钢筋,且在碳化、碳化与氯盐耦合作用下,00Cr10MoV钢筋的耐蚀性也更强.电化学参数拟合中,00Cr10MoV钢筋在碳化期的钝化膜电阻和电荷转移电阻分别约为20MnSiV钢筋的3倍和58倍;00Cr10MoV钢筋在碳化和氯盐耦合作用期的钝化膜电阻和电荷转移电阻相比于20MnSiV钢筋分别提高约89%和99%.碳化与氯盐耦合作用后,00Cr10MoV钢筋表面仅生成少量点蚀坑,而20MnSiV钢筋表面则出现大量疏松的腐蚀产物.
Electrochemical impedance spectroscopy (EIS) was used to compare the electrochemical behaviors of the corrosion-resistant rebar (00Cr10MoV) and the ordinary low-carbon rebar (20MnSiV) in simulated concrete pore solutions on spontaneous passivation, carbonation, and simultaneous carbonation and chloride attack. Moreover, scanning electron microscopy (SEM) was used to observe the morphology of corrosion products on the surface of rebars. The results show that the passivation capacity of 00Cr10MoV rebar is much better than that of 20MnSiV rebar, and the corrosion resistance of 00Cr10MoV rebar subjected to carbonation and simultaneous carbonation and chlorides attack is also higher compared with that of 20MnSiV rebar. In the electrochemical parameter fitting, the passivation film resistance and charge transfer resistance of 00Cr10MoV rebar in the carbonation period are about 3 times and 58 times that of 20MnSiV rebar, respectively;Compared with the 20MnSiV rebar, the passivation film resistance and charge transfer resistance of 00Cr10MoV rebar in the simultaneous carbonation and chloride attacking period increase by 89% and 99%, respectively. After simultaneous carbonation and chlorides attacking, only a small amount of corrosion pits are found on the surface of 00Cr10MoV rebar, however, a large amount of loose corrosion products are observed on the surface of 20MnSiV rebar.
作者
刘新
吴淼
施锦杰
Liu Xin;Wu Miao;Shi Jinjie(School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第3期502-506,共5页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51678144)
江苏省自然科学基金资助项目(BK20161420)
关键词
耐蚀钢筋
电化学阻抗谱
碳化与氯盐耦合
腐蚀产物
corrosion-resistant rebar
electrochemical impedance spectroscopy
simultaneous carbonation and chloride attacking
corrosion products
作者简介
刘新(1995-),男,博士生;联系人:施锦杰,男,博士,副教授,jinjies@seu.edu.cn.
