| 摘要: |
| 为探究不锈钢钢筋珊瑚混凝土的长期耐蚀性，采用线性极化、交流阻抗、极化曲线等方法，研究了珊瑚混凝土中304、2205不锈钢钢筋在3.5% NaCl溶液中750 d的锈蚀电流密度，并与强度等级相当的普通混凝土中碳钢钢筋进行对比.结果表明：珊瑚混凝土中不锈钢钢筋锈蚀电流密度始终低于0.10 μA/cm2，750 d后不锈钢钢筋仍处于钝化状态，其中2205不锈钢钢筋的锈蚀电流密度更低；普通混凝土中碳钢钢筋腐蚀电流密度始终维持在珊瑚混凝土中不锈钢钢筋的10倍以上，750 d时碳钢钢筋发生了明显锈蚀；线性极化法测量的钢筋锈蚀状态与实际观察结果吻合较好，更适用于测量混凝土中钢筋锈蚀状态. |
| 关键词: 珊瑚混凝土 不锈钢钢筋 锈蚀速率 线性极化 交流阻抗 |
| DOI：10.3969/j.issn.1007-9629.2021.06.026 |
| 分类号:TU511.3 |
| 基金项目:国家自然科学基金资助项目（51601074）；中央高校基本科研业务费专项基金资助项目（B200202058） |
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| Corrosion Rate of Stainless Steel Rebar in Coral Concrete Prepared with Seawater |
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FENG Xingguo1,2, LU Xiao1,2, LU Xiangyu1,2, YANG Yashi3, LUO Feng1,2
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1.Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security， Hohai University， Nanjing 210098， China;2.College of Harbour， Coastal and Offshore Engineering， Hohai University， Nanjing 210098， China;3.College of Water Conservancy Engineering， Wanjiang University of Technology， Maanshan 243000， China
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| Abstract: |
| For investigating the long-term corrosion resistance of stainless steel rebar in coral concrete， the corrosion current densities of stainless steel rebar type 304 and 2205 were measured by applying the linear polarization resistance， electrochemical impedance spectroscopy， and polarization curve methods in the coral concrete in 3.5% NaCl solution for 750 days. Simultaneously， the corrosion current density was compared to that of the carbon steel in the similar strength grade of ordinary concrete. The results suggest that the corrosion current density of the stainless steel rebar is lower than 0.10 μA/cm2， and maintained passivation in the coral concrete after 750 days in 3.5% NaCl solution. In comparison， the corrosion current density of stainless steel rebar type 2205 is lower than that of the 304 counterparts. Moreover， the corrosion current density of the carbon steel rebar is 10 times higher than that of the stainless steel rebar with the result that the former samples are severely corroded. In general， the corrosion state calculated from the linear polarization resistance is most consistent with the observed. Therefore， the linear polarization resistance method is proposed to test the corrosion rate of rebar in concrete. |
| Key words: coral concrete stainless steel rebar corrosion rate linear polarization electrochemical impedance spectroscopy |
