核酸阻锈剂在模拟混凝土孔溶液中对钢筋的阻锈作用  

Corrosion Inhibition Effect of Nucleic Acid Corrosion Inhibitor on Rebar in Simulated Concrete Pore Solutions

作　　者：蒋林华[1,2] 姜少博 王珠银 金鸣[1] 白舒雅[1] 宋诗琦 

机构地区：[1]河海大学力学与材料学院,江苏南京210098 [2]江苏省水工新材料及防护工程技术研究中心,江苏南京210098

出　　处：《建筑材料学报》2017年第6期870-875,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51278167);"十三五"国家科技支撑计划项目(2015BAB07B04);中央高校基本科研业务费专项资金资助项目(2016B04514)

摘　　要：将一种具有20~80个碱基长度的核酸引物混合溶液溶解在缓冲液中作为核酸阻锈剂.采用电化学阻抗谱、动电位极化方法研究了核酸阻锈剂在不同NaCl浓度的模拟混凝土孔溶液中对钢筋的阻锈作用及其机理,并提出了核酸阻锈剂的最佳掺量.利用X射线光电子能谱(XPS)分析了在核酸阻锈剂作用下钢筋电极表面吸附膜的组成结构.结果表明:核酸阻锈剂能显著提高钢筋的耐蚀性,核酸阻锈剂的最佳掺量为模拟混凝土孔溶液总质量的4%.核酸与钢筋具有良好的协同效应,吸附在钢筋表面的核酸能够形成一层致密的薄膜,可有效阻止外来离子的侵蚀,使钢筋具有优越的耐蚀性.A mixed solution that had a length of 20 to 80 bases of each primer in nucleic acid buffer was used as nucleic acid corrosion inhibitor.The corrosion inhibition effect and mechanism of nucleic acid corrosion inhibitor on rebar in simulated concrete pore（SCP）solutions with different concentrations of NaCl were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization.The best dosage of the nucleic acid corrosion inhibitor was also investigated.The chemical composition of the adsorption films on the rebar surface was investigated using X-ray photoelectron spectroscopy（XPS）.It is found that the nucleic acid has an excellent corrosion inhibition effect,and the added amount of 4% nucleic acid by simulated concrete pore solutions mass is the best dosage.There is an excellent synergistic effect between nucleic acid and rebar.The nucleic acid is greatly adhered to the rebar surface and a dense film is formed which can restrict the corrosion attack and provide superior corrosion inhibition.

关 键 词：核酸 阻锈剂 模拟混凝土孔溶液 电化学方法 锈蚀 

分 类 号：TU528.042[建筑科学—建筑技术科学]