氯盐侵蚀混凝土结构延寿技术初探Ⅰ——模拟孔隙液中6种胺类有机物阻锈性能分析

发布时间：2019-05-11 15:56

【摘要】：采用动电位极化测量和电化学阻抗谱法,结合氯离子浓度、阻锈剂浓度及溶液pH值这3个影响因素,研究6种胺类有机物(三乙烯四胺、二甲胺、N,N-二甲基乙醇胺、1,6-己二胺、胍及乙醇胺)在有氯盐存在的模拟混凝土孔隙液中对钢筋锈蚀行为的影响.结果表明:随着氯离子浓度的增加,同一阻锈剂的阻锈能力下降;相同氯离子浓度下,不同的胺类阻锈剂阻锈效果不同;在pH=12.50情况下,当阻锈剂浓度与氯离子浓度比值接近1时,二甲胺、1,6-己二胺、胍及三乙烯四胺的阻锈效果比较理想,而乙醇胺和N,N-二甲基乙醇胺阻锈能力较弱;当阻锈剂浓度偏低时,其没有明显的阻锈效果,甚至有可能形成阳极腐蚀而加速钢筋腐蚀;随着溶液pH值的降低,钢筋的耐蚀性能降低,同一阻锈剂的阻锈效果下降.
[Abstract]:Six kinds of amine organic compounds (triethylenetetramine, dimethyl amine, N-dimethyl ethanolamine) were studied by potentiodynamic polarization measurement and electrochemical impedance spectroscopy (EIS), combined with chloride ion concentration, rust inhibitor concentration and pH value of solution. Effect of 6-hexanediamine, guanidine and ethanolamine) on corrosion behavior of steel bar in simulated concrete pore solution with chloride. The results showed that the rust inhibition ability of the same inhibitor decreased with the increase of chloride ion concentration, and the antirust effect of different amine antirust agents was different under the same chloride ion concentration, and the antirust effect of different amine antirust agents was different with the increase of chloride ion concentration. Under the condition of pH=12.50, when the ratio of rust inhibitor concentration to chloride ion concentration is close to 1, the rust inhibition effect of dimethyl amine, 1, 6-hexanediamine, guanidine and triethylenetetramine is ideal, while that of ethanolamine and N, N-dimethyl ethanolamine is weak. When the concentration of rust inhibitor is low, it has no obvious rust inhibition effect, and may even form anodic corrosion and accelerate the corrosion of steel bar. With the decrease of pH value of solution, the corrosion resistance of steel bar decreases, and the rust inhibition effect of the same rust inhibitor decreases.
【作者单位】：浙江大学结构工程研究所;浙江大学宁波理工学院土木建筑工程学院;
【基金】：国家自然科学基金重大国际合作项目(50920105806) 宁波市科技创新团队项目(2011B81005) 质检总局公益性科研项目(201210229-2) 杭州市科技计划项目(20130533B18) 浙江省自然科学基金资助项目(LQ14E080010) 科研发展专项(2014FZA4018)
【分类号】：TU375

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