混凝土模拟孔隙液中呸啶衍生物对钢筋的阻锈性能与机制

Corrosion Inhibition Effect of Perimidine Derivatives Corrosion Inhibitor on Rebar inSimulated Concrete Pore Solutions

制备了1H-呸啶(PED)和2-羟基-1H-呸啶(HPED),并研究了其在混凝土模拟孔隙液中对HRB400钢筋的阻锈作用。采用干湿循环试验、扫描电子显微镜、电化学阻抗谱以及量子化学方法研究其阻锈性能和在钢筋表面的吸附机理。结果表明:当呸啶衍生物浓度为0.12 mmol/L时,其在混凝土模拟孔隙液中对钢筋的阻锈效率均超过80%。此外,2-羟基-1H-呸啶结构中的2位含有羟基基团,所以HPED对钢筋的阻锈效果优于PED。而且,通过吸附等温线研究表明,呸啶衍生物能自发的吸附在金属表面,且吸附过程遵循Langmuir吸附。

1H-perimidine(PED)and 2-hydroxy-1H-perimidine(HPED)were prepared as corrosion inhibitors for HRB400 reinforced steel in simulated concrete pore solution.The corrosion inhibition performance and adsorption mechanism were investigated via dry and wet cycle experiments,scanning electron microscopy,electrochemical impedance spectroscopy and related theoretical calculations.The results show that the inhibition efficiencies of these compounds are more than 80%for HRB400 reinforced steel in SCP at a concentration of less than 0.12 mmol/L.Moreover,HPED functions as a more effective inhibitor rather than PED due to the presence of 2-position hydroxyl-group.In addition,the inhibitor molecules spontaneously adsorb onto reinforced steel surfaces to form a protective film,and the adsorption process follows the Langmuir isothermal model.