苯并三唑对模拟混凝土孔溶液中钢筋的阻锈作用

Study of benzotriazole as corrosion inbibitor of reinforcing steel in simulated concrete pore solution

应用线性极化、电化学阻抗谱和动电位极化等电化学方法研究了苯并三唑(BTA)对含有氯离子的模拟混凝土孔溶液中钢筋的阻锈作用,并通过微观测试方法对其阻锈机理进行探索。结果表明,含有0.25mol/LNaCl的模拟混凝土孔溶液(pH为12.5的饱和Ca(OH)2溶液)中加入等物质量(0.25mol/L)的BTA对钢筋有良好的阻锈作用。电化学测试证实了BTA对模拟混凝土孔溶液中钢筋的阻锈效果比常用的亚硝酸盐更明显,微观形貌观察发现BTA能与钢筋生成多层有机保护膜,保护钢筋免受氯离子侵蚀。以上结论均预示着BTA可能成为钢筋混凝土结构中具有很好应用前景的钢筋阻锈剂。

The inhibiting efficiency of benzotriazole（BTA）on reinforcing steel in simulated concrete pore solution with 0.25mol/L NaCl was studied by means of linear polarization resistance（LPR）,electrochemical impedance spectroscopy（EIS）and potentiodynamic polarization（PDP）.The results indicate that the corrosion inhibiting efficiency is good when 0.25mol/L BTA was added in simulated concrete pore solution（saturated Ca（OH）2 with pH about 12.5）.It was proved that the corrosion inhibiting efficiency of BTA is better than that of the well-known nitrite by electrochemical methods,and multilayer organic protective films were formed on the steel surface from the SEM images which may prevent the attack from chloride ions.To sum up,BTA may be an attractive inhibitor for inhibiting corrosion of reinforcing steel in reinforced concrete structures.