采用动电位极化、交流阻抗、失重测试等方法研究了一种新合成的三氮唑-苯胺化合物(DOT)在1 mol/L HCl中对Q235钢的缓蚀性能，其腐蚀形貌用电子显微镜进行观察，结合吸附热力学和动力学，讨论其缓蚀机理。结果表明，在酸溶液中，DOT能同时抑制碳钢腐蚀的阴、阳极反应过程，是一种优异的混合型缓蚀剂，其浓度为0.001 mol/L时缓蚀效率可达96%以上。吸附热力学表明DOT在碳钢表面上的吸附过程为放热过程，其在碳钢表面的吸附服从Langmuir等温式，属于物理和化学吸附。

A new triazole-phenylamide derivative (DOT) is synthesized and its inhibiting action on the corrosion of mild steel in 1 mol/L HCl solution is investigated by means of potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurements. Thermodynamic and kinetic parameters are calculated and discussed. Then the surface morphology is studied by scanning electron microscopy (SEM). Results show that DOT strongly inhibits the corrosion of Q235. The inhibition efficiency of 0.001 mol·L-1 DOT is more than 96%. Polarization curves indicate that the DOT acts as a mixed-type inhibitor, the cathodic and anodic processes of corrosion are suppressed. Thermodynamic and kinetic parameters are obtained from weight loss of the different experimental temperatures, which suggests that at different temperatures (298~333 K) the adsorption of DOT on metal surface obey Langmuir adsorption isotherm model. The adsorption processes are exothermic reaction and belong to chemisorption and physisorption.

国家高技术研究发展计划(863计划)资助项目(2008AA09Z31);重庆市工程技术研究中心建设资助项目(STC2009CB5014)