用动电位扫描极化曲线、电化学阻抗法和量子化学法,研究了N,N′-二苯基硫脲（DPH-TU）在5%H_2SO_4介质中对Q235钢的缓蚀作用机理,及其与十二烷基磺酸钠（SDBS）的协同缓蚀效应结果表明N,N′-二苯基硫脲是一种缓蚀效果显著的混合型缓蚀剂.当DPH-TU和SDBS共存时呈现协同缓蚀效果,两者浓度比为1：1时,协同效应最为显著.两种缓蚀体系在Q235钢表面发生了化学吸附,吸附过程为放热过程,服从El-Awady动力学模型并计算出相应的吸附过程热力学数据.
The inhibition behavior and mechanism of N,N＇-diphenyl thiourea（DPH-TU） on the corrosion of Q235 steel in sulphuric acid medium and the synergistic effect of DPH-TU and sodium dodecyl sulfate（SDBS） were studied by using polarization curves measurements,electrochemical impedance spectroscopy（EIS） and quantum chemistry methods.The results showed that DPH-TU was an effective mixing type inhibitor.The two inhibitors showed significant synergistic inhibition effect on the corrosion of steel,which became the most significant when concentration ratio of the two inhibitors was 1：1.It was suggested that the adsorption of DPH-TU and SDBS on Q235 mild steel might be a chemosorption of exothermic processs.The corresponding thermodynamic parameters of the adsorption process for DPH-TU/ SDBS were calculated according to the El-Awady kinetic model.
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