N,N'-二苯基硫脲对Q235钢在酸性介质中的缓蚀作用及其与十二烷基磺酸钠的协同效应

腐蚀学报（英文）, 2011, 23(5): 422-426.

N,N'-二苯基硫脲对Q235钢在酸性介质中的缓蚀作用及其与十二烷基磺酸钠的协同效应

聂金艳 , 司云森 , 余强 , 王招娣

昆明理工大学材料科学与冶金工程学院, 昆明 650093

Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Techno-logy, Kunming 650093

关键词： Q235钢 , N,N'-diphenyl thiourea , sodium dodecyl sulfate , sulphuric acid , inhibitor , synergistic effect

Inhibition Effect of N,N'-Diphenyl Thiourea on Corrosion of Q235 Steel in Acid Medium and Synergistic Effect with Sodium Dodecyl Sulfate

NIE Jinyan , SI Yunsen , YU Qiang , WANG Zhaodi

Keywords： Q235 steel , N,N'-二苯基硫脲 , 十二烷基磺酸钠 , H₂SO₄ , 缓蚀剂 , 协同效应

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% H₂SO₄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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