盐酸溶液中乌鲁托品对钢的缓蚀性能

盐酸溶液中乌鲁托品对钢的缓蚀性能 王保成1，2) 朱金华1) 1)西安交通大学金属材料强度国家重点实验室，西安7t0049 2)太原理工大学材料科学与工程学院，太原030024 摘 要 用 电 化 学阻抗谱(EIS)和开路电位测量法(OCPM)研究了在1mol·L-1盐酸溶液中乌鲁托 品(UP)与45#钢的界面吸附及缓蚀行为．EIS表明：随着缓蚀剂UP浓度的增大，吸附膜逐渐形 成，电荷传递电阻增大．在缓蚀剂浓度为0．01mo·L-1时，缓蚀效率出现最大值；大于该浓度时，缓 蚀效率下降．0cPM表明：加缓蚀剂uP前后体系自腐蚀电位的改变与温度的倒数呈线性关系． uP对阳极过程有抑制作用，是阳极型缓蚀剂；吸附热为35 kJ／mol，吸附形式为物理吸附． 关键词缓蚀剂；吸附；自腐蚀电位；机理 分类号TGl72 Corrosion inhibition behavior of urotrpine for steel in hydrochloric acid WANG Baocheng1,2), ZHU Jinhua1) 1) The State Key Laboratory for Mechanical Behavior of Metal MateriM, Xi'an Jiaotong University, Xi'an 710049, Ghina 2) School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China ABSTRACT The corrosion inhibition and adsorption behavior of urotropine (UP) for steel in a 1 mol·L-1 hydrochloric acid solution were studied by electrochemical impedance spectroscopy (EIS) and open circuit potential measurements (OCPM). The results of EIS showed that with increasing UP concentration, ad- sorption film formed gradually on the surface of the electrode and the charge transmission resistance in- creased. When the concentration of UP is 0.01 mol~ L 1, the maximum of inhibition efficiency was ob- served. When the concentration of UP was greater than 0.01 mol·L- 1, UP desorbed from the steel surface and made inhibition efficiency decreased. The results of OCPM indicated that the difference of corrosion po- tential before and after the addition of UP was linear with the reciprocal of temperature. The adsorption heat was - 35 kJ·mol- 1, the mode of adsorption was physical adsorption, and UP was an anodic inhibitor. KEY WORDS inhibitors; adsorption; corrosion potential; mechanism