盐酸溶液中乌鲁托品对钢的缓蚀性能

Corrosion inhibition behavior of urotrpine for steel in hydrochloric acid

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0．01mol·L^(-1)时,缓蚀效率出现最大值；大于该浓度时,缓蚀效率下降．OCPM 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-35kJ／mol,吸附形式为物理吸附．

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, adsorption film formed gradually on the surface of the electrode and the charge transmission resistance increased. When the concentration of UP is 0.01 mol· L^-1, the maximum of inhibition efficiency was observed. 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 potential 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.