盐酸介质中油酸钠在钢表面的吸附及缓蚀作用  

Absorption and inhibition effect of sodium oleate for cold rolled steel in hydrochloric acid media

作　　者：李向红[1] 邓书端[2] 白玮[3] 付惠[1] 木冠南[4] 

机构地区：[1]西南林学院基础部,云南昆明650224 [2]西南林学院木质科学与装饰工程学院,云南昆明650224 [3]云南民族大学化学与生物技术学院,云南昆明650031 [4]云南大学化学系,云南昆明650091

出　　处：《云南大学学报（自然科学版）》2009年第2期177-182,共6页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(50261004);西南林学院重点科研基金项目(110605);云南省教育厅基金资助项目(06Y073A)

摘　　要：用失重法和动电位极化曲线法研究了阴离子表面活性剂油酸钠(SO)对冷轧钢在1.0 mol/L HCl介质中的缓蚀作用.结果表明:油酸钠对冷轧钢具有良好的缓蚀作用,为混合抑制型缓蚀剂,缓蚀率随油酸钠的质量浓度增加而增大;油酸钠在钢表面的吸附符合校正的Langmuir吸附模型.通过吸附理论和动力学Arrhenius公式分别求出了相应的吸附热力学参数(吸附自由能ΔG0,吸附热ΔH0,吸附熵ΔS0)和动力学参数表观活化能Ea,并根据这些参数详细讨论了缓蚀作用机理.The inhibition effect of anionic surfactant of sodium oleate （SO） on the corrosion of cold rolled steel （CRS） in 1.0 mol/L HCl solution was investigated by weight loss and potentiodynamic polarization methods. The results show that sodium oleate is a good inhibitor in 1.0 moL/L HCl. Inhibition efficiency increases with increasing the inhibitor concentration. Polarization curves show that sodium oleate is a mixed - type inhibitor in hydrochloric acid. The adsorption of SO on CRS surface obeys the amended Langmuir adsorption isotherm equation. The experimental data have been treated with adsorption theory and kinetic Arrhenius equation. Three adsorption thermodynamic parameters （adsorption free energy △G^0, adsorption heat △H^0, adsorption entropy △S^0） and kinetic parameter of apparent activation energy Ea are also calculated. Based on the parameters, the inhibitive mechanism was discussed in detail.

关 键 词：钢 油酸钠 盐酸 吸附 缓蚀 

分 类 号：TG174.42[金属学及工艺—金属表面处理]