摘要
用失重法、动电位极化曲线和原子力显微镜(AFM)研究了红四氮唑对冷轧钢在1.0mol/L～10.0mol/L H_3PO_4溶液中的缓蚀作用。结果表明:红四氮唑对冷轧钢具有中等程度的缓蚀作用,为混合抑制型缓蚀剂,且在钢表面的吸附符合Freundlich吸附模型;通过吸附热力学和腐蚀动力学公式分别求出了相应的吸附热力学参数和动力学参数,并根据这些参数详细讨论了缓蚀作用机理;AFM测试结果表明添加红四氮唑后钢表面较为平整,粗糙度降低。
The inhibition effect of red tetrazolium on the corrosion of cold rolled steel （CRS） in 1.0 mol/L-10.0 mol/L H3PO4 solution has been studied by mass loss and potentiodynamic polarization methods. Atomic force microscope （AFM） provided the CRS surface conditions. The results show that neutral red tetrazolium is a moderate inhibitor for CRS. Inhibition efficiency increases with the inhibitor concentration, while decreases with increasing the temperature. The adsorption of red tetrazolium on the CRS surface follows the Freundlich adsorption isotherm equation. The experimental data have been treated with adsorption thermodynamic and corrosion kinetic equations. Three adsorption thermodynamic parameters （adsorption free energy △G^O, adsorption heat △H^O, adsorption entropy △S^O） and two kinetic parameters （corrosion rate constant k, kinetic reaction constant B） are also calculated. The inhibitive mechanism is discussed in detail according to the parameters. The results show that the adsorption process is a spontaneous and exothermic process accompanied by a decrease in entropy. The corrosion of cold rolled steel in H3PO4 support the kinetic equation proposed by Mathur and Vasudevan. The rate constant k and kinetic reaction constant B decreased after adding red tetrazolium. Polarization curves show that red tetrazolium is a mixed-type inhibitor, and its inhibition on CRS is caused by geometric blocking effect. AFM results show that the introduction of red tetrazolium into H3PO4 solution results in decreasing the surface roughness.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2009年第6期447-452,458,共7页
Journal of Chinese Society For Corrosion and Protection
基金
云南省教育厅基金项目(06Y073A)
西南林学院重点科研基金项目(110605)资助
关键词
磷酸
冷轧钢
红四氮唑
缓蚀
吸附
原子力显微镜
phosphoric acid
cold rolled steel
red tetrazolium
inhibition
adsorption
atomic force microscope
作者简介
李向红，男，1981年生，硕士，副教授，研究方向为缓蚀剂 通讯作者：李向红，E—mail：xianghong-li@163．com
