苯并三氮唑和磷酸钠对锌的协同缓蚀

Synergistic Inhibition of Zinc Corrosion by Benzotriazole in Combination with Sodium Phosphate

采用静态失重法、动电位极化曲线法、电化学交流阻抗法、扫描电镜和X射线光电子能谱等方法,研究了在质量分数为17%(0.534mol/L)的四丁基溴化铵(TBAB)溶液中,苯并三氮唑(BTA)和Na3PO4(SP)单独和复配使用对锌腐蚀的抑制作用.结果表明,BTA和Na3PO4及其复配物对TBAB溶液中的锌具有缓蚀作用,BTA和Na3PO4对锌的缓蚀效率随缓蚀剂质量浓度的增大而提高;0.1g/L的BTA和1g/L的Na3PO4的复配物的缓蚀效率高于93%.文中还结合扫描电镜和X射线光电子能谱的结果对复配物的缓蚀机理进行了讨论,二者的协同效应在于Na3PO4在锌的表面形成含有ZnO、Zn(OH)2和Zn3(PO4)2的保护层,BTA吸附在该保护层的表面或者是镶嵌在保护层的内部.

The inhibition behaviors of benzotriazole（BTA）,sodium phosphate（SP） and their mixture on zinc corrosion in 17%（0.534 mol/L） aqueous tetra-n-butylammonium bromide（TBAB） solution were investigated by means of static weight-loss test,potentiodynamic polarization curve method,electrochemical impedance spectroscopy（EIS）,SEM and XPS.The results indicate that BTA,SP and their mixture all protect zinc from corrosion in aqueous TBAB solution,with an inhibition efficiency increasing with BTA or SP content,and that the mixture consisting of 0.1 g/L BTA and 1 g/L SP is of an inhibition efficiency higher than 93%.Moreover,according to the results of SEM and XPS,it is found that the synergistic inhibition of zinc corrosion by benzotriazole in combination with SP is due to not only the formation of the protective film containing ZnO,Zn（OH）2 and Zn3（PO4）2 on the electrode surface but also the adsorption of BTA on the film surface or the inserting of BTA in the film.