采用失重法、电化学极化曲线、电化学交流阻抗和扫描电镜(SEM)等方法, 研究了在17 wt% (0.534 mol l-1) 四丁基溴化铵(TBAB)溶液中, 苯并三氮唑(BTA)和Na3PO4 (SP)单独和复配使用时对锌腐蚀的抑制作用. 添加缓蚀剂后, 腐蚀电流密度减小, 电化学反应电阻变大, 表明BTA和Na3PO4以及复配物对锌在TBAB溶液中具有缓蚀作用. 研究发现, BTA与Na3PO4的缓蚀协同作用显著. 0.1 g l-1 BTA和1 g l-1 Na3PO4复配的缓蚀效率高于93% (由不同的测试方法均可得到).两者复配的缓蚀机理可能是Na3PO4在锌的表面形成含有ZnO、Zn(OH)2和Zn3(PO4)2的保护层, 而BTA可以吸附在该保护层的表面或者是镶嵌在保护层的内部, 从而增加了对锌的保护能力.

The corrosion inhibition behavior of benzotriazole (BTA), Na3PO4 (SP) and their mixture on zinc in 17 wt% (0.534 mol l-1) tetra-n-butylammonium bromide aqueous solution was investigated by weight-loss test, potentiodynamic (Tafel) polarization measurement, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) techniques. After addition of inhibitor(s) into the TBAB aqueous solution the corrosion current density decreased and the charge transfer resistance increased, indicating that BTA or Na3PO4 or inhibitor mixture could protect zinc in aqueous TBAB solution. It was observed that the synergistic protection effect of BTA and Na3PO4 was evident. The formulation consisting of 0.1 g l-1 BTA and 1 g l-1 Na3PO4 had more than 93% corrosion inhibition efficiency calculated according to different methodologies. The main function of Na3PO4 seems to form the thin layer consisting of ZnO, Zn(OH)2 and Zn3(PO4)2, whereas BTA can stabilize this layer by incorporation into it or/and adsorption on it so that corrosion inhibition occurs after immersion of zinc into the solution containing both inhibitors.