华南理工大学学报(自然科学版) ›› 2011, Vol. 39 ›› Issue (1): 36-41.doi: 10.3969/j.issn.1000-565X.2011.01.007

• 化学化工 • 上一篇    下一篇

苯并三氮唑和磷酸钠对锌的协同缓蚀

柳松1 钟燕1 蒋荣英1 肖睿2 冯自平2   

  1. 1.华南理工大学应用化学系,广东广州510640;2.中国科学院广州能源研究所,广东广州510640
  • 收稿日期:2010-05-21 修回日期:2010-09-08 出版日期:2011-01-25 发布日期:2010-12-01
  • 通信作者: 柳松(1967一),男,博士,副教授,主要从事应用电化学、纳米化学研究 E-mail:chsliu@scut.edu.cn
  • 作者简介:柳松(1967一),男,博士,副教授,主要从事应用电化学、纳米化学研究
  • 基金资助:

    国家自然科学基金委员会一广东省人民政府自然科学联合基金资助项目(U0634005)

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

Liu Song1 Zhong Yan1 Jiang Rong-ying1 Feng Zi-ping2 Xiao Rui2   

  1. 1.South China university of technology of applied chemistry, guangdong guangzhou 510640;  2.Guangzhou energy research institute of the Chinese academy of sciences, guangdong guangzhou 510640
  • Received:2010-05-21 Revised:2010-09-08 Online:2011-01-25 Published:2010-12-01
  • Contact: 柳松(1967一),男,博士,副教授,主要从事应用电化学、纳米化学研究 E-mail:chsliu@scut.edu.cn
  • About author:柳松(1967一),男,博士,副教授,主要从事应用电化学、纳米化学研究
  • Supported by:

    国家自然科学基金委员会一广东省人民政府自然科学联合基金资助项目(U0634005)

摘要: 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.

关键词: 锌, BTA, Na3PO4, 缓蚀剂, 四丁基溴化铵

Abstract:

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.

Key words: zinc, benzotriazole, sodium phosphate, corrosion inhibitor, synergism