Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (1): 36-41.doi: 10.3969/j.issn.1000-565X.2011.01.007

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

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)

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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