Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (12): 2565-2572.doi: 10.3866/PKU.WHXB201310294

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Surface-Enhanced Infrared Absorption Spectroscopy Study of Anticorrosion Behavior of 2-Mercaptobenzothiazole on Copper

HUO Sheng-Juan, CHEN Li-Hong, ZHU Qing, FANG Jian-Hui   

  1. Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, P. R. China
  • Received:2013-08-26 Revised:2013-10-28 Published:2013-11-28
  • Contact: HUO Sheng-Juan E-mail:huoshengjuan@shu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21103105) and Foundation for University Youth Teachers by the Shanghai Education Committee, China.

Abstract:

2-Mercaptobenzothiazole (MBT) is a highly efficient inhibitor of Cu. However, the inhibition mechanism is still unclear. In this paper, the anticorrosive effect of MBT on a Cu surface at the macroscopic level was evaluated using a polarization curve technique. The potential-dependent adsorption geometries of MBT at the molecular level were investigated using electrochemical surface-enhanced infrared reflection absorption spectroscopy in attenuated total reflection mode, together with theoretical calculations. The results indicated that the MBT molecules were adsorbed on the Cu surface vertically, in a thiolate form, through exocyclic S atoms at a potential negative of 0 V (vs saturated calomel electrode (SCE)). At a potential positive of 0 V (vs SCE), electrons were transferred between MBT and the Cu substrate, meaning that MBT molecules can interact with the Cu surface via exocyclic S and endocyclic N atoms to form a polymer film, resulting in the formation of a compact protecting layer to prevent Cu dissolution.

Key words: Surface-enhanced infrared absorption spectroscopy, Attenuated total reflection (ATR) mode, 2-Mercaptobenzothiazole, Copper, Inhibition mechanism

MSC2000: 

  • O646