Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (4): 464-471.DOI: 10.11944/j.issn.1000-0518.2015.04.140292

• Full Papers • Previous Articles     Next Articles

Inhibition Behavior of 1-Phenylaminomethylbenzimidazole for Mild Steel in Hydrochloric Acid

SU Tiejuna, *, LI Kehuab, LUO Yunbaic   

  1. aCollege of Technology and Engineering
    bCollege of Chemistry and Environmental engineering, Yangtze University,Jingzhou,Hubei 434020,China
    cCollege of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China
  • Received:2014-08-25 Published:2015-04-10 Online:2015-04-10
  • Contact: Corresponding author:SU Tiejun, lecturer; Tel:0716-8067596; E-mail:sutj@qq.com; Research interests:oilfield chemistry and protection of metal corrosion
  • Supported by:

    Supported by Yangtze University College of Technology and Engineering Innovation Foundation(13J0603)

Abstract:

The inhibition effect and adsorption behavior of 1-phenylaminomethylbenzimidazole (PAB) for N80 steel in HCl solution were investigated by mass-loss test, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The inhibition efficiency increased with higher concentration of PAB and decreased with elevated temperature. Polarization curve reveals that PAB is a mix-type inhibitor. The adsorption between PAB and N80 steel surface is a spontaneous, exothermic and entropy increasing process fitting Langmuir isotherm. The relationship between the molecular structure of PAB and the inhibition efficiency was investigated using quantum chemical calculations.

 

Key words: corrosion inhibitor, mass loss, potentiodynamic polarization, impedance, quantum chemistry calculation

CLC Number: