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Citation: SU Tiejuna, LI Kehua, LUO Yunbai. Inhibition Behavior of 1-Phenylaminomethylbenzimidazole for Mild Steel in Hydrochloric Acid[J]. Chinese Journal of Applied Chemistry, ;2015, 32(4): 464-471. doi: 10.11944/j.issn.1000-0518.2015.04.140292 shu

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

SU Tiejuna ^a,, ,
LI Kehua ^b ,
LUO Yunbai ^c

1.
a College of Technology and Engineering, Yangtze University, Jingzhou, Hubei 434020, China;
2.
b College of Chemistry and Environmental engineering, Yangtze University, Jingzhou, Hubei 434020, China;
3.
c College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China

Corresponding author: SU Tiejuna,
Received Date: 25 August 2014
Available Online: 16 December 2014
Fund Project: 长江大学工程技术学院科技创新基金(13J0603) (13J0603)

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.
- corrosion inhibitor,
- mass loss,
- potentiodynamic polarization,
- impedance,
- quantum chemistry calculation
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