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Anti‐corrosion properties of bis(benzimidazole) derivatives for N80 steel in H 2 S solution
Author(s) -
Liu Lin,
Zhang Yue,
Yin Xiangyu,
Qian Jianhua
Publication year - 2013
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5187
Subject(s) - benzimidazole , corrosion , langmuir adsorption model , adsorption , dielectric spectroscopy , heteroatom , electrochemistry , dissolution , monolayer , chemistry , cathodic protection , metal , inorganic chemistry , nuclear chemistry , materials science , organic chemistry , electrode , ring (chemistry) , biochemistry
In this work, we systematically investigated the effect of four bis(benzimidazole) derivatives containing different heteroatoms in molecular structures on inhibiting corrosion of N80 steel in 0.5 mmol·l −1 H 2 S solution by potentiodynamic polarization, electrochemical impedance spectroscopy and metallographic microscope. The results showed that within the range of 0.1–1.0 mmol·l −1 , the adsorption of bis(benzimidazole) derivatives on N80 steel surface was found to follow Langmuir adsorption isotherm. Meanwhile, stable adsorbing monolayer between inhibitors and the metal surface was formed, which was confirmed by thermodynamic adsorption parameters ( K ads , Δ G ads 0 ). This series of bis(benzimidazole) derivatives exhibited obvious corrosion inhibitory properties for N80 steel. Moreover, they could both slow down the anodic dissolution of iron and the cathodic reduction reaction as mixed type corrosion inhibitors. The optimal inhibition efficiency was obtained for 1,3‐bis(benzimidazl‐2‐yl)‐2‐thiapropane (BBMS). Hopefully, this series of inhibitors might find applications in anti‐corrosion and many other areas. Copyright © 2012 John Wiley & Sons, Ltd.