The corrosion inhibition properties of 2-(2-Pyridyl) benzimidazole (PB) for C38 steel in HCl 1M solution were analysed
by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods. The protection efficiency
increases with increasing inhibitor concentration to attain 98.8 % at 2.10-4M. Potentiodynamic polarization data
suggests mixed-mode of corrosion inhibition with predominant control of cathodic reaction. The studied inhibitor follows
Langmuir adsorption isotherm. Data, obtained from EIS measurements, were analyzed to model the corrosion inhibition
process through appropriate equivalent circuit model; a constant phase element (CPE) has been used. The effect of
temperature on the corrosion behavior of C38 steel in 1 M HCl, with the addition of PB was also studied and it can be
regarded as temperature-independent inhibitor. The activation energy as well as other thermodynamic parameters for the
inhibition process was calculated and discussed. The results obtained showed that the PB could serve as an effective
inhibitor of the corrosion of C38 steel in hydrochloric acid solution. Quantum chemical parameters were calculated using
ab initio and DFT methods to find a good correlation with the inhibition efficiency. A good correlation was found between
the theoretical calculations and experimental observations.
 

Title

shehdeh jodeh

Publisher

derpharmachemica

Publisher Country

Canada

Indexing

Scopus

Impact Factor

None

Publication Type

Both (Printed and Online)

Volume

8

Year

2016

Pages

22-25