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Effect of 2-Mercaptobenzimidazole Concentration on Electrochemical Behavior of Brass (Cu–40Zn) Surface in Acid Medium

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Abstract

Electrochemical behavior of brass electrode (Cu–40Zn) in oxalic acid solution was studied in the absence and presence of organic inhibitor 2-Mercaptobenzimidazole (2-MBI) with different concentrations at ambient temperature using voltammetry, general corrosion (Rp) and electrochemical impedance spectroscopy (EIS). The results showed that the electrochemical behavior of brass surface is similar to the copper one in the same conditions and revealed also the absence of the complexity phenomenon between the brass and the oxalate. Evolution of abandonment potential presents two different behaviors of electrode surface according to the concentration of organic inhibitor (2-MBI). Polarization curves showed that the addition of organic inhibitor (2-MBI) decreases the current density and shifts the anodic and cathodic branches towards more positive and more negative potentials. The plot of C/θ against the inhibitor concentration (C) shows that (2-MBI) strongly physisorbed on the brass electrode according to Langmuir isotherm. Measurements of polarization resistance and impedances show that the optimal concentration of the inhibitor is (0.5 mM) which gives a protection rate exceeds 89%.

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Abbreviations

E:

Potential

i:

Current density

R:

Perfect gas constant

T:

Temperature

C:

Concentration

v:

Scan rate

2 MBI:

2-Mercaptobenzimidazol

Ecorr :

Corrosion potential

icorr :

Corrosion current density

Rp :

Polarization resistance

Rtc :

Charge transfer resistance

Rel :

Electrolyte resistance

Cd :

Double layer capacitance

Zreal :

Real part of impedance

Zim :

Imaginary part of impedance

f:

Frequency

P %:

Protection rate

K:

Equilibrium constant

\(\Delta G_{ads}^{0}\) :

Adsorption standard enthalpy

E%:

Inhibition efficiency

\(\beta a\) :

Anodic coefficient transfer

\(\beta c\) :

Cathodic coefficient transfer

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Authors and Affiliations

  1. Inorganic Materials Laboratory, Department of Chemistry, Faculty of Sciences, Mohamed Boudiaf-M’sila University, 28000, M’sila, Algeria

    Oualid Dilmi

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Dilmi, O. Effect of 2-Mercaptobenzimidazole Concentration on Electrochemical Behavior of Brass (Cu–40Zn) Surface in Acid Medium. Chemistry Africa 1, 145–154 (2018). https://doi.org/10.1007/s42250-018-0019-3

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