In this work, we studied the effect of inhibition of Sulfaguandine(SFG) against corrosion of the carbon steel in
hydrochloric acid 1.0M HCl. For this, we used the weight loss measurements and electrochemical methods such as
potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Results obtained revealed that
SFG performed excellently as a corrosion inhibitor for carbon steel in hydrochloric acid solution. Inhibition
efficiency increases with increase in concentration of SFG. The efficiency reaches a maximum value of 95.71% at
5×10-3M. Electrochemical methods show that it acts as mixed-type inhibitor with predominant cathodic action. The
SFG admits as the Langmuir adsorption. The thermodynamic activation parameters for the corrosion reaction were
calculated and discussed in relation to the stability of the protective inhibitor layer. Attempt to correlate the
molecular structure to quantum chemical indices was made using density functional theory (DFT).

Keywords: Sulfaguanidine inhibitor, Carbon steel, 1.0M HCl, EIS, Polarization, DFT.

Title

Der Pharmacia Lettre

Publisher

scholars research library

Publisher Country

United Kingdom

Indexing

Scopus

Impact Factor

None

Publication Type

Both (Printed and Online)

Volume

8

Year

2016

Pages

65-76