The inhibition effect of Sulfamethazine (SFMT) on the corrosion of mild steel in 2.0 M phosphoric acid has been
investigated by weight loss, polarization potentiodynamic and electrochemical impedance spectroscopy (EIS).
SFMT is able to reduce the corrosion of steel effectively in phosphoric acid. Results obtained revealed that these
compounds are good mixed-type inhibitors without changing the mechanism of the corrosion process. The effect of
temperature on the corrosion behavior of mild steel in phosphoric acid with addition of SFMT was studied in the
temperature range 298–328 K. The studied compounds appeared to function through general adsorption following
the thermodynamic–kinetic adsorption isotherm. The thermodynamic and activation parameters were determined
and discussed. Quantum chemical calculations were applied to theoretically determine the relationship between
molecular structure and inhibition efficiency.

Keywords: Mild steel; Corrosion inhibition; Phosphoric acid; DFT; EIS

Title

ARCHIVES OF APPLIED SCIENCE RESEARCH

Publisher

Scholars Research Library

Publisher Country

United States of America

Publication Type

Both (Printed and Online)

Volume

8

Year

2016

Pages

126-137