Inhibition of Mild Steel Corrosion in Sulfuric Acid Solution by 2-Hydropyrimidine-2-Thione Derivative

Document Type: Research Paper

Authors

1 Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran Young Researchers and Elite Club, Kerman Branch, Islamic Azad University, Kerman, Iran

2 Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran

3 Department of New Materials, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran

4 Department of Materials Science and Metallurgy, Shahid Bahonar University of Kerman, Kerman, Iran

Abstract

The corrosion inhibition potential and efficacy of 2-hydropyrimidine-2-thione derivative on mild
steel in 0.5 M sulfuric acid solution was investigated using electrochemical polarization and FTIR
spectroscopic techniques. In addition, docking studies were carried out as theoretical investigation
of adsorption inhibitor on iron surface. The results of polarization studies indicate the exceptionally
strong efficiency of this compound as an inhibitor in H2SO4 solution. The electrochemical studies to
elucidate the mechanism indicated adsorption obeying the Langmuir isotherm to be the main mode
of action. The FTIR results indicated the presence of inhibitor molecules to formation protective
layer on the surface of mild steel. Theoretical findings show that the most stable states of
compound/iron system are via the molecular sites containing S atoms, ester groups and aromatic
rings.

Keywords