Investigation on Corrosion Inhibition of Mild Steel by Sinapine Thiocyanate in H2SO4 Solution

Herein, the investigation on corrosion inhibition of mild steel in H2SO4 solution by green corrosion inhibitor of Sinapine Thiocyanate (GCI-ST) is presented. After GCI-ST isolated and purity determined, the corrosion inhibition of mild steel (MS) in H2SO4 solution with various concentration of GCI-ST was studied by potentiodynamic polarization, weight loss measurement and microstructure analysis. The study results indicate that GCI-ST can act as an effective green inhibitor, which is a mixed-type inhibitor, and the adsorption of GCI-ST on MS surface obeys Langmuir isotherm. In addition, it found that the inhibition efficiency increases with GCI-ST concentration increasing, decreases with H2SO4 concentration, temperature and storage time increasing.