Corrosion inhibition of mild steel by some antipyrinyl derivatives: Synthesis and Characterization o

This book reported an introduction of corrosion monitoring techniques, methods of corrosion control, corrosion inhibitors, adsorption isotherms and inhibitors for steel in acid medium. Some antipyrinyl derivatives were synthesized from the reaction of enaminonitrile with 1-nitroso-2-naphthol and salicyaldehyde, respectively and used to protect mild steel dissolution in 1.0 M HCl solutions using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy measurements. It was shown that these inhibitors act as good corrosion inhibitors for mild steel protection. The inhibition efficiencies were attributed to the simple blocking effect by adsorption of inhibitor molecules on the mild steel surface. The results showed that inhibitors acts as a mixed type inhibitor. Relationship between molecular structure and their inhibition efficiency was elucidated by quantum chemical calculations.