Corrosion inhibition of AISI 1020 steel based on tungstate anion and amoxicillin as corrosion inhibitors in 0.05 mol l⁻¹NaCl solution or inserted into cellulose acetate films

Abstract

Sodium tungstate and amoxicillin were used separately or combined in a solution containing 0.05 mol l À1 NaCl or inserted into cellulose acetate films as a corrosion inhibition method for American Iron and Steel Institute (AISI) 1020 steel. The electrochemical behavior of AISI 1020 steel was characterized using open-circuit potential, anodic polarization and electrochemistry impedance spectroscopy. The inhibitor effect of tungstate anions was proved, and its combination with amoxicillin was considered inferior when tungstate was used alone. This behavior was attributed to weaker adsorption of amoxicillin when compared with the adsorption of tungstate anion both deposited on the alloy and into the cellulose acetate film on the steel.