Synergistic inhibition effect of Diantipyrylmethane and Potassium thiocyanate on mild steel corrosion in 1 M HCl solution

摘要

The inhibition effect of Diantipyrylmethane (DAM) and its synergistic effect with potassiumthiocyanate (KSCN) on mild steel corrosion in 1 M HCl solution were investigated by electrochemicalmethods, gravimetric analysis and scanning electron microscopy (SEM). The experiment results showthat the inhibition efficiency increases with the concentration of DAM alone and increases further withthe presence of 2 mM KSCN. The synergism parameters demonstrate that DAM cation has asignificant synergistic effect with thiocyanate anion, which is agree with the correspondingthermodynamic and kinetic parameters. The results of quantum chemical calculation confirm that thedication structure of DAM molecule in acid medium plays a vital role during corrosion inhibition ofmild steel.