ELECTROCHEMICAL AND THEORETICAL STUDIES INFLUENCING THE EFFECT OF HYDROXYL POSITION OF TETRAPHENOLIC SCHIFF BASES TOWARDS CORROSION INHIBITION OF MILD STEEL IN 1M HCL
Keywords:Mild steel, Tetrahydroxylated H2Salen, Corrosion inhibitors, AFM and SEM images, DFT-calculations and molecular dynamic simulations.
AbstractThree Schiff bases, derived from N,N-bis(salicylidene)-4,4â€™-diphenylmethane in which second hydroxyl, is introduced in 3,4 and 5 positions of salicylaldehyde were synthesized, characterized and studied as inhibitors for mild steel in 1M HCl medium. The experiments were performed using potentiodynamic polarization. This inhibition proved an efficient increase according the position of second hydroxyl of salicylaldehyde suggesting that this inhibition is dependent on concentration and the compound nature. Among these position-isomers, the best inhibition efficiency was obtained with p-hydroxylated (94%) at 1mM. Tafel plots of these inhibitors are the mixed- type, their adsorption is spontaneous obeying to Langmuirâ€™s isotherm. AFM/SEM-EDS characterized metal surface. DFT-calculations and molecular dynamics simulations are correlated to inhibition efficiency obtained.
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