SOME THIAZOLE DERIVATIVES AS INHIBITORS FOR CORROSION OF C-STEEL IN ACIDIC SOLUTIONS

Abstract

The effect of thiazole derivatives as corrosion inhibitors of C-steel in 2M hydrochloric acid solution has been studied by weight-loss and galvanostatic polarization techniques. A significant decrease in the corrosion rate of C-steel was observed in the presence of these investigated inhibitors. This study revealed that, the inhibition efficiency increases with increasing the inhibitor concentration but decreases with increasing the temperature. The effect of some divalent cations (Cu2+, Ni 2+, Co 2+ and Ca2+) to improve the inhibition efficiency of these inhibitors is studied and it is found that the presence of these cations improves the inhibition efficiency. From the galvanostatic polarization technique, the inhibition efficiency of the inhibitors is emphasized the results which obtained from the weight-loss technique. The adsorption of these inhibitors on C-steel surface has been found to obey the Frumkin's adsorption isotherm in both techniques. The mechanism of inhibition was discussed in the light of the chemical structure of the undertaken inhibitors.