INHIBITION OF ACID CORROSION OF PURE ALUMINUM WITH -BENZYLIDINE-1-METHYL-2-METHYLTHIO-IMIDAZOLE-4-ONE

Inhibition of aluminum corrosion in 0.5 M hydrochloric acid (HCl) solu tion by -benzylidine-1-methyl-2-methylthio-imidazole-4-one was tested using weight loss and polarization resistance measurements. Results of tests for weight loss, polarization resistance, and volume of hydroge n evolution (V-HE) indicated inhibitor efficiency (% P) increased with increasing inhibitor concentration, reaching a maximum inhibiting pow er of 82.5% at its highest values. The rate of aluminum corrosion incr eased with temperature in the absence and presence of the inhibitor. T he decrease in activation energy and increase in % P in the presence o f the inhibitor with increasing temperature were indicative of the che misorption of inhibitor molecules. The degree of surface coverage (the ta) increased with increasing temperature and increased linearly with the logarithm of the inhibitor concentration, fitting a Temkin isother m.