Four schiff bases, namely 4-((thiophene-2-yl) methyleneamino) phenyl sulphonamide (I), N,N’-bis((thiophene-2 yl)methylene)benzene-1,2-diamine (II), (2E)-2-((5-((E)-(2-hydroxyphenylimino) methyl)thiophene-2- yl)methyleneamino) phenol (III) and 2-(5-methoxy-2-hydroxy benzylidene amino) phenol(IV) were synthesized. The chemical structures of the products were confirmed by FT-IR, 1H NMR, UV-Vis, mass spectral and elemental analyses techniques. Corrosion inhibition of the schiff bases were evaluated using weight loss and quantum chemical methods in a 0.1MHCl solution for mild steel. The Schiff bases had exhibited a good inhibitory action against corrosion of mild steel in the medium investigated. For further confirmation of the result, the values of inhibition efficiency obtained from weight loss measurements were correlated with theoretical values obtained through DFT calculations. The results were in a good agreement with the order of inhibition efficiency of the Schiff bases obtained from experimental results.
