Abstract
The corrosion inhibition of mild steel in 0.5 M sulfuric acid by two newly synthesized Schiff bases namely, 4-X-2-{[2-(2-pyridin-2-yl-ethylsulfanyl) ethylimino] methyl}-phenol [X = –NO2 (S1) and –OMe (S2)] has been investigated in the temperature range 298–318 K using Tafel polarization and electrochemical impedance spectroscopy (EIS) methods. The inhibition efficiency of both S1 and S2 increases with increase in inhibitor concentration. The variation in inhibition efficiency depends on the type of functional group substituted in the benzene ring. It was found that the presence of the methoxy group in the Schiff base (S2) better facilitates the adsorption of molecules on the surface than is the case with S1. Tafel polarization showed that both Schiff bases are mixed corrosion inhibitors. The Temkin isotherm was found to provide an accurate description of the adsorption behavior of the Schiff bases. Calculation of thermodynamic parameters such as ΔGads0, ΔHads0 and ΔSads0 shows that the inhibitive action of the inhibitors is in the following order S1 < S2.
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