Abstract
abStract The corrosion inhibition by two synthesized Schiff -bases of bis-(2-hydroxy-3-methoxy)-1,6-diaminohexane salicyladimine and bis- (2-hydroxy)- 1,6-diaminohexane salicyladimine was investigated by weight loss, Tafel polarization and AC impedance on low alloy steel in 1M HCl. The results show that these Schiff –bases act as anodic type inhibitors. The inhibition efficiency obtained from all method employed are in good agreement. Changes in impedance parameters (R t and C dl ) are indicative of adsorption of Schiff-bases on the metal surface leading to the formation of protective film. Two Schiff-bases are found to adsorb on low alloy steel surface according to the Langmuir adsorption isotherm and thermodynamics calculations revealed that bis-(2-hydroxy-3-methoxy)-1,6-diaminohexane salicyladimine had larger adsorption constant and more negative free energy of adsorption than bis-(2-hydroxy)-1,6-diaminohexane salicyladimine. Keywords : Low alloy steel; Schiff –bases; Langmuir ; Inhibition Efficiency.
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