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Schiff?s Bases of Glutamic Acid and Aldehydes as Green Corrosion Inhibitor for Mild Steel: Weight- Loss, Electrochemical and Surface Analysis

Chandra Bhan Verma, M.A. Quraishi

In the present investigation, three Schiff’s bases (SBs) namely 2-(2-hydroxybenzylideneamino) heptanedioic acid (SB-1), 2-(4-(dimethylamino) benzylideneamino) heptanedioic acid (SB-2) and 2-(4-hydroxy-3- methoxybenzylideneamino) heptanedioic acid (SB-3) were synthesized and their corrosion inhibition properties on mild steel in 1M HCl has been investigated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Potentiodynamic polarization measurements indicate that SBs acts as mixed type corrosion inhibitors. The morphology of the mild steel surface was examined by scanning electron microscopy (SEM), and the surface composition was evaluated using energy-dispersive X-ray spectroscopy (EDX) to show the presence of SBs on the mild steel surface. The adsorption of SBs on the mild steel surface obeys Langmuir adsorption isotherm. Some thermodynamic and kinetic parameters also determined in relevance to describe the mechanism of adsorption