Benzylidene Schiff Base Corrosion Inhibition and Electrochemical Studies of Mild Steel in 1M HCI and 0.5M H2SO4 Acidic Solutions

Abstract

N ̶ Benzylidene ̶ 4 ̶ Methoxyaniline (NB4MA) schiff base was synthesized and investigated corrosion behavior of mild steel (MS) in 1M HCI and 0.5M H2SO4. The corrosion efficiency studied by means of mass loss and electrochemical techniques. The electrochemical studies confirm that Ecorr displacement about 32mV confirms anodic and cathodic type of inhibitor. The positive direction of corrosion potential curves confirmed that adsorption efficiency on metal surface. Langmuir adsorption isotherm was observed. Electrochemical impedance studies (EIS) exposed that inhibition effectiveness enlarged with even increasing concentration of Schiff base and found inhibition capacity 90 – 95%. Furthermore, thermodynamic parameters of adsorption were found which elaborates that increasing ΔG0ads parameter since favorable interaction behavior between mild steel and inhibitor causes efficient adsorption. The morphology studies revealed that synthesized Schiff base has strong affinity to adhere on mild steel and improve corrosion efficiency against acidic media. The quantum chemical parameter also confirmed that electrons distribution and efficiency of Schiff base.