Corrosion Inhibition Performance of Azure A on Mild Steel in Sulphuric Acid Medium

The inhibitive action of azure A (AA) against the corrosion of mild steel (MS) in 0.5 M H2SO4 solution was studied by gravimetric and electrochemical techniques. The inhibition efficiency increased with increase in concentration of AA. The adsorption of AA on mild steel surface obeys Langmuir adsorption isotherm. Polarization measurements showed that the studied inhibitor is mixed type with significant reduction of cathodic and anodic current densities. Electrochemical impedance spectroscopy measurements revealed that the charge transfer resistance increases with increase in the concentration of AA. Various thermodynamic and adsorption parameters are evaluated and discussed. The inhibition efficiency of AA synergistically increased by the addition of KI. The relation between inhibition efficiency and molecular structure of AA is discussed by considering quantum chemical parameters

Author(s): S. S. Shivakumar and K. N. Mohana

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