Abstract

R. T. Vashi^1*, H. M. Bhajiwala¹ and S. A. Desai²

The inhibition effect of ethanylamines on corrosion of zinc in (HNO3 + H2SO4) binary acid mixture has been studied. In mix acid, corrosion rate increases with the concentration of mix acid and with the temperature. At constant mix acid concentration, the inhibition efficiency (I.E.) of ethylamines increases with the inhibitor concentration. Similarly, at constant inhibitor concentration, the I.E. increases with the increase in concentration of mix acid. At all inhibitor concentration in binary acid mixture at 301 K for 24 h immersion period, the I.E. of inhibitors decreases in the order : Ethylamine > Diethylamine > Triethylamine. As temperature increases, percentage of inhibition decreases. The value of activation energy and free energy of adsorption have also been calculated. Anodic and cathodic galvanostatic polarization show little anodic but significant cathodic polarization.

Corrosion; Zinc; Nitric and Sulphuric acid mixture; Ethylamines

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