Ethanolamines as corrosion inhibitors for zinc in (HNO3 + H2SO4) binary acid mixture

Abstract: This work deals with the study of corrosion behaviour for zinc in (HNO 3 + H 2 SO 4 ) binary acid mixture containing ethanolamines. Corrosion rate increases with concentration of acid and temperature. At constant acid concentration, the inhibition efficiency of ethanolamines increases with the inhibitor concentration. Value of ∆Ga increases and inhibition decreases with temperature. The mode of inhibition action appears to be chemisorption

INHIBITION OF CORROSION OF ZINC IN (HNO3 + HCl) ACID MIXTURE BY ANILINE

Corrosion of Zinc metal in (HNO3 + HCl) binary acid mixture and inhibition efficiency of aniline has been studied by weight loss method and polarization technique. Corrosion rate increases with the concentration of acid mixture and the temperature. Inhibition efficiency (I.E.) of aniline increases with the concentration of inhibitor while decreases with the increase in concentration of acid. As temperature increases corrosion rate increases while percentage of I.E. decreases. A plot of log (θ/1-θ) versus log C results in a straight line suggest that the inhibitor cover both the anodic and cathodic regions through general adsorption following Longmuir isotherm. Galvenostatic polarization curves show polarization of both anodes as well as cathodes

Ethanolamines as Corrosion Inhibitors for Zinc in (HNO3+H2SO4) Binary Acid Mixture

This work deals with the study of corrosion behaviour for zinc in (HNO3+ H2SO4) binary acid mixture containing ethanolamines. Corrosion rate increases with concentration of acid and temperature. At constant acid concentration, the inhibition efficiency of ethanolamines increases with the inhibitor concentration. Value of ΔGa increases and inhibition decreases with temperature. The mode of inhibition action appears to be chemisorption

INHIBITION OF CORROSION OF ZINC IN (HNO3 + HCl) ACID MIXTURE BY ANILINE

Corrosion of Zinc metal in (HNO₃ + HCl) binary acid mixture and inhibition efficiency of aniline has been studied by weight loss method and polarization technique. Corrosion rate increases with the concentration of acid mixture and the temperature. Inhibition efficiency (I.E.) of aniline increases with the concentration of   inhibitor while decreases with the increase in concentration of acid. As temperature increases corrosion rate increases while percentage of I.E. decreases. A plot of log (θ/1-θ) versus log C results in a straight line suggest that the inhibitor cover both the anodic and cathodic regions through general adsorption following Longmuir isotherm. Galvenostatic polarization curves show polarization of both anodes as well as cathodes

RT Vashi.pmd

ABSTRACT The inhibition effect of ethanylamines on corrosion of zinc in (HNO 3 + H 2 SO 4 ) 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