Volume No. 9 Issue No.: 2 Page No.: 368-374 October-December 201

 

ANISIDINE ISOMERS AS CORROSION INHIBITORS FOR ZINC IN HYDROCHLORIC ACID

 

Vashi R. T.* and Desai Krunal

Department of Chemistry, Navyug Science College, Surat (INDIA)

 

Received on : July 10, 2014

 

ABSTRACT

 

The corrosion of zinc in hydrochloric acid containing anisidines has been studied at different acid concentration and temperature. Corrosion increases with increase of acid concentration and temperature. As concentration of acid increases corrosion rate increases while Inhibition Efficiency (I.E.) of anisidines decreases. As concentration inhibitor increases I.E. also increases. At 20 mM inhibitor concentration in 0.01 M HCl at 301oK for 24 h immersion period, the efficiency of inhibitors decreases in the order : o-anisidine (98.35 %) > p-anisidine (97.80 %) > m-anisidine (96.71 %). As the temperature increases, the value of ?Ga increases, while percentage of inhibition decreases. The mode of inhibition action appears to be chemisorption since the plot of log ( ? / 1-? ) versus log C gave a straight line, which suggested that the inhibitors covered both the anodic and cathodic regions through general adsorption following the Langmuir isotherm. Anodic and cathodic galvanostatic polarisation curves show polarization of both anode and cathode.

 

Keywords : Corrosion, Zinc, Hydrochloric Acid, Anisidines, Golvano static poaristation

 

 

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