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Corrosion Inhibition of Zinc by a New Inhibitor in Hydrochloric Acid Medium

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Author Affiliations

  • 1Department of Chemistry, Jawaharlal Nehru National College of Engineering, Shivamogga-577204, Karnataka, INDIA
  • 2Department of Chemistry, Srinivasa School of Engineering, Mukka, Mangalore, Karnataka, INDIA
  • 3Nanotechnology and Catalysis Research Centre [NANOCAT], IPS Building, Universiti Malaya, 53100, Kuala Lumpur, MALAYSIA

Res.J.chem.sci., Volume 3, Issue (11), Pages 82-89, November,18 (2013)

Abstract

Electrochemical reduction of nitrobenzotriazole was carried out on lead cathode in acidic ethanol medium. The catholyte containing the reduced compound was used as corrosion inhibitor for zinc in hydrochloric acid medium. The inhibition efficiency of the catholyte was studied by weight loss and potentiodynamic polarization methods. The optimum amount of catholyte required for maximum corrosion inhibition was established. The wieght loss of zinc was decreased with increase in the concentration of inhibitor. The OCP of zinc shifted towards more cathodic direction indicating the increase of hydrogen over voltage and decrease of metal dissolution. The protection efficiency was increased with increase in inhibitor concentration and also with time indicating the progressive adsorption of reduced compounds of the catholyte. The mechanism of adsorption follows Temkins adsorption isotherm. The SEM images of zinc and corroded zinc surfaces showed the effectiveness of the catholyte in hindering the corrosion process.

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