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2, 4‐Dinitrophenylhydrazine as a Corrosion Inhibitor for Copper in Sulphuric Acid

S. Siddagangappa, S.M. Mayanna, F. Pushpanadan

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 August 1976

36

Abstract

Corrosion rates of copper in 1N sulphuric acid with various concentrations (10−8 to 10−4 M) of 2, 4‐dinitrophenylhydrazine (2, 4‐DNP) are determined by weight loss method. The corrosion rates (under diffusion control), are a function of the stirring rate and the concentration of 2, 4‐DNP. The corrosion rate decreased markedly on increasing the concentration of 2, 4‐DNP. The maximum corrosion inhibition (85%) is observed at 10−4 M 2, 4‐DNP. The anodic polarization data and the drift in corrosion potential with time towards the less noble direction reveal the inhibition of cathodic reaction of the corrosion process by 2, 4‐DNP. A mechanism is proposed to explain the inhibitor action of 2, 4‐DNP on copper during corrosion in 1N sulphuric acid.

Citation

Siddagangappa, S., Mayanna, S.M. and Pushpanadan, F. (1976), "2, 4‐Dinitrophenylhydrazine as a Corrosion Inhibitor for Copper in Sulphuric Acid", Anti-Corrosion Methods and Materials, Vol. 23 No. 8, pp. 11-13. https://doi.org/10.1108/eb007013

Publisher

:

MCB UP Ltd

Copyright © 1976, MCB UP Limited

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