Journal of Chemistry

Toluidines as corrosion inhibitors for Zinc in Nitric Acid

Author & Affiliation:
R. T. Vashi
Department of Chemistry, Navyug Science College, Rander Road, SURAT -395009 Gujarat (INDIA)
S.A. Desai
Department of Chemistry, Arts, Science and Commerce College, Kholwad, Kamraj Ghar Rrasta SURAT - 394185 (INDIA)
Piyush S. Desai
Department of Chemistry, Arts, Science and Commerce College, Kholwad, Kamraj Ghar Rrasta SURAT - 394185 (INDIA)
Keyword:
Corrosion, Zinc, Nitric acid, Toludines.
Issue Date:
June 2008
Abstract:

The corrosion of zinc in nitric acid containing toluidines has been studied at different acid concentration, inhibitor concentration and temperature. In acid, corrosion increases with concentration of acid and with temperature. At constant acid concentration, the inhibition efficiency (I.E.) of toluidines increases with concentration. At constant inhibitor concentration, the I.E. increases with the concentration of acid. At 40 mM inhibitor concentration in 0.15 M HNO3 acid at 301 K for 24 h immersion period, the I.E. decrease in the order :
m-toluidine (90.0%) > p-toluidine (89.7%) > o-toluidine (71.0%). As temperature increases, the rate of corrosion increases, while percentage of inhibition decreases. The mode of inhibition action appears to be chemisorption since the plot of log (q/1-q) versus log C gives straight line which suggest that the inhibitors cover both the anodic and cathodic regions through general adsorption following the Langmuir isotherm. Anodic and cathodic galvanostatic polarization curves show little anodic but significant cathodic polarization.
 

 

Pages:
27-34
ISSN:
2319-8036 (Online) - 0973-3450 (Print)
Source:
DOI:
juc

Copy the following to cite this article:

R. T. Vashi; S. Desai; P. S. Desai, "Toluidines as corrosion inhibitors for Zinc in Nitric Acid", Journal of Ultra Chemistry, Volume 4, Issue 1, Page Number 27-34, 2018

Copy the following to cite this URL:

R. T. Vashi; S. Desai; P. S. Desai, "Toluidines as corrosion inhibitors for Zinc in Nitric Acid", Journal of Ultra Chemistry, Volume 4, Issue 1, Page Number 27-34, 2018

Available from: http://www.journalofchemistry.org/paper/755/

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