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Corrosion Inhibition of Mild Steel by Alkaloid Extract of Ocimum Sanctum in HCl and HNO3 Solution

Author Affiliations

  • 1Synthetic and Surface Science Laboratory, Department of Chemistry, Govt. College, Ajmer, Raj., INDIA

Res.J.chem.sci., Volume 2, Issue (5), Pages 51-56, May,18 (2012)


Corrosion of mild steel in hydrochloric and nitric acid solution was studied by weight loss and thermometric methods in presence of ocimum sanctum extract. From weight loss data it was observed that the inhibition efficiency increases with the increases in the concentration of the extract of stem in HCl and HNO3 solution as compare to extract of leaves of ocimum sanctum. Maximum inhibition efficiency was found (98.67%) in 0.5N HCl acid with 1.2% stem extract, whereas it was (71.62%) in 2N HNO3 acid with same concentration i.e. 1.2%. The corrosion rate was found to decrease with the increases in concentration of extract up to 0.3% to 1.2%. In the case of thermometric method it was observed that the reaction number decreases with the increases in the concentration of extract while inhibition efficiency increases with increasing concentration of extract of ocimum sanctum in HCl and HNO3 solution.


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