Affiliation:
1. Department of Chemistry, Government College of Technology, Tamil Nadu, Coimbatore 641013, India
2. Department of Chemistry, L.R.G. Government Arts College for Women, Tamil Nadu, Tirupur 638604, India
Abstract
The Inhibitive action of the extracts ofAdathoda vasica, Eclipta alba,andCentella asiaticaon the corrosion of mild steel in 1N HCl has been studied using weight loss method, electrochemical methods, and hydrogen permeation method. Polarization method indicates that the plant extracts are under mixed control, that is, promoting retardation of both anodic and cathodic reactions. The impedance method reveals that charge-transfer process controls the corrosion of mild steel. The plant extracts obey Langmuir adsorption isotherm. Theoretical fitting of the corrosion data to the kinetic-thermodynamic model was tested to show the nature of adsorption. Physisorption mechanism has been proposed for the inhibition action of these plant extracts. The protective film formed on the surface was confirmed by SEM. From hydrogen permeation method, all the plant extracts were able to reduce the permeation current. Results obtained in all three methods were very much in good agreement in the orderEclipta alba > Adathoda vasica > Centella asiatica,and, among the three plant extracts studied, the maximum inhibition efficiency was found inEclipta albawhich showed 99.6% inhibition efficiency at 8.0% v/v concentration of the extract.
Subject
Process Chemistry and Technology,General Materials Science
Cited by
25 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献