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Optimization and characterization of a green corrosion inhibitor using Costus speciosus extract for the corrosion of mild steel in 1 M HCl

Author Affiliations

  • 1Department of Chemistry, University of Colombo, P.O. Box 1490, Colombo 03, Sri Lanka
  • 2Department of Chemistry, University of Colombo, P.O. Box 1490, Colombo 03, Sri Lanka

Res.J.chem.sci., Volume 8, Issue (1), Pages 18-22, January,18 (2018)

Abstract

Corrosion inhibition by natural compounds has gained attention over traditional methods due to the adverse effects associated with traditional synthetic inhibitors which are harmful for humans as well as the environment. In this study, Costus speciosus, a native plant found widespread in Sri Lanka, known commonly as Thebu, was investigated as a potential corrosion inhibitor. A 10% extract of Thebu leaves in 1 M HCl was shown to have maximum inhibition efficiency when tested for corrosion of mild steel. This was verified by weight loss and electrochemical measurements. As shown by adsorption isotherm studies the mechanism of adsorption of inhibitor molecules to metal surface was identified as chemisorption by forming a monolayer.

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