Premkumar, P. and Kannan, K. and Natesan, M. (2008) Thyme extract of thymus vulgar L. as volatile corrosion inhibitor for mild steel in NaCl environment. Asian Journal of Chemistry, 20 (1). pp. 445-451.

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Abstract

Thyme extract of Thymus vulgar L. plant was used as volatile corrosion inhibitor for mild steel in sodium chloride environment with 100 % relative humidity. The corrosion rate and inhibition efficiency of the thyme powder was evaluated by weight loss studies and thyme impregnated craft paper was evaluated by weight loss and potentiodynamic polarization studies. It was found that both powder and impregnated craft paper have significant inhibitive effect. The inhibition efficiency increases with increase in concentration from 250 to 1000 mg for the powder and 250 to 1000 mg/sq.ft for impregnated craft paper. This is due to adsorption of inhibitor molecule on the metal surface. The adsorption behavior of thyme obeys Temkin's adsorption isotherm. At higher concentration there is decrease in inhibition efficiency. It may be due to the formation of soluble metal inhibitor complex in NaCl environment. It has also been found that thyme powder of concentration 1000 mg and impregnated craft paper of concentration 1000 mg/sq.ft offered maximum inhibition efficiency of 80.49 and 78.64 %, respectively.

Item Type:	Article
Uncontrolled Keywords:	Thyme; Thymol; Atmospheric corrosion sensor; Volatile corrosion Inhibitors; Adsorption isotherm
Subjects:	Corrosion Science and Engineering
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	16 Jan 2012 05:27
Last Modified:	16 Jan 2012 05:27
URI:	http://cecri.csircentral.net/id/eprint/32

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