Centella asiatica extracts as green corrosion inhibitor for mild steel in 0.5 M sulphuric acid medium

Shivakumar, S. S. and Mohana, K. N. (2012) Centella asiatica extracts as green corrosion inhibitor for mild steel in 0.5 M sulphuric acid medium. Advances in Applied Science Research, 3 (5). pp. 3097-3106. ISSN 0976-8610

Text (Full Text) Centella Asiatica Extracts as Green.pdf - Published Version Restricted to Registered users only Download (987kB) | Request a copy

Abstract

The leaf extracts of centella asiatica(CE) was tested as green corrosioninhibitor for mild steel in 0.5 M H2SO4 by using gravimetric, polarization and electrochemical impedance spectroscopy (EIS) measurements. The data obtained from all the three methods are in good agreement with each other. Results indicate that leaf extracts of CE is a good green corrosion inhibitor for mild steel corrosion in 0.5 M H2SO4 solution. The inhibition efficiency was found to increase with increase in CE extracts concentration. A maximum inhibition efficiency of 95.08% was observed for 1200 ppm at 303K. Polarization measurements showed that the CE extracts acts as mixed type of inhibitor.Temperature studies revealed a decrease in inhibition efficiency with increase in temperature which suggests physisrption mechanism. The adsorption characteristics of CEextracts of on mild steel surface obeys Langmuir isotherm. Both kinetic and thermodynamics adsorption parameters were calculated and discussed,and SEM was used to analyse the surface adsorbed film.

Item Type:	Article
Subjects:	C Chemical Science > Chemistry
Divisions:	Department of > Chemistry
Depositing User:	C Swapna Library Assistant
Date Deposited:	29 Aug 2019 09:49
Last Modified:	29 Aug 2019 09:49
URI:	http://eprints.uni-mysore.ac.in/id/eprint/7319

Actions (login required)

View Item