Corrosion Inhibition of Copper Using African Black Velvet Tamarind (Dialium indium) Extract in Sulphuric Acid Environment
Eziaku Osarolube *
Department of Physics, University of Port Harcourt, Port Harcourt, Nigeria.
A. O. James
Department of Pure and Industrial Chemistry, University of Port Harcourt, Port Harcourt, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
Inhibition of corrosion of copper in aerated 0.5M sulphuric acid solutions containing various concentrations of Dialium indium extract was studied at a temperature range of 30 - 50ºC using weight loss and gasometric techniques. Results showed that Velvet Tamarind concentration range of 0.05 - 0.25g/500ml exhibited a good corrosion inhibition of 71.76%. Generally, it was observed that the rate of inhibition increased with temperature of the corrosive media and concentration of the inhibitor. This shows that Velvet Tamarind is a good, efficient and eco-friendly corrosion inhibitor for copper in 0.5M H2SO4 solution at room temperature and better at higher temperature.
Keywords: Temperature, inhibition, weight loss, hydrogen evolution