Effect of Triumfetta rhomboidea Leaves Extract on the Corrosion Resistance of Carbon Steel in Acidic Environment
Nkem B. Iroha *
Department of Chemistry, Federal University, Otuoke, Bayelsa State, Nigeria.
Nancy Ada Madueke
Department of Chemistry, Federal University, Otuoke, Bayelsa State, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
The inhibition capability of Triumfetta rhomboidea (TR) leaves extract on the corrosion of carbon steel in I M HCl was evaluated using weight loss technique. Scanning electron microscopy (SEM) analysis was also performed. Results showed that the extract acts as a good inhibitor for carbon steel and its efficiency increases with an increase in its concentration and exposure time. The SEM observations confirmed the existence of a protective film of inhibitor on carbon steel surface. The inhibiting action of Triumfetta rhomboidea extract was attributed to the phytochemical species present in the extract and its adsorption on the carbon steel surface. The adsorption of Triumfetta rhomboidea extract on carbon steel surface obeys Langmuir adsorption isotherm with physical adsorption on the metal surface.
Keywords: Triumfetta rhomboidea, carbon steel, weight loss, scanning electron microscopy, adsorption