Protection of Mild Steel against Corrosion using Extract of Cajanus cajan Leaves Corrosion Inhibitor in Simulated Seawater Environment
Authors: Adams SM, Obayi CS, Urama NA, Okwudiba IN, Anianwu FO, Ojiugo NU
There is a new direction in research towards the use of plant as corrosion inhibitors for metals and alloys. Thus, the corrosion inhibition of mild steel in 3.5% sodium chloride (NaCl) solution by Cajanus cajan leaves extract was studied using weight loss technique. The corrosion rates of the studied samples were found to decrease with increase in concentration of the inhibitor. The inhibition efficiency also increased with increase in the extract concentration and decreased with increase in temperature. Thermodynamic parameters show that the inhibition is through adsorption of plant extract onto the metal surface and it obeys Langmuir adsorption isotherm and occurs spontaneously. The activation energy as well as other thermodynamic parameters for the inhibition process were calculated and these thermodynamic parameters show strong interaction between inhibitor and mild steel surface.
Affiliations: Department of Metallurgical and Materials Engineering, Faculty of Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria
Keywords: Mild Steel, Corrosion Inhibition, Weight Loss, Activation Energy, Adsorption Isotherms
Published date: 2020/06/30