The corrosion inhibition of mild steel in H2SO4 solution in the presence of Juniperus plant at a temperature range of 30 to 60°C was studied using chemical (HE and WL) and electrochemical (PDP and EIS) methods. The Juniperus plant acts as an inhibitor in the acid environment. The inhibition efficiency increases with increase in inhibitor concentration but decreases with an increase in temperature. The inhibitive effect of the Juniperus plant could be attributed to the presence of some compound in the plant which is adsorbed on the surface of the mild steel. The Juniperus plant was found to conform to the Frumkin adsorption isotherm and Temkin adsorption isotherm at all the concentration levels and temperature studied. The phenomenon of physical adsorption is proposed from the activation parameters obtained. Thermodynamic parameters revealed that the adsorption process is spontaneous.
Key words: Corrosion-inhibition, frumkin adsorption isotherm and temkin adsorption isotherm, physical adsorption, Juniperus plant.
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