The effect of Commiphora africana (CA) gum exudates on the corrosion of mild steel in 2.5 M Na2CO3 has been studied using weight loss (gravimetric) and thermometric methods at 303 and 333 K. Results obtained suggest that C. africana acts as a good corrosion inhibitor as the inhibition efficiency increased with increase in the concentration of the inhibitor. A decrease in the %I was observed with increase in temperature from 303 to 333 K. Values of inhibition efficiency from weight loss method were found to be significantly higher (p ≤ 0.05) than values obtained from gasometric method, even as the (I%) values from the two methods correlated strongly. Also values of ? Gads, Ea and Qads suggest physical mechanism for the adsorption of the inhibitor molecules on the surface of mild steel even as Temkin adsorption isotherm was found to best suit the adsorption mechanism within the temperature range under study.
Key words: Mild steel, adsorption isotherm, corrosion inhibition, activation energy.
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