The inhibitive effect of Ficus glumosa gum (FG) for the corrosion of mild steel in H2SO4medium was evaluated using the weight loss, gasometric, thermometric and scanning electron microscopy (SEM) techniques. The results obtained revealed that FG gum gum is a good adsorption inhibitor. It inhibited the corrosion of mild steel through themechanism of chemical adsorption (the reasons are inhibition efficiency increases with increasing temperature Ea and ∆Goads values were higher than threshold values of 80 and 40 KJ/mol). The adsorption of the inhibitor on mild steel is exothermic (∆Hoads were negative), spontaneous (values of ∆Goads were negative) and supports the Langmuir adsorption model. Inhibition was probably brought about by the adsorption of the inhibitor on the metal surface of tannins, polysaccharides and glucoproteins constituents of FG on the surface of the mild steel, hence the formation of multiple adsorption layers is proposed.
Key words: Ficus glumosa gum, SEM, mildsteel, corrosion inhibition, adsorption
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