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Investigation of adsorptive and inhibitive effect of extracts of Alstonia boonei on aluminium corrosion in 1.0 M sulphuric acid yielded inhibition efficiency of 59.6 and 47.7 % for 0.5 g/L concentration of the extracts at 303 and 333 K respectively for gravimetric measurement. Gasometric measurement gave an inhibition efficiency of 61.0 and 49.9 % at 303 and 333 K respectively. Adsorption behavior was best approximated by the Freundlich adsorption model with evidence of efficient adsorbate-adsorbent binding potential (Kads). Physical adsorption mechanism is proposed from the trend of ΔGads obtained. The adsorption of the extracts onto the metal surface was spontaneous and exothermic. The extracts increased the energy barrier (Ea) of the inhibited solution above that of the blank and hence the inhibition process. A decrease in entropy resulting in formation of ordered adsorbed layer speculated from deductions on transition state plots.

Adsorption and kinetic/thermodynamic characterization of aluminium corrosion inhibition in sulphuric acid by extract of Alstonia boonei