The inhibitive action of acid extracts from Piper guineensis (PG) on mild steel corrosion in HCl and H2SO4 solutions was investigated by gravimetric and gasometric techniques at 30 °C and 60 °C. The results show PG to be a good inhibitor in both acid solutions. PG exhibited better inhibition efficiency (IE) in HCl than in H2SO4 solution and is attributed to the stronger adsorption of Cl- on the metal surface enabling better synergism between Cl- and the protonated inhibitor for improved protection. IE increased with temperature for PG extract in HCl solutions and decreased with temperature for PG extract in H2SO4 solutions. The mechanism of adsorption proposed for PG extract is chemisorption in HCl and physisorption in H2SO4 solutions. The adsorption of PG obeys Langmuir isotherm at low temperature.
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Ikpi et al. (2012) studied this question.
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