Corrosion Inhibition of mild steel in Formic acid using Tamarindus Indica Extract
- 1American University of Nigeria, PMB 2250, Yola, Nigeria
- 2American University of Nigeria, PMB 2250, Yola, Nigeria
- 3American University of Nigeria, PMB 2250, Yola, Nigeria
Res.J.chem.sci., Volume 6, Issue (11), Pages 32-35, November,18 (2016)
Heat of Adsorption of Tamarindus indica leaves extract and mild steel corrosion inhibition in formic acid solutions using Tamarindus Indica as natural inhibitor have been studied using gravimetric technique. Inhibition efficiency was observed to increase with an increase in Tamarindus indica leaf extract concentration. Temperature effect on the corrosion behavior of mild steel in 0.5M, 1M and 2M Formic acid solutions with addition of plant extracts was studied at the temperatures 30°C and 45°C. Optimum Inhibition efficiencies at 45°C are 76.18% for 0.5M, 74.88% for 1M, and 70.82% for 2M. Very low inhibition efficiencies are observed at 30°C. The adsorption mechanism proposed from the heat of adsorptions for 1M and 2M formic acid solutions is physisorption while 0.5M shows chemisorption based on the calculated values of the heat of adsorption.
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