Abstract
The acid extract of Bauhinia racemosa Lam (BRL) leaves was investigated experimentally for its anticorrosion properties on mild steel in hydrochloric acid (HCl) medium using weight loss method by varying inhibitor concentration, time of immersion and acid concentration. The effect of temperature on the corrosion behavior of mild steel was studied in the range of 308K-343K. The inhibition efficiency was found to increase with increasing concentration of the extract and the optimum concentration of the plant extract is found to be 0.5% (%v/v) for mild steel in different acid concentrations and a maximum inhibition efficiency of 90% is attained for 1M HCl at room temperature, whereas in 2M and 5M HCl the inhibition efficiency is found to be low. The adsorption process obeys Langmuir model with a standard free energy of adsorption ?Gads-26.41KJ/mol. Scanning Electron Microscopy (SEM) images showed the adsorption of inhibitor on the metal surface offering protection against acid attack.
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