The corrosion inhibition properties of Delonix regia leaf extract (DLE), flower extract (DFE) and seed extract (DSE) in 0. 5 M HCl solutions were studied using weight loss technique. D. regia extracts inhibited the corrosion of mild steel in HCl solution. The inhibition efficiency increased with increasing concentration of the extracts at 30°C. The seed extract (DSE) was found to be more effective than both the leaf (DLE) and flower extracts (DFE) at the lowest concentration. The results obtained revealed that the adsorption of the inhibitor molecule onto mild steel surface accords with Lanqmuir adsorption isotherm.
Key words: Acid corrosion, adsorption, corrosion inhibitor, mild steel, Delonix regia.
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