Objective: The ethanolic extract of was used as corrosion inhibitor on carbon steel in acidic medium. Drypetes sepiaria The phytochemical screening, antimicrobial activity and GC-MS analysis of the plant extract were carried out. Material and Methods: The anticorrosion property of was determined by weight loss method, for Drypetes sepiaria various concentrations of the extract with Zn ion and tartaric acid, citric acid and lactic acid as additives in 0.5M HCl 2+ medium. The protective film that

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... formed on the surface of the metal which resists the Results and Conclusion: corrosion was confirmed by the spectral studies such as FT-IR, UV and fluorescence spectra. The film formation is also confirmed by the surface morphology SEM analysis. This shows the complex formation between the metal cation, additive and the phytoconstituents present in the extract of Drypetes sepiaria.