Plant-based corrosion inhibitor from extracts of Cerbera Odollam: study of inhibition efficiency on mild steel in various electrolyte conditions: article

Extracts of oil from sea mango (Cerbera Odollam) seeds was investigated in terms of its corrosion inhibition potentials via weight loss measurements and potentiodynamic Tafel polarization technique. It was found that sea mango oil reduced corrosion rate and increased inhibition efficiency as inhibitor concentration and pH test solution increased from 2 to 7. Structural characterization of active corrosion compounds in oil samples was analysed using FT-IR and GCMS. Phytochemical screening tests were performed to detect the presence of saponin, phenol, steroid and tannin. The inhibitive properties of these extracts were likely due to the presence of oxygen and nitrogen atoms, which have evidenced from FTIR and GCMS. The adsorption of sea mango oil was found to best fit Langmuir adsorption isotherm.