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FRAP assay proved all the extracts of Areca catechu L. nut have antioxidant properties because IC50 values of all the extracts of the same were less than that of ascorbic acid. Remaining antioxidant assays like DPPH radical scavenging assay, H2O2 scavenging assay, and Fe2+ chelating assay showed more antioxidant properties in ethyl acetate extract and nonpolar solvent extracts like n- hexane, and chloroform respectively. Antioxidant properties of Areca catechu L. nut varied depending upon the different solvent extract.

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The Corrosion inhibition efficiency of an inhibitor namely Nickel complex of 1-(8-hydroxy quinolin-2yl methyl) thiourea (Ni-HTF) in controlling corrosion of mild steel immersed in aqueous solution containing 60 ppm Cl- has been investigated by polarization method. The formulation consisting of 60 ppm of Cl- and 50 ppm of Ni-HTF offers good inhibition efficiency of 80 %. Polarization study reveals that this formulation functions as a cathodic inhibitor. UV-Visible spectral analysis was used to detect the presence of iron-inhibitor complex. The surface morphology has been analyzed by SEM and EDAX.

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