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Sunova spirulina Powder as an Effective Environmentally Friendly Corrosion Inhibitor for Mild Steel in Acid Medium

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Abstract

Spirulina, blue green algae is a rich source of proteins and vitamins with excellent antioxidant properties. Sunova spirulina powder an effective, green corrosion inhibitor was used to evaluate its inhibition efficiency towards mild steel in 1 M HCl medium. Weight loss studies of mild steel showed an inhibition efficiency of 96% for 600 ppm concentration of inhibitor solution and 12 h of immersion period at 303 K. The percentage of inhibition efficiency increased with a step up of 10 K raise in temperature from 303 to 333 K and thereafter decreased. The results obtained were further validated by inductively coupled plasma optical emission spectrometric (ICP-OES) measurements and electrochemical techniques that included Tafel polarisation, linear polarisation and AC impedance studies. Potentiodynamic polarisation study marked the inhibitor to be a mixed type inhibiting both cathodic and anodic reactions. The adsorption studies proved that the adsorption process was spontaneous and followed Langmuir adsorption isotherm. The thermodynamic activation and adsorption parameters calculated showed that the mechanism of inhibition involved a physisorption process initially and then it slightly shifted towards chemisorption process at higher temperature. The protective layer formed on the metal surface was studied using FTIR and SEM. The complex formation between the Fe2+ and the active constituents of the spirulina extract was verified using UV visible spectra and fluorescence spectra. The effect of inhibitor concentration and temperature on corrosion rate was tested statistically using two-way analysis of variance (ANOVA) technique.

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Acknowledgements

One of the authors S.J. Hepziba wishes to thank Centre for Research, CHRIST (Deemed to be University) for providing the financial support and Ms. Jilna Jomy I MSc chemistry for her involvement in carrying out a part of the research work.

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  1. Department of Chemistry, CHRIST (Deemed To Be University), Bengaluru, India

    S. J. Hepziba Magie Jessima & James Arulraj

  2. Department of Chemistry, Avinashilingam Institute for Home Science and Higher Education for Women (Deemed To Be University), Coimbatore, India

    S. Subhashini

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Jessima, S.J.H.M., Subhashini, S. & Arulraj, J. Sunova spirulina Powder as an Effective Environmentally Friendly Corrosion Inhibitor for Mild Steel in Acid Medium. J Bio Tribo Corros 6, 71 (2020). https://doi.org/10.1007/s40735-020-00370-x

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