Corrosion Inhibition properties of a Substituted Water Hyacinth on Mild Steel in 1M HCl

Author: Pinky Sisodia, Renu Singh and S. Khalid Hasan

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Abstract

Finishing of metallic surface is pre requisite for any mechanical component which is generally carried out by pickling using mineral acids. But metals get dissolved readily in such acids if treated without inhibitor. So many synthetic chemicals are used as corrosion inhibitors which are toxic in nature, therefore need of a green corrosion inhibition has been required; water hyacinth has been found an excellent naturally occurring corrosion inhibitior. The inhibition efficiency of aqueous extract solutions of water hyacinth was examined by weight loss method at 37°C. The importance of inhibition efficiency was established conditional on the concentration of the inhibitor. A reduction in corrosion speed and growth in inhibition efficiency was practical with a gain in the concentration of the inhibitor. Inhibition efficiency expanded regularly with increasing concentration until reached the maximum. The maximum inhibition was found 97.7% at about 7% concentration of inhibitor. The increased inhibition was explained based on adsorption isotherms. The decreased corrosion rate and adsorption behaviour have been explained by Langmuir, Temkin and Freundlich adsorption isotherm. The constituents responsible for inhibition which were adsorbed on the surface of the metal were identified by Phytochemical analysis and Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy.

Keywords

Corrosion inhibitor, adsorption, weight loss, Langmuir, Temkin isotherm, FTIR

Conclusion

1. The aqueous extract of Water hyacinth (Jalkumbhi) has been found an excellent natural corrosion inhibitor for mild steel in 1M HCl solution. 2. The corrosion rate significantly decreased and inhibition efficiency increased with increasing concentration of inhibitor. 3. The adsorption was of chemisorptions nature that provided a good protection. 4. It was adsorbed molecules were poly phenols which was identified by chemical analysis and FT-IR analysis. 5. The decreased corrosion rate was due to adsorption of plant extract which was discussed on the basis of Langmuir, Freundlich and Temkin adsorption isotherm.

References

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How to cite this article

Pinky Sisodia, Renu Singh and S. Khalid Hasan (2023). Corrosion Inhibition properties of a Substituted Water Hyacinth on Mild Steel in 1M HCl. Biological Forum – An International Journal, 15(5): 1187-1193.