Lignin from termite frass: a sustainable source for anticorrosive applications

kulkarni, Prateek and Ponnappa, Charitha B and Doshi, Partha and Padmalatha, * and Balaji, Seetharaman (2021) Lignin from termite frass: a sustainable source for anticorrosive applications. Journal of Applied Electrochemistry, 51. pp. 1491-1500. ISSN 0021-891X

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Abstract

The present study reports a sustainable source of lignin, from termite frass. Lignin was extracted using Klason’s method and subjected to polarization studies to check the inhibition efciency and measured the electrochemical performance of the coated sample on the carbon steel using electrochemical impedance spectroscopy. The anticorrosive property was determined in a simulated corrosive environment (0.1 M NaOH and 0.5 M NaOH). The morphological analysis of the surface of both bare metal and the lignin-coated ones, before and after exposure to the corrosive environment, was recorded using atomic force microscopy (AFM), scanning electron microscopy (SEM), and energy-dispersive X-Ray spectroscopy (EDX). The lignin showed maximum inhibition efciency at 600 ppm in 0.5 M NaOH solution. Moreover, the lignin coated on carbon steel exhibited about 70% corrosion inhibition efciency as recorded by potentiodynamic polarization studies and electro�chemical impedance spectroscopy. The AFM and SEM analyses further corroborated the protection of the metal surface from corrosion when coated with lignin. Hence, the study suggests lignin from termite frass as a sustainable biological source suitable for anticorrosive applications.

Item Type: Article
Uncontrolled Keywords: Lignin · Termite frass · Anticorrosive · Corrosion · Electrochemical analysis
Subjects: Engineering > MIT Manipal > Biotechnology
Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 24 Aug 2022 06:19
Last Modified: 24 Aug 2022 06:19
URI: http://eprints.manipal.edu/id/eprint/159249

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