Surface Protection of Steel in Acid Medium by Flacourtia jangomas extract : Phytochemicals and Surface Study Evidence for Adsorption of Inhibitor

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

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Abstract

We present the evaluation of eco-friendly corrosion inhibitor for the corrosion mitigation of mild steel using extract of leaves, roots and stem bark of coffee plum (Flacourtia jangomas) in 1M HCl solution was investigated by weight loss method at 30°C. The corrosion inhibition of mild steel by ethanol extracts coffee plum (Flacourtia jangomas) and some of its isolated phytochemical components; saponins extract, and flavonoids extracts have been studied using gravi-metric techniques. The surface of mild steel was examined by scanning electron microscopy (SEM) and Atomic force microscopy (AFM) techniques. The results of the study reveal that these ecofriendly extracts function as good inhibitors for mild steel corrosion in hydrochloric acid. Inhibition efficiency of the extracts increases with inhibitor concentration and temperature rise. Corrosion rate decreased significantly in presence of extract and inhibition efficiency increased with increasing concentration of extract. Inhibition efficiency performance followed the trend Leaf extract > Root extract > Stem Bark extract at 5% inhibitor concentration. No considerable changes in inhibition efficiency were observed above 5% in all the cases. The decreased corrosion rate and adsorption behavior have been explained by Langmuir, Temkin and Freundlich adsorption isotherm. The constituents responsible for inhibition were identified by Phytochemical analysis and Fourier Transform Infrared Spectroscopy FTIR spectroscopy.

Keywords

Coffee plum (Flacourti jangomas), corrosion inhibitor, mild steel, AFM, SEM, weight loss, Langmuir, Temkin isotherm, FTIR

Conclusion

1) The FT-IR results demonstrate that the target compounds had been synthesized successfully. 2) The inhibition efficiency of FJ extract in a 1 M HCl solution at room temperature was evaluated by weight loss method. The data of the weight loss experiments indicate that the inhibition efficiency increases with increasing inhibitor concentration. 3) Surface analyses including FT-IR, AFM and SEM confirmed the protective effect of these inhibitors. 4) The result showed that corrosion rate was significantly decreased in presence of the extract and percent inhibition efficiency increased with increasing the concentration of extract. 98.1% inhibition efficiency was found in 1M HCl. 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. Leaf extract > Root extract > Stem Bark extract

References

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How to cite this article

Pinky Sisodia, Renu Singh and S. Khalid Hasan (2023). Surface Protection of Steel in Acid Medium by Flacourtia Jangomas extract : Phytochemicals and Surface study Evidence for Adsorption of Inhibitor. Biological Forum – An International Journal, 15(5a): 580-586.