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β-Sitosterol isolated from rice hulls as an efficient corrosion inhibitor for mild steel in acidic environments

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Abstract

β-Sitosterol has an inhibiting effect on the corrosion of mild steel. We investigated this effect in a H2SO4 solution using β-sitosterol-3-O-β-D-glucoside (β-sitosterol) isolated from rice hulls. Proton nuclear magnetic resonance, UV-visible spectroscopy, FT-IR spectroscopy, weight loss measurements, electrochemical studies, and atomic absorption spectroscopy were used to examine the inhibition of β-sitosterol on mild steel corrosion in a 1 M H2SO4 solution. The effect of temperature on the corrosion behavior of mild steel was examined in the range of 303–333 ± 1 K. The inhibition efficiency increased with increasing inhibitor concentration and decreased with increasing temperature. Electrochemical studies indicated that isolated β-sitosterol acted as a good corrosion inhibitor. The surface morphologies of the mild steel specimens were analyzed by scanning electron microscopy. The maximum inhibition efficiency of β-sitosterol (500 ppm) was 95%. The surface morphology was identified using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDS), and atomic force microscopy (AFM).

Graphical abstract: β-Sitosterol isolated from rice hulls as an efficient corrosion inhibitor for mild steel in acidic environments

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Publication details

The article was received on 10 Dec 2016, accepted on 05 Apr 2017 and first published on 05 Apr 2017


Article type: Paper
DOI: 10.1039/C6NJ03760G
Citation: New J. Chem., 2017, Advance Article
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    β-Sitosterol isolated from rice hulls as an efficient corrosion inhibitor for mild steel in acidic environments

    M. Prabakaran, S. Kim, A. Sasireka, V. Hemapriya and I. Chung, New J. Chem., 2017, Advance Article , DOI: 10.1039/C6NJ03760G

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