Ocimum gratissimum extracts as green inhibitors for the management of microbiologically induced corrosion on buried metals
1 Department of Microbiology, Faculty of Science, University of Port Harcourt, Choba, Port Harcourt, Rives State, Nigeria.
2 South-South Zonal Centre of Excellence, National Biotechnology Research and Development Agency -Regional Centre for Biotechnology and Bioresources Research, University of Port Harcourt.
Research Article
GSC Advanced Research and Reviews, 2024, 21(02), 469–477.
Article DOI: 10.30574/gscarr.2024.21.2.0436
Publication history:
Received on 06 October 2024; revised on 17 November 2024; accepted on 20 November 2024
Abstract:
The application of green corrosion inhibitors is increasingly recognized as an eco-friendly approach to mitigating corrosion. This study investigates the inhibitory effects of ethanolic and aqueous extracts of Ocimum gratissimum (OG) on buried metals, focusing on managing microbiologically induced corrosion (MIC). Over a 28-day period, carbon steel coupons were conditioned with OG extracts and buried in spiked clayey loam soil containing produced water to simulate anaerobic MIC conditions. Experimental setups included OGEE (Ethanolic extract of OG), OGAE (Aqueous extract of OG), and a control without extracts. After 14 and 28 days, corrosion effects were assessed gravimetrically, calculating metal weight loss, corrosion rate, and inhibition efficiency. Results showed mean percentage weight losses of 0.87%, 0.82%, and 1.73% for OGEE, OGAE, and Control setups, respectively. The corrosion rates were 11.76 mpy for OGEE, 11.15 mpy for OGAE, and 23.43 mpy for the control. Inhibition efficiencies were 49.7% and 52.3% for OGEE and OGAE, respectively. One-way ANOVA and Tukey HSD post hoc tests confirmed significant reductions in mean percentage weight loss for both OG-treated setups compared to the control at 14 and 28 days, with no significant difference between OGEE and OGAE. The findings indicate that O. gratissimum extracts significantly reduce MIC in buried metals, providing an effective, sustainable approach to corrosion management in buried pipelines.
Keywords:
Ocimum gratissimum; Ethanol extract; Aqueous extract; Green inhibitors; Microbiologically induced corrosion
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Copyright © 2024 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0
