A Green and Sustainable Approach for Corrosion Inhibition of Carbon Steel in HCl Solution by Abelmoschus Esculentus Peduncle Extract

Lubna Ghalib; Baydaa Jaber  Nabhan; Amina Kassim  Hussain; Shaukat Ali  Mazari

doi:10.31272/mjmes.v2i1.20

Authors

Lubna Ghalib Materials Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq Author https://orcid.org/0000-0001-8893-3742
Baydaa Jaber Nabhan Materials Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq Author https://orcid.org/0000-0002-2906-1101
Amina Kassim Hussain Materials Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq Author https://orcid.org/0000-0002-0940-1658
Shaukat Ali Mazari Department of Chemical Engineering, Dawood University of Engineering and Technology, Karachi-74800, Pakistan Author https://orcid.org/0000-0002-6964-1207

DOI:

https://doi.org/10.31272/mjmes.v2i1.20

Keywords:

Corrosion Inhibition, Carbon Steel, Abelmoschus esculentus, Green Inhibitor, HCl, Adsorption Isotherm, Weight Loss

Abstract

The corrosion of carbon steel in hydrochloric acid (HCl) is a major economic and safety problem in industrial processes such as pickling and descaling. This research investigates the use of peduncle extract from Abelmoschus esculentus (okra) as a green, ecological corrosion inhibitor. A structured literature review indicates that okra extracts, particularly mucilage, can achieve high inhibition efficiencies (up to 96%) by adsorbing onto carbon steel surfaces, predominantly following the Langmuir adsorption isotherm. Experimentally, weight loss measurements were performed on carbon steel in 1 M HCl with varying concentrations of okra peduncle extract (1–3) g at 20–60 °C. Results showed high inhibition efficiency (up to 98.4% at 40 °C for 3 g extract), which was concentration-dependent and exhibited a slight decrease at 60°C (90.7%). Thermodynamic analysis indicated a spontaneous physisorption process. The synthesized evidence confirms that Abelmoschus esculentus peduncle extract is a potent, sustainable, and economically viable alternative to traditional synthetic corrosion inhibitors.

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