Nor Khuza Hidayu Ismail1, Shafreeza Sobri This email address is being protected from spambots. You need JavaScript enabled to view it.1, 2, and Nur Izzah Nabilah Haris2

1Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
2Institute of Nanoscience and Nanotechnology, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia


Received: December 5, 2021
Accepted: April 24, 2022
Publication Date: May 20, 2022

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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Cassava peel powder (CPP) was utilized as a green corrosion inhibitor to reduce the mild steel (MS) corrosion rate (Rc) in acidic media. The weight-loss method was employed to investigate the Rc and inhibition efficiency (IE) of the mild steel specimen in uninhibited and inhibited 1.0 M HCl solution with CPP dosages of 0.2, 0.4, 0.6, 0.8 and 1.0 g for a set amount of immersion times ranging from 24 to 120 hours. Results show that the inhibitive performance of CPP increased as the inhibitor dosages increased from 0.2 to 1.0 g but decreased with a rise in immersion time, inferring that longer immersion time is unfavorable. CPP dosage of 1.0 g attained the highest inhibition efficiency of 86.77% after 24 hours immersion time. Optimization study via Response Surface Methodology (RSM) demonstrates that the optimum conditions are estimated at 1.0 g CPP dosage and 57 hours immersion period, with an efficiency of 87.20%. The thermodynamic analysis revealed that the inhibition process is spontaneous and obeyed Langmuir isotherm, and the mechanism of inhibition inclined towards chemisorption.

Keywords: acid corrosion, mild steel, cassava peel powder, green corrosion inhibitor


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