Methanol Extract of Melastoma malabathricum Leaves as Eco-Friendly Corrosion Inhibitor for Mild Steel in Sulfuric Acid

Diah Riski  Gusti; Intan Lestari; Faizar Farid; Abdi Wahyudi; Azril; Mohd Zaki  Sukor

doi:10.24036/eksakta/vol23-iss03/386

EKSAKTA: Berkala Ilmiah Bidang MIPA

Open Access

Methanol Extract of Melastoma malabathricum Leaves as Eco-Friendly Corrosion Inhibitor for Mild Steel in Sulfuric Acid

Diah Riski Gusti ¹

, Intan Lestari ¹

, Faizar Farid ¹

, Abdi Wahyudi ¹

, Azril ²

, Mohd Zaki Sukor ³

¹ Department of Chemistry, Faculty of Sciences and Technology, Universitas Jambi, Jambi, Indonesia

² Department of Biomedical Engineering, National Cheng Kung University, Tainan City, Taiwan

³ Chemical Engineering Studies, College of Engineering, Universiti Teknologi MARA, Pasir Gudang, Johor Bahru, Malaysia

Published 2023-09-30

Vol. 24 No. 03 (2023) PAGES 352-361

DOI 10.24036/eksakta/vol23-iss03/386

Views / Downloads 1725 230

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Abstract

Methanol extract of Melastoma malabathricum (MEMML) contains secondary metabolites such as phenolics and flavonoids. These compounds have OH groups that can interact with Fe contained in steel and form a thin layer for corrosion inhibition on mild steel. Inhibition of mild steel corrosion using MEMML leaves in sulfuric acid solution was carried out using weight loss and potentiodynamic polarization methods. The results showed that the mild steel corrosion rate decreased and inhibition efficiency increased with the addition of MEMML. FTIR and SEM analysis showed the interaction between mild steel with MEMML forming a layer on the surface of the steel so that it inhibits corrosion. The inhibition efficiency has increased with the length of immersion time and concentration of MML methanol extract. The highest inhibition efficiency, 98.86%, was obtained at 72 hours of immersion time and 10 g / L MEMML.

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