The Synergistic Effect of Iodide on the Inhibitory Activity of Agarose towards Iron Corrosion

Document Type : Original Article

Authors

• Zohreh Moradi ¹
• Zahra Yavari ²
• Salameh Nematiyan ¹

¹ Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran

² ,Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran

10.22067/jmme.2025.90558.1165

Abstract

In industry, the polymers are known as efficient corrosion inhibitors. Among them, the natural polymers are of interest with easy access and low price. In the present work, the corrosion inhibition efficiency of agarose was investigated due to the presence of numerous oxygen atoms in the structure, which are capable of protonation in acid. The polarizability and electron density of agarose were enhanced by adding iodide to its structure. Therefore, the corrosion rate of iron samples was investigated in sulfuric acid and the agarose - potassium iodide mixture with different mass ratios (AG, AG:I, AG:2I and AG:3I) as inhibitors. The efficiency of four introduced inhibitors was compared with different techniques such as: Tafel polarization, gravimetry, electrochemical impedance spectroscopy, atomic force microscopy and scanning electron microscopy. Based on the gravimetric results in the presence of 0.5 g/l inhibitor, the percentage of corrosion inhibition increased from 44.14% for AG to 88.68% for AG:3I. Iodine-containing polymer to improve surface Coverage acted as a mixed inhibitor by physically adsorbing on the surface and affecting the anodic and cathodic half-reactions of corrosion. The presence of iodide in the structure of agarose increases the electron density of the inhibitory polymer and strengthens its inhibitory function.

Keywords

• Agarose
• Tafel Curve
• Mixed Inhibitor
• Gravimetric Analysis
• Surface Coverage

Main Subjects

• Corrosion and Oxidation

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