اثر هم افزایی یدید بر فعالیت بازدارندگی آگارز نسبت به خوردگی آهن

نوع مقاله : مقاله پژوهشی

نویسندگان

• زهره مرادی
• زهرا یاوری
• سلامه نعمتیان

گروه شیمی، دانشکده علوم پایه، دانشگاه سیستان و بلوچستان، زاهدان، ایران

10.22067/jmme.2025.90558.1165

چکیده

در صنعت، پلیمرها به عنوان بازدارنده‌های خوردگی کارآمد شناخته می‌شوند. در این میان، پلیمرهای طبیعی با دسترسی آسان و قیمت اندک مورد توجه هستند. در کار حاضر،کارایی بازدارندگی خوردگی توسط آگارز به دلیل داشتن اتم‌های اکسیژن متعدد در ساختار، که قابلیت پروتونه شدن در اسید را دارند، بررسی شد. با افزودن یدید به ساختار آگارز، میزان قطبش‌پذیری و چگالی الکترونی آن تقویت گردید. از این رو، میزان خوردگی نمونه‌های آهن در سولفوریک اسید و مخلوط آگارز - یدید پتاسیم با نسبت‌ جرمی مختلف (AG، AG:I، AG:2I و AG:3I) به عنوان بازدارنده بررسی شد. کارایی چهار بازدارنده معرفی شده، با تکنیک‌های مختلفی از جمله: پلاریزاسیون تافل، گراویمتری، طیف سنجی امپدانس الکتروشیمیایی، میکروسکوپی نیروی اتمی و میکروسکوپی الکترونی روبشی مقایسه گردید. بر اساس نتایج گراویمتری در حضور g/l 5/0 بازدارنده، درصد بازدارندگی خوردگی از 14/44% برای AG به 68/88% برای AG:3I رسید. پلیمر یددار با بهبود پوشانندگی سطح، نقش یک بازدارنده مختلط را با جذب فیزیکی روی سطح و تأثیر بر نیم‌واکنش‌های آندی و کاتدی خوردگی ایفا کرد. وجود یدید در ساختار آگارز چگالی الکترونی پلیمر بازدارنده را افزایش داده و عملکرد بازدارندگی آن را تقویت می‌کند.

کلیدواژه‌ها

• آگارز
• منحنی تافل
• بازدارنده مختلط
• تست گراویمتری
• پوشانندگی سطح

موضوعات

• خوردگی و اکسیداسیون

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عنوان مقاله [English]

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

نویسندگان [English]

• Zohreh Moradi
• Zahra Yavari
• Salameh Nematiyan

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

چکیده [English]

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.

کلیدواژه‌ها [English]

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

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