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

مهندسی متالورژی و مواد

مقاله 5، دوره 36، شماره 2 - شماره پیاپی 38، خرداد 1404، صفحه 57-72   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jmme.2025.90558.1165

نویسندگان

زهره مرادی؛ زهرا یاوری^* ؛ سلامه نعمتیان

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

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

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