مروری بر پوشش‌های پلیمری خودترمیم‌ ضدخوردگی دارای میکرو/نانوالیاف با ریزساختار هسته-پوسته

نوع مقاله : مروری

نویسندگان

اصفهان، دانشگاه اصفهان، دانشکده مهندسی، گروه مهندسی شیمی، کد پستی 8174673441

چکیده

پوشش‌های سنتی محافظ در برابر خوردگی فقط به‌عنوان مانع غیرفعال روی بستر فلزی عمل می‌کنند که نمی‌توانند عملکرد حفاظتی فعالی را هنگام آسیب‌دیدگی پوشش روی سطح داشته باشند. پوشش‌های ضدخوردگی هوشمند می‌توانند طول‌عمر پوشش را به‌مراتب افزایش دهند. از سوی دیگر، فناوری‌ خودترمیمی در پوشش‌های پلیمری روشی پیشگیرانه برای جلوگیری از پیشرفت فرایند خوردگی در سطح  فلزات است. این روش به‌منظور جلوگیری از رشد و انتشار ترک در مراحل اولیه و ترمیم خودبه‌خود آسیب‌ها بدون مداخله خارجی، توسعه یافته‌ است. بررسی روند افزایشی انتشار مقاله‌های علمی نشان می‌دهد، به‌تازگی استفاده از پوشش‌های پلیمری هوشمند ضد‌خوردگی همراه با قابلیت خودترمیمی، بسیار مورد ‌توجه ‌قرار ‌گرفته‌اند. در این نوع پوشش‌ها، بازدارنده ضدخوردگی و عوامل ترمیم‌کننده را می‌توان با هم یا به‌طور جداگانه در حامل‌هایی که می‌توانند به‌صورت ریزپوشینه‌های کروی یا نانوالیاف باشند، بارگذاری کرد و درصورت رخداد آسیب روی سطح پوشش، افزون ‌بر فعال‌شدن عملکرد ضدخوردگی، فرایند ترمیم پوشش برای جلوگیری از خوردگی سطح فلز شروع شود. هدف از این مطالعه، مروری بر پوشش‌های جدید پلیمری به‌ویژه بر پایه اپوکسی و با خاصیت خودترمیمی و ضدخوردگی است که می‌توانند به‌‌سرعت به آسیب‌های محیطی ایجادکننده خوردگی یا سایر فرایندهای آسیب‌رسان پاسخ داده و بازدارنده‌های خوردگی یا عوامل ترمیم‌کننده را آزاد کنند. بدین‌منظور، ابتدا سازوکارهای خودترمیمی، روش‌های استفاده از مواد خودترمیم و افزودن خاصیت ضدخوردگی به پوشش، بیان شده و دسته‌بندی شده‌ است. استفاده از ریزپوشینه پلیمری دارای ساختارهای هسته-پوسته به دو صورت ذرات کروی یا نانوالیاف الکتروریسی‌شده در پوشش خودترمیم، دسته‌بندی شده و سپس انواع سامانه‌های نانوالیاف از نظر محل قرارگیری مواد ترمیم‌کننده و ضدخوردگی، نوع پلیمر پوسته و مواد مصرفی در هسته، روش تولید نانوالیاف و شیوه پخش آن در پوشش‌هایی که به‌طور هم‌زمان شامل هر دوخاصیت ضدخوردگی و خودترمیمی هستند، معرفی شده ‌است. در پایان، تازه‌ترین پژوهش‌ها درباره پوشش‌های رسانای دارای نانوالیاف و پوشش‌های دارای نانوالیاف سبز مرور شده ‌است.

کلیدواژه‌ها


عنوان مقاله [English]

Anticorrosion Self-Healing Polymer Coatings Containing Micro/Nanofibers with Core-Shell Microstructures: A Review

نویسندگان [English]

  • Amir Navarchian
  • Elham Alikhani Faradonbeh
Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Postal Code 8174673441, Iran
چکیده [English]

Traditional anti-corrosion coatings only act as a passive barrier on the metal substrate and have no active protective function if the coating on the surface is damaged. Recent smart anti-corrosion coatings can greatly increase the lifespan of the coating. On the other hand, self-healing technology in polymer coatings is a preventive method to progress of corrosion process on the surface of metals. This technique has been developed in order to prevent the growth and propagation of cracks in the early stages and to repair the damage automatically without external intervention. The increasing trend of published scientific articles shows that the use of anti-corrosion smart polymer coatings with self-healing capability has received much attention. In this type of coatings, corrosion inhibitors and healing agents can be loaded together or separately in spherical or nanofiber micro-carriers. In the case of damage of the coating surface, the anti-corrosion as well as healing processes trigger simultaneously to prevent the corrosion progress of the metal surface. The purpose of this study is to review novel epoxy-based coatings with self-healing and anti-corrosion properties. For this purpose, the self-healing mechanisms, methods of implementation of self-healing materials and anticorrosion agents on the coating have been reviewed and categorized. The use of polymer microcapsules with core-shell structures in the form of spherical particles or electrospun nanofibers in self-healing coating has been described. Various nanofiber systems have been classified in terms of the location of restorative and anticorrosion materials, the type of polymer shell and core materials, the electrospinning methods of nanofibers, and the method of dispersing within the coatings, for simultaneous anti-corrosion and self-healing properties. Finally, the recent studies on the coatings containing conductive and/or green nanofibers have been reviewed.

کلیدواژه‌ها [English]

  • anticorrosion
  • self-healing
  • coating. encapsulation
  • micro/nanocarrier
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