نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، گروه مهندسی پلیمر، دانشکده فنی و مهندسی، دانشگاه لرستان .
2 پژوهشگر پسادکتری، گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه اصفهان
چکیده
رزین‌های اپوکسی به طور گسترده-ایی به عنوان یک ماده پوششی برای حافظت از فلزات در کاربردهای مختلف، به کار می‌رود. ویژگی‌هایی نظیر فرآیندپذیری بسیار خوب، مقاومت شیمیایی عالی، عایق بودن خوب نسبت به الکتریسته و چسبندگی قوی رزین اپوکسی به مواد غیر هم جنس موجب شده است این مواد به طور گسترده در صنایع تولید پوشش مورد توجه قرار گیرند. پوشش‌های اپوکسی مستعد آسیب‌هایی نظیر میکروترک می‌باشند. این نوع آسیب‌دیدگی‌ها موجب ایجاد نقایصی در پوشش، افت ویژگی‌های ظاهری (زیبایی) و استحکام مکانیکی پوشش می‌شوند. همچنین مسیرهایی برای تسریع ورود آب، اکسیژن و گونه‌های خورنده به سطح فلز ایجاد می‌شود، در نتیجه خوردگی‌های موضعی در فلز رخ می‌دهد. فرآیند ترمیم قطعات ساخته شده از پوشش‌های پلیمری زمان‌بر، گران قیمت و در بسیاری از موارد امکان تشخیص آسیب و دسترسی به آن‌ها برای انجام ترمیم غیرممکن می‌باشد. از این رو یافتن راه‌حلی به منظور ترمیم خودکار میکروترک‌ها بدون نیاز به مداخله بشر و جایگزینی مواد جدید، بسیار حائز اهمیت می‌باشد. بنابراین، به دنبال پژوهش و تلاش‌های زیادی که در این زمینه انجام شده است، این مهم با طراحی سامانه‌های هوشمند خودترمیم شونده عملی می‌گردد. رایج‌ترین روش تهیه پوشش‌های خودترمیم‌شونده، میکروکپسوله کردن عامل ترمیم در پوسته‌های پلیمری یا معدنی و جااسازی میکروکپسول‌های تهیه شده در ماتریس اپوکسی می‌باشد. بررسی خاصیت خودترمیمی در پوشش‌های اپوکسی با آزمون‌های طیف سنجی امپدانس الکتریکی و اسپری نمک انجام می‌گیرد. در این پژوهش، مطالعات انجام شده در زمینه پوشش‌های اپوکسی خودترمیم‌شونده، مرور خواهد شد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
A review on anti-corrosion self-healing epoxy coatings
نویسندگان [English]
- Sadegh Sahraei 1
- Fatemeh Ahangaran 2
1 Department of Polymer Engineering, Faculty of Engineering, Lorestan University, Khorramabad, Iran.
2 Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran.
چکیده [English]
Epoxy resins are widely used as coating to protect metals in various applications. The properties such as very good processability, excellent chemical resistance, good insulation against electricity, and strong adhesion to non-homogeneous materials have caused epoxy materials to be widely considered in the coating industries. Epoxy coatings are susceptible to damage such as microcracking. These types of damages cause defects in the coating and reduce the appearance (beauty) and mechanical strength of the coating. Also, the penetration of water, oxygen and corrosive agents to the surface of the metal is accelerated. As a result, the local corrosion occurs in the metal. The repair process of polymer coatings is time-consuming, expensive, and in many cases it is impossible to detect the damages and access them for repair. Therefore, it is very important to find a solution to automatically repair the microcracks without any type of human intervention and the replacement of new components. Therefore, this can be possible by designing self-healing intelligent systems. The most common method of preparing self-healing coatings is microencapsulation of healing agent in polymer or mineral shells and embedding the prepared microcapsules in the epoxy matrix. The self-healing properties of the epoxy coatings can be investigated with electrical impedance spectroscopy and salt spray tests. In this research, the studies on self-healing epoxy coatings have been reviewed.
کلیدواژه‌ها [English]
- Epoxy resin
- corrosion
- self-healing coatings
- microcapsules
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)