تأثیر نیترات‌سریم بر خواص حفاظتی و چسبندگی پوشش‌های دو لایه PEO/Epoxy اعمال‌شده روی سطح منیزیم

نوع مقاله : مقاله پژوهشی

نویسنده

دانشکده مهندسی مواد، دانشگاه تربیت مدرس، تهران، ایران

چکیده

در این پژوهش تأثیر حضور افزودنی نیترات سریم در ساختار پوشش اکسیداسیون الکترولیتی پلاسمایی (PEO) بر روی رفتار حفاظتی و استحکام چسبندگی پوشش دو لایه PEO/Epoxy اعمال شده بر روی سطح منیزیم AZ31 بررسی گردید. پوشش PEO به عنوان پیش عملیات برای اعمال لایه اپوکسی در نظر گرفته شد. حضور افزودنی سریمی بر روی ریخت سطحی پوشش PEO و همچنین مقاومت به خوردگی آن تأثیرگذار می‌باشد. بررسی‌ها نشان داد که سریم در ساختار پوشش PEO جایگیری نموده و بنابراین ساختار PEO علاوه بر نقش پیش عملیات به عنوان محفظه نگهدارنده سریم عمل می‌نماید. نتایج بررسی آزمون EIS بر روی نمونه‌های دو لایه و همچنین آزمون pull-off در دو حالت خشک و تر نشان داد که حضور سریم باعث بهبود رفتار حفاظتی لایه اپوکسی و استحکام چسبندگی آن می‌شود. تشکیل رسوبات هیدروکسید سریم در مناطق کاتدی منجر به بهبود رفتار حفاظتی سیستم پوششی می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Cerium Nitrate on the Protective and Adhesion Properties of PEO/Epoxy Coating Applied on Mg alloy

نویسنده [English]

  • M. Toorani
Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran
چکیده [English]

In this study the effect of cerium nitrate existing in the structure of plasma electrolytic oxidation (PEO) coating on the protective behavior and adhesion strength of PEO/epoxy duplex coating applied on AZ31 Mg alloy was investigated. PEO coating was considered as the pretreatment for applying the epoxy layer. The presence of Ce additive affected the morphology of the surface of the PEO coating and its corrosion resistance. Embedding Ce in the structure of the PEO layer showed that the PEO structure, in addition to its pretreatment role, acts as the container of cerium. The results of the electrochemical impedance spectroscopy (EIS) test and the pull-off adhesion test in dry and wet conditions on duplex coatings revealed that the presence of Ce improves the protective behavior of the epoxy layer and its adhesion strength. Formation of cerium hydroxide in chathodic regions leads to improvement in the protection properties of duplex coating system.

کلیدواژه‌ها [English]

  • Duplex coating
  • Plasma electrolytic oxidation (PEO)
  • Epoxy
  • Cerium
  • Electrochemical Impedance Spectroscopy (EIS)
  • pull-off
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