بررسی تأثیر فرایند اکسیداسیون الکترولیتی پلاسمایی به‌عنوان آماده‌سازی سطح روی مقاومت به خوردگی پوشش‌های پلیمری اعمالی روی سطح منیزیم

نویسنده

دانشگاه تربیت مدرس، دانشکده فنی و مهندسی، بخش مهندسی مواد، تهران، ایران

چکیده

در این پژوهش، اکسیداسیون الکترولیتی پلاسمایی (PEO) در سه فرکانس 500، 1000 و 3000 هرتز روی سطح منیزیم، اعمال و سپس تأثیر آماده‌سازی سطح بر رفتار حفاظتی سه نوع پوشش پلیمری اپوکسی، اپوکسی پیوند ذوبی (FBE) و پلی‌یورتان بررسی شد. خواص ریزساختاری و حفاظتی پوشش‌های PEO توسط میکروسکوپ الکترونی روبشی و آزمون‌های پلاریزاسیون پتانسیودینامیک و طیف‌سنجی امپدانس الکتروشیمیایی (EIS) مطالعه شد. نتایج نشان داد که در فرکانس 3000 هرتز پوشش از حفرات ریزتر و رفتار حفاظتی بهتری برخوردار است. برای بررسی رفتار حفاظتی پوشش‌های ‌دولایه از آزمون EIS در محلول 3/5 درصد NaCl استفاده شد. نتایج به‌دست آمده بیانگر تأثیر مطلوب آماده‌سازی سطح توسط فرایند PEO روی رفتار حفاظتی لایه‌های پلیمری بود. همچنین بهترین رفتار حفاظتی مربوط به سیستم PEO/FBE بوده است.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Plasma Electrolytic Oxidation Process as a Pretreatment on Corrosion Resistance of Polymeric Coatings Applied on Mg Alloy

نویسنده [English]

  • M. Toorani Farani
Department of Materials Engineering, Tarbiat Modares University, 14115-143, Tehran, Iran.
چکیده [English]

In this study, Plasma Electrolytic Oxidation (PEO) at three frequencies of 500, 1000 and 3000 Hz was applied on Mg surface and the effect of PEO surface preparation on protective behavior of three types of epoxy, fusion bond epoxy (FBE) and polyurethane coatings was investigated. The microstructural and protective properties of PEO coatings were studied by SEM, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the coating formed at frequency of 3000 Hz had smaller pore size and better protection properties. EIS test in 3.5 Wt.% NaCl solution was also used to investigate the protective behavior of the two-layered coatings. The results showed that PEO process had a favorable effect on the protective behavior of the polymer layers. Moreover, the best protection behavior was related to the PEO/FBE coating system.

کلیدواژه‌ها [English]

  • Plasma electrolytic oxidation coating
  • Polymer coating
  • Magnesium
  • Electrochemical methods

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مواد پیشرفته در مهندسی
دوره 39، شماره 1
خرداد 1399
صفحه 29-45

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