مروری بر بهبود خواص مقاومت به خوردگی و سایش آلیاژهای منیزیم با استفاده از نانوذرات رنگدانه اکسید روی به روش اکسیدشدن الکترولیتی پلاسما

نوع مقاله : مقاله مروری

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه شناسایی و انتخاب مواد مهندسی، دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌ها‌ی فنی، دانشگاه تهران

2 دانشجوی کارشناسی ارشد، گروه پژوهشی نانوفناوری رنگ، پژوهشگاه رنگ

3 دانشیار، گروه پژوهشی نانوفناوری رنگ، پژوهشگاه رنگ

4 استاد، گروه شناسایی و انتخاب مواد مهندسی، دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌ها‌ی فنی، دانشگاه تهران

چکیده

منیزیم و آلیاژهای آن به دلیل داشتن خواص ویژه از قبیل چگالی بسیار کم، استحکام ویژه بالا، ظرفیت میرایی فوق‌العاده، قابلیت ماشین‌کاری و کارپذیری عالی پتانسیل بالایی در کاربردهای صنعتی نظیر صنایع هوافضا، خودروسازی و تجهیزات مخابراتی دارند. با این حال، منیزیم به‌دلیل فعالیت شیمیایی ذاتی بالا یکی از واکنش‌پذیرترین عناصر فلزی است و اکسیدی که تشکیل می‌دهد برخلاف اکسیدهای آلومینیم و تیتانیم، محافظت کمی از زیرلایه دارد که باعث ایجاد محدودیت در استفاده گسترده آن شده است. یکی از روش‌های بهبود خواص سطحی این فلز و آلیاژهای آن پوشش‌دهی است. پوشش‌دهی اکسیدشدن الکترولیتی پلاسما (PEO) به عنوان یک فرآیند پوشش‌دهی جدید گزینه مناسب برای اعمال یک لایه سرامیکی مقاوم به خوردگی و سایش بر روی فلزاتی مانند منیزیم که تمایل زیادی برای ایجاد فیلم پسیو دارند، می‌باشد. این پوشش دارای عیوبی نظیر ترک‌ها و تخلخل‌هایی است که باعث نفوذ راحت عوامل خورنده به زیر لایه فلزی می‌شود. استفاده از نانوذرات در الکترولیت، با ایجاد پوشش‌های کامپوزیتی، موجب کاهش تخلخل‌های موجود می‌شود. در این حالت پوشش فشرده‌تر و نفوذ یون‌های خورنده بین لایه‌های پوشش سخت‌تر انجام می‌شود و نهایتا منجر به بهبود مقاومت به خوردگی و مقاومت به سایش این آلیاژ می‌شود. در این مطالعه تاثیر نانوذرات رنگدانه اکسید روی بر بهبود پوشش‌ها‌ی PEO و سازوکارهای اختلاط آنها در الکترولیت بررسی می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

A Review of Improving Corrosion Wear Resistance Properties of Magnesium Alloys Using Nanoparticles of Zinc Oxide Pigment by Plasma Electrolytic Oxidation Method

نویسندگان [English]

  • Nima Rahbari Fard 1 2
  • Mehrnaz Gharagozlou 3
  • Saeed Reza Allahkaram 4
1 Material Characterization and Selection Group, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran,|Department of Nanomaterials and Nanocoatings, Institute for Color Science and Technology
2 Material Characterization and Selection Group, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran,|Department of Nanomaterials and Nanocoatings, Institute for Color Science and Technology
3 Department of Nanomaterials and Nanocoatings, Institute for Color Science and Technology
4 Material Characterization and Selection Group,school of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran,
چکیده [English]

Magnesium and its alloys have unique properties, including low density, high specific strength, excellent damping capacity, and excellent workability. These qualities have made them extremely attractive for aerospace and automotive telecommunications equipment applications. Magnesium is highly reactive due to its high intrinsic chemical activity. However, the oxide it forms has little substrate protection, unlike aluminum titanium oxides, thus limiting its widespread use. One way to improve the surface properties of this metal and its alloys is coating. Plasma electrolytic oxidation (PEO) as a new coating process is a good option for applying a corrosion abrasion-resistant ceramic layer to metals like magnesium that strongly form a passive film. This coating has crack, porosity, and defects that allow corrosive agents to penetrate the metal layer easily. The use of nanoparticles in the electrolyte reduces existing porosity by creating composite coatings. In this case, more compact coating and diffusion of corrosive ions between the coating layers are harder, thus improving alloys' corrosion resistance and abrasion resistance. This study investigates the effect of zinc oxide pigment nanoparticles on improving PEO coatings and their mixing mechanisms in the electrolyte.
 

کلیدواژه‌ها [English]

  • corrosion
  • Nanoparticles
  • Zinc oxide pigment
  • Plasma electrolytic oxidation
  • Magnesium alloys
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