نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی مواد، دانشکده فنی و مهندسی، واحد کرج، دانشگاه آزاد اسلامی، کرج، البرز، ایران

2 استادیار، گروه مهندسی مواد، دانشکده فنی و مهندسی، واحد کرج، دانشگاه آزاد اسلامی، کرج، البرز، ایران

چکیده

نظر به اهمیت آلیاژهای منیزیم به جهت وزن کم آنها، حذف محدودیت­های سطحی مانند سایش و خوردگی به توسعه و افزایش کاربرد آنها کمک می کند.در تحقیق حاضر، پوشش نانوکامپوزیتی Ni-P-GO به روش الکترولس بر سطح  AZ31D اعمال گردید. پس از آبکاری، عملیات کریستالیزاسیون در دو دمای °C ۲۵۰ و °C ۵۰۰ به مدت یک ساعت انجام شد. نتایج بررسی­ به وسیله پراش پرتو ایکس (XRD) و میکروسکوپ الکترونی روبشی (SEM) نشان داد که پوشش با مورفولوژی گل­کلمی به صورت نیمه آمورف بر سطح نمونه تشکیل شده است و پس از کریستالیزاسیون با حفظ مورفولوژی در کنار رشد کلونی­های پوشش، فازهای میانی فسفید-نیکل تشکیل شدند. با افزایش میزان فسفر زمینه، تمایل برای جذب نانو­صفحات GO افزایش یافت. در دماهای پایین، در ابتدا فاز Ni2P تشکیل گردید که با افزایش میزان فسفر زمینه و دمای کریستالیزاسیون این فاز به Ni3P تبدیل گردید. این عمل افزایش سختی را به جهت ترسیب فازهای میانی و کریستالیزاسیون درپی داشت. با افزایش فسفر زمینه در دمای   °C ۵۰۰ انرژی لازم برای تشکیل فازهای ناپایدار Ni5p 2 و Ni8p 3 تأمین گردید. نتایج آزمون پلاریزاسیون نشان داد که اعمال پوشش در مقایسه با زیرلایه منجر به افزایش مقاومت به خوردگی می­ گردد. افزایش فسفر در زمینه به جهت افزایش چگالی لایه هیپوفسفیتی، منجر به افزایش مقاومت به خوردگی می­گردد. با انجام عملیات حرارتی، مقاومت به خوردگی در مقایسه با حالت بدون عملیات حرارتی کمتر شد. با افزایش دمای عملیات حرارتی، جریانی به میزان A/cm2µ 424/0 از سطح گذشت که بازهم از جریان عبوری A/cm2µ  328/1 که مختص زیرلایه بدون پوشش   می­ باشد، کمتر است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect P Content of High and Low Temperature Heat Treatment on the Properties of Ni-P-GO Electroless Nanocomposite Coating on Magnesium Alloy

نویسندگان [English]

  • Mehrdad Hanachi 1
  • Zahra Sadat Seyedraoufi 2

1 M. Sc. Student, Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Alborz, Iran

2 Assistant Professor, Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Alborz, Iran

چکیده [English]

In this study, Ni-P-GO nanocomposite coating was applied on the AZ31D surface by the electroless method. After coating, the crystallization process was carried out at 250 °C and 500 °C temperatures for one hour. As a result, microstructural studies by X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed that a coating with the semi-amorphous cauliflower morphology formed on the surface. Moreover, after the crystallization process not only the morphology was preserved and the coating colony experienced growth, but also the intermediate phase of nickel phosphide was formed. Therefore, the results showed that as P content increases, the tendency to absorb GO nanoparticles increases. At low temperatures, the Ni2P phase was initially formed. However, as the P content and the crystallization temperature increased Ni2P transformed to Ni3P. As a consequence, this improved the hardness due to both precipitation of the intermediate phases and the crystallization process. As the P increased at 500 °C, the energy needed for forming unstable Ni5p < sub>2 and Ni8p < sub>3 phases was provided. The results of the polarization test showed that applying the coating in comparison with the substrate leads to an increase in corrosion resistance. Besides, increasing P in the field increases the density of the hypophosphite layer which leads to an improvement in corrosion resistance. Corrosion resistance diminished as heat treatment was conducted. Also, as the temperature of the heat treatment increased, 0.424 A/cm2µ passed the surface, which is still lower than 1.328 A/cm2µ, this is specific to the uncoated substrate

کلیدواژه‌ها [English]

  • coating
  • Electroless
  • Heat treatment
  • corrosion
  • AZ31D
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