بررسی اثر درصد سیلیسیوم زیرلایه بر ریزساختار و ترکیب پوشش‌های اکسیداسیون الکترولیتی پلاسمایی آلیاژهای آلومینیوم- سیلیسیوم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 بخش مهندسی مواد، دانشکده فنی و مهندسی دانشگاه شهید باهنر، کرمان، ایران

2 بخش مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه شهید باهنر، کرمان، ایران

3 دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران

4 پردیس علم و فناوری دانشگاه یزد، شرکت یکتا مبدل پارس،یزد، ایران

چکیده

استفاده از روشی سازگار با محیط‌زیست به نام اکسیداسیون الکترولیتی پلاسمایی (PEO) بر آلومینیوم و آلیاژهای آن برای ایجاد درجای پوششی با خواص مطلوب بسیار موردتوجه است. از جمله پارامترهای تأثیرگذار بر روند فرایند PEO و عملکرد پوشش‌های تهیه شده، ترکیب زیرلایه است. در این تحقیق، تأثیر افزایش درصد سیلیسیوم زیرلایه بر فرایند اکسیداسیون الکترولیتی پلاسمایی با جریان پالسی دو قطبی در یک حمام الکترولیتی پایه سیلیکاتی انجام شد. نتایج نشان داد سرعت افزایش ولتاژ مثبت با افزایش مقدار سیلیسیوم درحالت جریان ثابت کاهش می‌یابد و مقادیر ولتاژ مثبت با شروع اکسیداسیون به یکدیگر نزدیک می‌شوند. از میکروسکوپ الکترونی روبشی برای ارزیابی مورفولوژی و ساختار پوشش و از آزمون تفرق اشعه ایکس، برای فازیابی استفاده شد. با افزایش درصد سیلیسیوم زیرلایه از 1 تا 13 درصد وزنی، علاوه بر کاهش ضخامت و زبری پوشش‌ها، متوسط سرعت پوشش‌دهی نیز از 1 به 43/0 میکرومتر بر دقیقه کاهش پیدا کرد. همچنین با افزایش درصد سیلیسیوم زیرلایه مورفولوژی آتشفشانی بر مورفولوژی پنکیکی در رشد پوشش غالب شده و سطحی متخلخل با حفراتی پراکنده در ساختار آن مشاهده شد. نتایج حاصل از آزمون پراش پرتو ایکس نشان داد که، پوشش‌ها عمدتاً حاوی مخلوط γ-Al2O3، η-Al2O3، δ-Al2O3، SiO2، مقدار کمی مولایت و برخی از فازهای آمورف بودند.

کلیدواژه‌ها

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نشریه علوم و مهندسی سطح
دوره 17، شماره 49
آذر 1400
صفحه 1-17

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