تاثیر چگالی جریان بر میکروساختار و رفتار خوردگی پوشش کامپوزیتی Co-P-nanoAl2O3

نوع مقاله: مقاله پژوهشی

نویسندگان

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

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

3 استادیار، بخش مهندسی مواد، دانشکده مهندسی مکانیک و مواد، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران

چکیده

در این تحقیق پوشش کامپوزیتی Co-P-nanoAl2O3 با استفاده از تکنیک رسوب‌دهی الکتریکی به روش جریان مستقیم بر روی زیر لایه AISI 430 پوشش داده شد. میکروساختار و رفتار خوردگی پوشش های ایجاد شده در دانسیته جریان های متفاوت (mA/cm210 و mA/cm2 15 و mA/cm220 و mA/cm2 25) مورد مطالعه قرار گرفت. به منظور بررسی مورفولوژی پوشش و آنالیز پوشش تشکیل شده به ترتیب از دستگاه میکروسکوپ الکترونی روبشی (SEM) و میکرو آنالیز EDS استفاده شد. نتایج نشان داد که پوشش تشکیل شده در دانسیته جریان mA/cm2 15 کاملا یکنواخت و پیوسته است. به منظور بررسی مقاومت به خوردگی، آزمون‌ پلاریزاسیون پتانسیودینامیک در محلول آبی 5/3 درصدوزنی NaCl بر روی نمونه های پوشش دار و بدون پوشش اعمال گردید. نتایج آزمون های پلاریزاسیون تافل و الکتروشیمیایی نیز با تصاویر میکروسکوپی مطابقت داشت و نشان داد که پوشش تشکیل شده در حمام با دانسیته جریان mA/cm2 15 بیشترین مقاومت به خوردگی را دارد.

کلیدواژه‌ها


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