نویسندگان
1 کارشناس ارشد، دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌های فنی، دانشگاه تهران
2 استاد، دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌های فنی، دانشگاه تهران
چکیده
مس به دلیل هدایت حرارتی خوب کاربرد وسیعی در صنایع خصوصاً در فرآیندهای مربوط به سیالات دارد، لذا بالا بردن مقاومت به خوردگی آن از اهمیت قابل توجهی برخوردار است. در این تحقیق پوشش های نانو کامپوزیتی مس-نانو کاربید سیلیسیم با استفاده از جریان پالسی در حمام سولفاتی و با دانسیته جریان های متفاوت بر روی زیرلایه مسی ایجاد شد و تاثیر این متغیر و آماده سازی سطح بر روی خواص پوشش بررسی شد. مطابق با نتایج انجام مراحل آماده سازی منجر به یکنواخت تر شدن و کاهش عیوب سطحی شد و متعاقبا مقاومت به خوردگی نیز بهبود یافت. همچنین افزایش دانسیته ی جریان ماکزیمم منجر به ریز دانه تر شدن و افزایش درصد تخلخل شد و کاهش دانسیته جریان ماکزیمم منجر به افزایش درصد ذرات شد اما مقدار بهینه ی دانسیته جریان ماکزیمم 2-A.dm12 بدست آمد که در آن بالاترین میکرو سختی و کمترین نرخ خوردگی برای پوششها به ترتیب Hv193وmA/cm2008/0 بدست آمد.
کلیدواژه‌ها
عنوان مقاله [English]
The effect of substrate preparation and the peak current density in pulse platingof Cu-SiCnanocompositecoatingsonmorphology, grain size, porosity, hardness and corrosion properties
نویسندگان [English]
- S.M. Mirsaeedghazi 1
- S.R. Allahkaram 2
1 School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran
2 School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran
چکیده [English]
Copper is widely used in different industries due to its good thermal and electrical conductivity.However, it can be in contact with fluid environments in these applications and thus, its corrosion properties are also important. In this study, copper/silicon carbide nano-composite coatings were deposited on copper substrates from sulfate bath by pulsed current and different current densities. The effects of copper surface preparation and current density on grain size, morphology,hardness, porosity, and corrosion properties of the coatings were investigated. Results revealed that, surface preparation before electrodeposition leaded to more uniform and less defective coatings. Grain size and porosity percent were decreased by increasing of current density. However, incorporation of nano-particles was also decreased by increasing of current density. Therefore, the optimum peak current density was achieved at 12A.dm-2at whichthe highest micro-hardness and thelowestcorrosion rateof the coatingsrespectively193 Hv and 0.008mA/cm2 obtained
کلیدواژه‌ها [English]
- copper
- silicon carbide
- porosity
- surface preparation
- corrosion
- composite
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