پديد آورنده :
فرزانه، محمدعلي
عنوان :
پوشش دهي الكتريكي و بررسي خواص خوردگي پوشش هاي نانو ساختار نيكل-كبالت-تنگستن
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
مهندسي مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
[هفت]،71ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمدعلي گلعذار،كيوان رئيسي
توصيفگر ها :
نانو كريستال , رسوب الكتريكي , خوردگي امپدانس
تاريخ نمايه سازي :
28/2/90
استاد داور :
احمد ساعتچي، علي اشرفي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت ر نسخه ديجيتالي
چكيده انگليسي :
Electrodeposition and corrosion behavior evalution of Ni W Co nanostructured coatings Mohamad Ali Farzaneh m farzaneh@ma iut ac ir April 12 2010 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors M A Golozar Prof K Raeissi Assoc Prof Abstract The nanostructure Ni Co W and Ni Co alloy coatings were electrodeposited on a copper substrate using different applied current densities in a modified Watts type bath The current densities used were 2 5 5 7 5 15 50 and 70 mAcm 2 and the substrate Scanning electron microscopy SEM and X ray diffraction analysis XRD were employed to study the effect of electrodeposition current density on morphology and grain size of deposits The results showed that morphology of deposits were changed from pyramidal to mixed morphology pyramidal and blocky by increasing the current density A homogeneous nodular surface morphology was obtained at all current densities on Ni Co W coating The coatings were single phase solid solutions with average grain sizes about 6 11 nm calculated from x ray diffraction patterns using the Scherrer equation Grain size was less than the Ni Co coating in similar density currents Electrochemical impedance spectroscopy EIS showed that increasing levels of penetration by surface absorption of ions in the Ni Co W coatings Electrochemical impedance spectroscopy EIS for Ni Co coating showed the effect of hydrogen absorption and formation of intermediate compounds was Nanocrystalline structure Tafel test results done in the solution 3 5 sodium chloride solution showed that nanocrystalline coatings have good corrosion resistance Microhardness test results showed improvement of this parameter in the Ni Co W Coating than Ni Co caoting This improvement is due to the presence of tungsten Microhardness Ni W coating is higher than other coatings and is caused by cobalt in this coating The W and Co contents of the coatings decreased with an increase in the applied current density Keywords Ni Co W Ni Co nanocrystalline electrodeposition corrosion resistance EIS
استاد راهنما :
محمدعلي گلعذار،كيوان رئيسي
استاد داور :
احمد ساعتچي، علي اشرفي
