پديد آورنده :
موسوي، روح الله
عنوان :
ايجاد پوشش نانوساختاري Ni-MO به روش رسوب الكتريكي و ارزيابي خواص الكتروكاتاليزوري و مقاومت به خوردگي آن
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
خوردگي و حفاظت از مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
يازده، 95، [II] ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به: فارسي و انگليسي
استاد راهنما :
احمد ساعتچي، كيوان رئيسي
توصيفگر ها :
ويليامسون-هال , قانون فاراده , آلياژهاستوليB
تاريخ نمايه سازي :
11/03/87
استاد داور :
محمد علي گلعذار، حشمت دهكردي
چكيده فارسي :
به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال
چكيده انگليسي :
AbstractNi Mo allays have a wide appilication due to their ability to provide low hydrogen evolutionoverpotentials In this project Ni Mo coatings were deposited from a bath contains SodiumCitrate Nickel Sulphate and Sodium Molybdate At first the effect of parameters such as pHfrom 7 to 10 5 temperatures 24 C and 40 C current density 10 30 and 100 mA cm2 present of ammonia in bath and coating annealing were investigated Using EG Gpotentiostat model 263A and EG G AC responser Model 1025 polarisation andElectrochemical Impedance Spectroscopy EIS curves were plotted Morphology andchemical composition were investigated using Scanning Electron Microscope SEM andEnergy Dispersive Spectroscopy EDS respectively The results show that polarisationcurves were shifted to the left hand with decreasing temperature and increasing pH EISresults showed that the second time constant observed at low temperature indicating ondiffusion controlled behavior of deposition process was disappeared by increasing thetemperature from ambient temperature 24 C to 40 C or increasing pH from 7 to 9 Increaseof coating compactness by increasing temperature and pH was detected by SEM observationsthat pH has a made strong effect on the properties of deposits When pH increase from 8 to10 5 Mo content of deposit decreased from 45 wt to 20 4 wt Increasing pH to 10 5created a diffusion controlled regime Corrosion and electrocatalytic behavior of deposits in 10wt NaOH was also investigated The results showed that Ni Mo deposits show active passive and transpassive regions and has a high resistance to pitting corrosion By adding Moto Ni its electrocatalytic behavior could be improved but raising the Mo percentage greaterwt reduced its electrocatalitic properties
استاد راهنما :
احمد ساعتچي، كيوان رئيسي
استاد داور :
محمد علي گلعذار، حشمت دهكردي
