پديد آورنده :
سلطاني، مسعود
عنوان :
بررسي فرايند آندايزينگ در الكتروليت هاي اسيدي و مشخصه يابي پوشش هيبريدي AAO/Ni-P بر روي آلومينيم
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شناسايي و انتخاب مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
پانزده، 101ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
توصيفگر ها :
آندايزينگ , آلومينيم , اسيدسولفوريك , پلاريزاسيون , الكترولس , پوشش هيبريدي
استاد داور :
عباس بهرامي، بهروز موحدي
تاريخ ورود اطلاعات :
1396/05/09
چكيده انگليسي :
102 Evaluation of anodizing process in acidic electrolytes and characterization of hybrid coating AAO Ni P on aluminium Masoud Soltani Email address masoud soltani@ma iut ac ir Date of Submission June 18 2017 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M S Language Farsi Supervisor Ali Shafyei Professor Email Shafyei@cc iut ac irAbstractAnodizing as an electrochemical coating method has been widely used in aerospace industry nanomaterials and aoutomobile manufacturing Pourous coating is formed by aluminium anodizingon the metal that is considered from two viewpoints The first viewpoint is related to porouscoating parameters such as interpore distance and pore diameter These parameters are used in thedeposition of various metals to attainment the proper magnetic properties The second viewpoint isabout improving the surface properties of aluminium erospace alloys such as hardness andcorrosion resistance In the first part of this study mild and hard anodizing in various voltage andelectrolyte was prformed on pure and aluminium alloy 1100 Study of current voltage curvesduring the anodization and field emission scanning electron microscope FESEM images showed ahigh increase wasw happened in current level with adding acid sulfuric to electrolyte The presenceof alloying elements decreased quality of coating and reduced growth rate af oxid layer Increasingof electrolyte tempreture led to increase in anodizing current and growth rate of oxide layer Porediameter barrier layer thickness and interpore distance were dependent on the voltage and currentis only effective on the growth rate and thickness of the oxide layer In the second part of thisstudy anodization process in acid sulfuric at three different voltages 25 30 35V and two differenttempretures 0 10 were conducted on aerospace aluminium alloy AA2024 The anodiccoatings were characterizied by x ray diffraction XRD grazing incidence x ray diffraction GIXRD scanning electron microscope SEM FESEM microanalysis EDS microhardness roughness and thickness measurement The results indicated that the sample thickness increasedwith increasing the voltage and the temperature At both tempreture there is an optimum levelbetween coating voltage 30V and microhardness and also coating voltage and roughness The bestorder of nanocells in the AAO was obtained in 35V and 10 Tow step anodizing processimproves the order of nanocells by reduction of void space between nanocells According to thepotantiodynamics polarization curves of anodized aluminium at 0 and different voltage the bestcorrosion resistanc was obtained in 25V Finally the possibility of production of hybride cotaingAAO Ni P on aluminium alloy2024 by electroless plating was studied By this coating corrosionrate reduced about 92 compared to anodized aluminum alloy2024 Heat treatment of hybridecoating was performed at 200 400 600 and the maximum value of coating microhardness wasabout 1190 vickers at 400 whereas this value of hardness is significant for aluminium alloy 2024 Key words Anodizing Aluminum Sulfuric acid Polarization Electroless Hybrid coating
استاد داور :
عباس بهرامي، بهروز موحدي
