پديد آورنده :
عادلي، منصور
عنوان :
ارزيابي خوردگي حفره اي فولاد زنگ نزن دو فازي 2205 در محيط اسيد استيك و تاثير آنيون هاي مهاجم كلريد/برميد و بازدارنده نيتريت
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
هشت،88ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمد علي گلعذار
استاد مشاور :
كيوان رئيسي
توصيفگر ها :
برميد سديم , كلريد سديم , نيتريت سديم , بازدارندگي خوردگي
تاريخ نمايه سازي :
9/10/88
استاد داور :
ابراهيم حشمت دهكردي، احمد ساعتچي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Pitting corrosion of 2205 duplex stainless steel in acetic acid solution and effects of aggressive anions and nitrite inhibitor Mansour Adeli m adeli@ma iut ac ir July 18 2009 Department of Materials Engineering Isfahan University of Technology 84156 83111 Isfahan IranDegree M Sc Language FarsiProf Mohammad Ali Golozar Supervisor E mail golozar@cc iut ac irAssoc Prof Keyvan Raeissi Advisor E mail k raeissi@cc iut ac irAbstractIn this research pitting corrosion behavior of 2205 duplex stainless steel in acetic acidsolution was investigated Using cyclic polarization tests effects of different concentrations0 01 0 1 0 2 and 0 5M sodium bromide and sodium chloride on the pitting corrosion of 2205stainless steel was studied In addition effects of temperature and nitrite inhibitor were alsoinvestigated Pitting potential was found to be decreased by increasing the temperature andbromide ion concentration In the presence of chloride ions pitting corrosion was notobserved at room temperature Critical Pitting Temperature CPT and Critical ProtectionTemperature CPrT in the chloride solution was estimated to be below 45 C The pittedsurfaces were inspected by SEM after anodic polarization readings and showed that pitsinitiate in the austenite phase The results of Electrochemical Impedance Spectroscopy EIS and mott schottky tests showed that by increasing the temperature thickness of passive filmis decreased and donor density of passive film is increased Pitting potential was decreased byincreasing the nitrite concentration and proper inhibition efficiency was achieved by thepresence of 500 to 1000ppm of NO 2 anion EIS measurements showed that the chargetransfer resistance increases and double layer capacitance decreases with increase in thenitrite concentration Cyclic potentiodynamic polarization readings showed that the nitriteanions act anodically Key WordsDuplex stainless steel Pitting corrosion Sodium bromide Sodium chloride Sodium nitrite Corrosion inhibition
استاد راهنما :
محمد علي گلعذار
استاد مشاور :
كيوان رئيسي
استاد داور :
ابراهيم حشمت دهكردي، احمد ساعتچي
