پديد آورنده :
عبدالهي، سجاد
عنوان :
بررسي و تعيين پارامترهاي موثر بر خوردگي داخلي لوله هاي فولادي آب با پوشش كولتار اپوكسي در ناحيه خليج فارس
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
خوردگي و حفاظت از مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
سيزده،70ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمود منير واقفي، احمد ساعتچي
استاد مشاور :
مسعود عطاپور
توصيفگر ها :
طيف سنجي امپدانس الكتروشيميايي , فرسايش , دما , آماده سازي سطح
تاريخ نمايه سازي :
15/11/92
استاد داور :
حميدرضا سليمي جزي، عليرضا علافچيان
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
The investigation and the determination of the effective parameters on the internal corrosion of the coal tar epoxy coated water steel tubes in the Persian Gulf area Sajad Abdollahi s abdolahi@ma iut ac ir Date of Submission Sep 17 2013 Department of Materials Engineering IsfahanUniversity of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors S M Monir vaghefi vagh mah@cc iut ac ir A Saatchi asaatchi@cc iut ac ir Abstract Organic coatings are the principal materials of corrosion protection for all steel structures In several applications organic coatings have to show in addition to the anti corrosion properties good resistance to impact and abrasion Thus besides being corrosion resistant the coatings must be resistant to mechanical damage Coal tar epoxy coating are widely used in such situations i e protecting sea water transferring tubes in which the coatings are subjected to sea water and abrasive particles In this work the erosion behavior of coal tar epoxy coating has been evaluated by water sand jet using EIS During erosion tests water containing sand impacted on the coating and resulted in holes throughout it which led to the diffusion of electrolyte to the coating The process discussed reduced the protective performance of the coating After 10 minutes of the erosion test Nyquist curve showed a semicircle with a large radius and the bode curve showed a capacitance behavior meaning high coating resistance about 109 cm2 After 20 and 30 minutes Nyquist semicircle got smaller and smaller and turned into two semicircles after 45 minutes In fact electrolyte penetrated into the coating and led to resistance reduction At this time coating resistance was about 500 cm2 having no protective properties The erosion behavior of the coating was evaluated by mass loss calculation and SEM observation too The erosion of the coating was maximal at low impact angles of about 45 displaying a typical ductile character of the coating However SEM observation showed craters and cracks formation on the coating at impact angle of 90 Therefore the coating character is neither typically ductile nor brittle but a mixture of both These materials are called At impact angle of 90 plastic deformation was observed to be the mechanism of material removal and at oblique impacts erosion occured by the cutting action of the particle Increasing the particle size and percentage in water resulted in erosion increase due to the higher total enrgy of them Corrosion behavior of intact coating was evaluated at different temperatures Increasing corrosion reaction and electrolyte diffusion rates by increasing temperature caused a reduction of the protective performance of the coating Surface preparation effect on coating adhesion was studied It showed that samples with surface preparation had a better adhesion to the substrate Keywords Coal tar epoxy Erosion EIS Temperature Surface preparation PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
محمود منير واقفي، احمد ساعتچي
استاد مشاور :
مسعود عطاپور
استاد داور :
حميدرضا سليمي جزي، عليرضا علافچيان
