مجله علوم، مهندسی و فناوری هسته‌ای

اثر زمان و تنش کششی بر رفتار خوردگی آلومینیم 5052 در الکترولیت‌های NaCl و Na2SO4

نوع مقاله : مقاله پژوهشی

نویسندگان

هادی عادلخانی 1
فاطمه پارسایان 1
لیلا ایران نژاد 2

1 پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران

2 آزمایشگاه مرکزی، ﭘﮋوﻫﺸﮕﺎه ﻋﻠﻮم و ﻓﻨﻮن ﻫﺴﺘﻪای، ﺳﺎزﻣﺎن اﻧﺮژی اﺗﻤﯽ اﯾﺮان، صندوق پستی: 8486-11365، تهران- ایران

https://doi.org/10.24200/nst.2024.1644
چکیده
در این مقاله، آلیاژ ۵۰۵۲ به‌عنوان یکی از آلیاژهای پیشنهادی آلومینیم برای استفاده در ساخت غلاف سوخت‌های هسته‌ای، انتخاب و رفتار خوردگی آن در الکترولیت حاوی NaCl و Na2SO4 مورد مطالعه قرار گرفته است. از رو‌ش‌های پلاریزاسیون پتانسیودینامیکی و امپدانس الکتروشیمیایی برای مطالعات خوردگی و از روش‌های میکروسکوپ الکترونی روبشی (Scanning Electron Microscopy, SEM)، طیف‌سنجی تبدیل فوریه فروسرخ (Fourier-Transform Infrared Spectroscopy, FTIR) و پراش پرتو ایکس (X-ray Diffraction, XRD) برای مطالعات مورفولوژی و مشخصه‌یابی محصولات خوردگی آلومینیم 5052 استفاده شده است. در الکترولیت Na2SO4 افزایش زمان تماس الکترولیت با نمونه، باعث بهبود مقاومت خوردگی نمونه شده است به‌طوری‌که جریان خوردگی کاهش یافته (جریان خوردگی از 5.4- mA/cm2 10 برای 1 ساعت به mA/cm2 10-6 برای 11 روز رسیده است) و آلومینیم 5052 محدوده پتانسیل روئین‌شدگی گسترده‌تر و جریان روئین‌شدگی کمتری را در 11 روز نشان داده است. در الکترولیت NaCl، افزایش زمان تماس الکترولیت تقریباً باعث حذف منطقه روئین‌شدگی شده است. ایجاد خوردگی حفره‌ای و تشدید اندازه/ تعداد حفره‌ها از دیگر اثرات مشاهده شده به‌دلیل افزایش زمان تماس الکترولیت NaCl با آلومینیم 5052 است. این نتایج نشان می‌دهد که با افزایش زمان تماس الکترولیت با نمونه‌ها، ترکیب شیمیایی الکترولیت (حضور یا عدم حضور آنیون‌های کلر و سولفات) بیشتر بر رفتار روئین‌شدگی آلومینیم 5052 تأثیرگذار است. همچنین اعمال تنش کششی، اثری تخریبی بر لایه روئین‌کننده را نشان داد. به‌طوری‌که اعمال تنش باعث حذف رفتار روئین‌شدگی در آلومینیم 5052 شده است.

کلیدواژه‌ها

آلومینیم
آلیاژ ۵۰۵۲
خوردگی
غلاف سوخت
زمان
تنش کششی

عنوان مقاله English

The effect of time and tensile stress on the corrosion behavior of aluminum 5052 in NaCl and Na2SO4 electrolytes

نویسندگان English

H. Adelkhani 1
F. Parsayan 1
L. Irannejad 2
1 Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran – Iran
2 Central Laboratory, Nuclear Science and Technology Research Institute, AEOI, P.O.BOX: 11365-8486, Tehran – Iran
چکیده English

In this paper, aluminum 5052 (AA 5052), one of the candidate alloys for nuclear fuel cladding, has been selected for study regarding its corrosion behavior in an electrolyte containing NaCl and Na2SO4. Potentiodynamic polarization and electrochemical impedance methods were used to investigate the corrosion of AA 5052. The morphology and characterization of corrosion products were carried out using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Fourier-Transform Infrared Spectroscopy (FTIR) methods. In the Na2SO4 electrolyte, the corrosion resistance of the sample improved over time, with the corrosion current decreasing from 10-5.4 mA/cm2 after 1 hour to 10-6 mA/cm2 after 11 days. AA 5052 showed a wider passivation potential range (ΔEpass) and less passivation current (ipass) after 11 days. In the NaCl electrolyte, pitting corrosion, elimination of the passivation zone, and an increase in the number and size of pits were observed with increased time. These results confirm that the time has an influence on the passivation behavior of AA 5052, primarily dependent on the chemical composition of the electrolyte (presence or absence of chlorine and sulfate anions). Additionally, the application of tensile stress showed a destructive effect on the passive layer, as the passivation behavior of AA 5052 was eliminated.

کلیدواژه‌ها English

Aluminum
AA 5052
Corrosion
Fuel clad
Time
Tensile stress
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