کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
190601 459702 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical investigation of oxide films formed on nickel alloys 182, 600 and 52 in high temperature water
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical investigation of oxide films formed on nickel alloys 182, 600 and 52 in high temperature water
چکیده انگلیسی

Nickel-based alloys 182, 600 and 52 were exposed to simulated Pressurized Water Reactor (PWR) primary water (1000 ppm B, 2 ppm Li, O2 <10 ppb, 325 °C) under different dissolved hydrogen (DH) conditions [0, 2, 25 and 50 cm3 H2(STP) kg−1] for times up to 1 month in a recirculating autoclave. The influence of exposure time and DH on oxide films formed on the alloys was evaluated by means of electrochemical tests; electrochemical impedance spectroscopy (EIS) and Mott–Schottky (M–S). The in situ EIS was performed every day, allowing the monitoring of the oxide layer formation and change. M–S was performed at room temperature after the full exposure time. The results showed that the maximum in the defect concentrations obtained via M–S analysis and the maximum crack growth rate are at the same DH content, thus relating electrochemical testing to stress corrosion cracking observations. A conceptual separation between the electrochemical behavior of (1) the oxide layer (visible in the higher frequencies of EIS) and (2) the oxide layer – solution interface (visible in the lower frequencies of EIS) was able to explain the effect of hydrogen on the low-frequency EIS impedance results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 56, Issue 23, 30 September 2011, Pages 7871–7879
نویسندگان
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