کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
194886 459802 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of nanocrystallization on passive behavior of Ni-based superalloy in acidic solutions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Influence of nanocrystallization on passive behavior of Ni-based superalloy in acidic solutions
چکیده انگلیسی

The electrochemical corrosion behaviors of Ni-based superalloy nanocrystalline coating (NC) fabricated by a magnetron sputtering technique have been investigated in comparison with cast alloy in 0.25 M Na2SO4 + 0.05 M H2SO4 and 0.5 M NaCl + 0.05 M H2SO4 solution, respectively. Compared with cast alloy, the NC coating had a little higher passive current density in Na2SO4 acidic solution, while it had superior resistance to pitting corrosion in NaCl acidic solution. The semiconductive type of passive film of the NC coating was p-type in both acidic solutions, while, that of cast alloy changed from p-type in Na2SO4 acidic solution to n-type in NaCl acidic solution. XPS results indicated that Cr2O3 was the main component for the passive films of the NC coating as well as those of the cast alloy. No chloride ion was found in the passive film of NC coating while it was in the passive film of cast alloy. The chloride ions adsorbing on the surface of cast alloy incorporated into the passive film, which induced the formation of n-type oxide film. The nanocrystallization of Ni-base superalloy obviously weakened the adsorption of chloride ions on surface, which decreased the susceptibility of pitting corrosion in acidic solution.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 52, Issue 7, 1 February 2007, Pages 2392–2400
نویسندگان
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