کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1471097 990341 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical behaviour of Ni-base alloys exposed under oil/gas field environments
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Electrochemical behaviour of Ni-base alloys exposed under oil/gas field environments
چکیده انگلیسی

The electrochemical behaviour of Ni-base alloys (Inconel 625, Inconel 718, G3 and Incoloy 825) is carried out at 80 °C in CO2/H2S corrosion environments using cyclic potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) techniques. The passivity mechanisms are analysed and discussed. In addition, some significant characterisation parameters such as Ecorr, Ipass, Epit, Epp, ΔE and Ipass in cyclic polarisation curves are analysed and compared to reveal the corrosion resistance of various Ni-base alloys. The equivalent circuit model and ZsimpWin software are utilised to discuss the Nyquist plots of various Ni-base alloys. The diffusion mechanism in EIS measurement is discussed. The result shows that the corrosion resistance of the Ni-base alloys to CO2 corrosion or CO2/H2S corrosion follows the sequence: Inconel 625 > G3 > Inconel 718 > Incoloy 825. H2S works as a cathodic depolariser with accelerating initiation of the corrosion process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 51, Issue 8, August 2009, Pages 1702–1706
نویسندگان
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