کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1472199 | 990373 | 2007 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An SFG and ERS investigation of the corrosion of CoW0.013C0.001 alloys and WC-Co cermets in CNâ-containing aqueous solutions
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
In order to increase the knowledge of the corrosion mechanism, in situ spectroelectrochemical methodologies were employed in the investigation of the electrochemical interface of WC-Co hardmetals. Together with standard cyclic voltammetries (CV), ElectroReflectance Spectroscopy (ERS) and Sum Frequency Generation (SFG) spectroscopy measurements were performed both on a Co-base alloy, simulating the metallic binder of hardmetal composites, and on a model WC-Co system. A cyanide solution, encountered in the gold extraction industry, was employed as electrolyte. Electrochemical cells and experimental apparatuses were designed to allow in situ experiments. CV measurements showed corrosion attack to run at potentials more anodic than â500 mV vs. Ag/AgCl, both for the alloy and the composite. The high reactivity of the alloy in cyanide environment was witnessed by the time-dependence of the surface vibrational (SFG) and electronic (SFG and ERS) properties under cathodic polarisation. Furthermore, SFG measurements highlighted two different adsorbation sites for cyanide ion, probably α- and ε-Co. The WC-Co system showed a pseudo-passivation peak, typical of the corrosion behaviour of this material, due to precipitation of corrosion products. ERS data at 532 nm showed an ennobling of the potential at which the reflectivity increase was recorded.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 49, Issue 5, May 2007, Pages 2392-2405
Journal: Corrosion Science - Volume 49, Issue 5, May 2007, Pages 2392-2405
نویسندگان
Benedetto Bozzini, Bertrand Busson, Gian Pietro De Gaudenzi, Lucia D'Urzo, Claudio Mele, Abderrahmane Tadjeddine,