Electrochemical corrosion of silicon carbide ceramics / U. Sydow in Materials and corrosion, Vol. 61 N° 8 (Août 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 8 (Août 2010) . - pp. 657–664 Titre : Electrochemical corrosion of silicon carbide ceramics Type de document : texte imprimé Auteurs : U. Sydow, Auteur ; M. Schneider, Auteur ; M. Herrmann, Auteur Année de publication : 2010 Article en page(s) : pp. 657–664 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion  silicon carbide Résumé : Recently, SiC-based ceramics have been found to exhibit corrosion damage patterns, which can only be explained by electrochemical processes. Therefore, the current work focusses on the electrochemical test procedures to determine the corrosion behaviour of solid state sintered silicon carbide (SSiC) ceramics in acidic and alkaline media. The corrosion current densities have been determined from linear voltammetric scans. At anodic polarization potentials, electrochemically induced etching patterns were observed in alkaline solution. The formation of pores and crevices during electrochemical oxidation in acidic solution could be monitored by field emission scanning electron microscopy (FESEM) in addition to transmission electron microscopy (TEM). Impedance spectra measured after anodic polarization could be described by the assumption of a pore model equivalent circuit. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905448/abstract [article] Electrochemical corrosion of silicon carbide ceramics [texte imprimé] / U. Sydow, Auteur ; M. Schneider, Auteur ; M. Herrmann, Auteur . - 2010 . - pp. 657–664. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 8 (Août 2010) . - pp. 657–664 Mots-clés : Corrosion  silicon carbide Résumé : Recently, SiC-based ceramics have been found to exhibit corrosion damage patterns, which can only be explained by electrochemical processes. Therefore, the current work focusses on the electrochemical test procedures to determine the corrosion behaviour of solid state sintered silicon carbide (SSiC) ceramics in acidic and alkaline media. The corrosion current densities have been determined from linear voltammetric scans. At anodic polarization potentials, electrochemically induced etching patterns were observed in alkaline solution. The formation of pores and crevices during electrochemical oxidation in acidic solution could be monitored by field emission scanning electron microscopy (FESEM) in addition to transmission electron microscopy (TEM). Impedance spectra measured after anodic polarization could be described by the assumption of a pore model equivalent circuit. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905448/abstract

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In-situ investigation of the surface-topography during anodic dissolution of copper under near-ECM conditions / M. Schneider in Materials and corrosion, Vol. 63 N° 2 (Fevrier 2012)  

Public ISBD [article]  inMaterials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 96–104 Titre : In-situ investigation of the surface-topography during anodic dissolution of copper under near-ECM conditions Type de document : texte imprimé Auteurs : M. Schneider, Auteur ; S. Schroth, Auteur ; N. Schubert, Auteur Année de publication : 2012 Article en page(s) : pp. 96–104 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : anodic copper dissolution  electrochemical machining  in-situ microscopy Résumé : Electrochemical machining is characterized by deliberate high speed anodic dissolution. The distance between anode and cathode are only a few hundred microns. Additionally, the electrolyte flow rate is in the range of approximately meter/second. A special electrochemical cell design was developed to investigate the surface topography during the anodic dissolution simultaneously and in-situ under near-ECM conditions. The anode was directly placed under the cathode with a gap of 350 µm. We carried out pulse experiments at 15 A/cm2 and 25 A/cm2 with an electrolyte flow rate of 4m/s. First-time it was possible to observe the surface changing of the anode directly during current pulses by using a video camera. Different stages e.g. roughening, film formation or gas evolution could be distinguished. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005716/abstract [article] In-situ investigation of the surface-topography during anodic dissolution of copper under near-ECM conditions [texte imprimé] / M. Schneider, Auteur ; S. Schroth, Auteur ; N. Schubert, Auteur . - 2012 . - pp. 96–104. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 96–104 Mots-clés : anodic copper dissolution  electrochemical machining  in-situ microscopy Résumé : Electrochemical machining is characterized by deliberate high speed anodic dissolution. The distance between anode and cathode are only a few hundred microns. Additionally, the electrolyte flow rate is in the range of approximately meter/second. A special electrochemical cell design was developed to investigate the surface topography during the anodic dissolution simultaneously and in-situ under near-ECM conditions. The anode was directly placed under the cathode with a gap of 350 µm. We carried out pulse experiments at 15 A/cm2 and 25 A/cm2 with an electrolyte flow rate of 4m/s. First-time it was possible to observe the surface changing of the anode directly during current pulses by using a video camera. Different stages e.g. roughening, film formation or gas evolution could be distinguished. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005716/abstract

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