dc.contributor | Universidade Estadual Paulista (Unesp) | |
dc.contributor | Univ Barcelona | |
dc.date.accessioned | 2014-05-20T14:18:05Z | |
dc.date.accessioned | 2022-10-05T15:15:19Z | |
dc.date.available | 2014-05-20T14:18:05Z | |
dc.date.available | 2022-10-05T15:15:19Z | |
dc.date.created | 2014-05-20T14:18:05Z | |
dc.date.issued | 2006-10-01 | |
dc.identifier | Corrosion Science. Oxford: Pergamon-Elsevier B.V., v. 48, n. 10, p. 2998-3013, 2006. | |
dc.identifier | 0010-938X | |
dc.identifier | http://hdl.handle.net/11449/25445 | |
dc.identifier | 10.1016/j.corsci.2005.10.016 | |
dc.identifier | WOS:000241618700010 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/3898547 | |
dc.description.abstract | In the present work the corrosion resistance of micro-cracked hard chromium and Cr3C2-NiCr (HVOF) coatings applied on a steel substrate have been compared using open-circuit potential (E-OC) measurements, electrochemical impedance spectroscopy (EIS) and polarization curves. The coatings surfaces and cross-section were characterized before and after corrosion tests using optical microscopy (OM) and scanning electron microscopy (SEM). After 18 h of immersion, the open-circuit potential values were around -0.50 and -0.25V/(Ag vertical bar AgCl vertical bar KClsat) for hard chromium and Cr3C2- NiCr, respectively. The surface analysis done after 12 h of immersion showed iron on the hard chromium surface inside/near surface cracks, while iron was not detected on the Cr3C2-NiCr surface even after 18 h. For longer immersion time hard chromium was more degraded than thermal sprayed coating. For hard chromium coating a total resistance values between 50 and 80 k Omega cm(2) were measured and two well-defined time constants were observed, without significant change with the immersion time. For Cr3C2-NiCr coating the total impedance diminished from around 750 to 25 k Omega cm(2) as the immersion time increased from 17 up to 132 h and two overlapped time constants were also observed. Polarization curves recorded after 18 h of immersion showed a lower current and higher corrosion potential for Cr3C2-NiCr coating than other samples studied. (c) 2005 Elsevier Ltd. All rights reserved. | |
dc.language | eng | |
dc.publisher | Elsevier B.V. | |
dc.relation | Corrosion Science | |
dc.relation | 4.862 | |
dc.rights | Acesso restrito | |
dc.source | Web of Science | |
dc.subject | corrosion resistance | |
dc.subject | EIS | |
dc.subject | HVOF | |
dc.subject | thermal spray | |
dc.subject | Cr3C2-NiCr | |
dc.subject | hard chromium | |
dc.title | Comparative study of Cr3C2-NiCr coatings obtained by HVOF and hard chromium coatings | |
dc.type | Artigo | |