Influence of Grain Boundaries on Dissolution Behavior of a Biomedical CoCrMo Alloy: In-Situ Electrochemical-Optical, AFM and SEM/TEM Studies
2012 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 159, no 9, C422-C427 p.Article in journal (Refereed) Published
In this study, preferential sites for metal dissolution during anodic polarization were investigated for a biomedical CoCrMo alloy. As-cast and heat treated materials were compared through a combination of complementary techniques. Scanning Kelvin probe force microscopy mapping suggested the matrix areas adjacent to the carbides to be preferential sites for metal dissolution. By means of in situ electrochemical-optical microscopy it was observed that localized dissolution initiated from the matrix areas adjacent to carbides and grain boundaries in both materials at high anodic potential. By using scanning electron microscopy and transmission electron microscopy/energy dispersive spectroscopy analysis, submicron-sized carbides were found along the grain boundaries, and significant Cr depletion was detected across the grain boundaries for both materials, providing an explanation for the initiation of metal dissolution. A slightly higher metal dissolution was observed for the as-cast sample at high anodic potential, probably due to a more heterogeneous microstructure.
Place, publisher, year, edition, pages
2012. Vol. 159, no 9, C422-C427 p.
Probe Force Microscopy, Duplex Stainless-Steel, Cr-Mo Alloy, Corrosion, Implants, Mechanisms, Particles, Depletion, Carbides, Fatigue
IdentifiersURN: urn:nbn:se:kth:diva-104283DOI: 10.1149/2.056209jesISI: 000309104400031ScopusID: 2-s2.0-84875539098OAI: oai:DiVA.org:kth-104283DiVA: diva2:566673
QC 201211092012-11-092012-10-312013-09-27Bibliographically approved