Influence of Grain Boundaries on Dissolution Behavior of a Biomedical CoCrMo Alloy: In-Situ Electrochemical-Optical, AFM and SEM/TEM Studies

被引:42
作者
Bettini, Eleonora [1 ]
Leygraf, Christofer [1 ]
Lin, Changjian [2 ,3 ]
Liu, Ping [4 ]
Pan, Jinshan [1 ]
机构
[1] KTH Royal Inst Technol, Sch Chem Sci & Engn, Dept Chem, Div Surface & Corros Sci, SE-10044 Stockholm, Sweden
[2] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China
[3] Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China
[4] Sandvik Mat Technol, SE-81181 Sandviken, Sweden
关键词
PROBE FORCE MICROSCOPY; DUPLEX STAINLESS-STEEL; CR-MO ALLOY; CORROSION; IMPLANTS; MECHANISMS; PARTICLES; DEPLETION; CARBIDES; FATIGUE;
D O I
10.1149/2.056209jes
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
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. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.056209jes] All rights reserved.
引用
收藏
页码:C422 / C427
页数:6
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