Synergism between corrosion and wear on CoCrMo−Al2O3 biocomposites in a physiological solution

Abstract

a b s t r a c tThe use of metal matrix composite structures in biomedical implants can be a solution for decreasing the amount of degradation products. Thus, the present work aims to investigate the synergism between corrosion and wear on CoCrMo matrix 10% (vol) Al 2 O 3 particle reinforced composites in phosphate buffer solution (PBS) at body temperature. Corrosion behavior was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization. Tribocorrosion tests were performed under open circuit potential, as well as under cathodic and anodic potentiostatic conditions using a reciprocating ball-onplate tribometer. Results suggest that the addition of Al 2 O 3 particles did not create a significant effect on corrosion behavior of CoCrMo alloy, however, it increased the wear resistance and decreased the corrosion kinetics when sliding in PBS solution.

Corrosion and Tribocorrosion Behavior of Cast and Machine Milled Co-Cr Alloys for Biomedical Applications

“…6a). Similar wear mechanism was reported by Ribeiro et al in [9], where the synergistic effect of corrosion and wear for CoCrMo-Al 2 O 3 composites was investigated. In comparison, the worn surface topography of the milled Co-Cr alloy was very smooth (Fig.…”

Tribocorrosion behavior of bio-functionalized highly porous titanium

“…When sliding started, a sudden decrease on OCP values was observed for Ti samples due to the mechanical damage on the passive film, leading to the formation of the active sites on the worn surfaces, that is the typical behavior of the passive metals under sliding solicitations (Diomidis et al, 2012;Toptan et al, 2016;Fernandes et al, 2006;Galliano et al, 2001). During sliding, the OCP values were gradually increased that can be attributed to the limited protective role given by the compacted oxide debris (Mathew et al, 2008;Ribeiro et al, 2015;Toptan et al, 2013).…”

“…In addition to the increased pore area (i.e. decreased disturbed metallic surface by rubbing), accumulation of the oxide wear debris into the pores could decrease the effect of the third-body wear, which is another factor that gives a damage to the passive film (Ribeiro et al, 2015;Yan et al, 2009). As a result, the behavior of Ti37 samples may be explained by the combination of all these factors, together with considering the less protective nature of the oxide film formed on the pore, and inner pore surfaces (Alves et al, 2016).…”

Tribocorrosion of Passive Materials: A Review on Test Procedures and Standards

“…Finally, the increasing impact and growing interest of biomedicine over the last decade have led to a great number of studies involving biomedical alloys used in orthopaedic and dental implants [2,[38][39][40], which are subjected to both corrosion and wear as a result of human activity. Biomedical materials such as the CoCrMo [41][42][43] alloy or titanium alloys [44][45][46] have been widely studied in simulated body fluids (SBF), e.g., artificial saliva, NaCl solutions, phosphate buffer saline (PBS) solutions, or foetal bovine serum (FBS) solutions.…”