Lifecycle of cobalt-based alloy for artificial joints: From bulk material to nanoparticles and ions due to bio-tribocorrosion

doi:10.1016/j.jmst.2019.12.010

Abstract

Abstract:

The release of debris and ions from metallic artificial joints during bio-tribocorrosion posed a severe threat to patient health. In this work, the lifecycle of a CoCrMo alloy was presented by investigating the subsurface microstructure transformation in-vitro. The results showed that the originally coarse grains changed to nano-grains (NGs) on the top region of the alloy, and nanoparticles (NPs) were torn off the surface, which were then blocked by the tribo-film. The agglomerated alloy NPs contained in the tribo-film transformed into debris after being removed from the alloy surface. The majority of the torn-off NPs were corroded and released ions into solution due to their high chemical activities.

Key words: Cobalt-based alloy, Artificial joints, Wear mechanism, Bio-t, Ribocorrosion, TEM

Zhongwei Wang, Yu Yan, Yang Wang, Yanjing Su, Lijie Qiao. Lifecycle of cobalt-based alloy for artificial joints: From bulk material to nanoparticles and ions due to bio-tribocorrosion[J]. J. Mater. Sci. Technol., 2020, 46: 98-106.

Figures/Tables 14

Table 1 The chemical composition of the CoCrMo alloy used in the study.

Element	Co	Cr	Mo	C	Ni	Si	Mn
Composition (wt.%)	Bla.	28.3	5.4	~0.2	<1.0	<1.0	<1.0

Fig. 1. (a) Schematic overview of the bio-tribocorrosion test set-up; (b) the counterpart; (c) the macrograph of worn sample after the long-time bio-tribocorrosion test.

Fig. 2. (a) SEM image of the microstructure of the CoCrMo alloy and (b) X-Ray diffraction pattern of the CoCrMo alloy.

Fig. 3. Potentiodynamic polarization curves of CoCrMo alloy in normal condition and during wear.

Fig. 4. Evolution of the OCP and COF during the long time bio-tribocorrosion test.

Fig. 5. SEM images of the CoCrMo alloy surface before and after the bio-tribocorrosion test.

Fig. 6. TEM bright field images of the CoCrMo alloy cross sections (a) before and (b) after the bio-tribocorrosion test.

Fig. 7. (a) Stacking faults formed under the worn CoCrMo alloy surface and (b) the SAED result of the area marked by the circle in (a); (c) (d) the intersected stacking faults.

Fig. 8. TEM bright and dark field images of (a), (d) the NGs layer, (b), (e) the bottom region of the tribo-film and (c), (f) the top region of the tribo-film; the SAED results were inserted in (a) and (b).

Fig. 9. (a), (b) TEM bright field images of the debris recorded under different magnifications and (c) EDX chemical elements analysis of the debris.

Fig. 10. HR-TEM images of the NPs in debris with different shapes.

Table 2 The interplanar spacing of the NPs present in the debris and the standard interplanar spacing of some reference materials.

NPs	Interplanar spacing/?	Reerence substance	Interplanar spacing/?
# 1	1.960	CrO₃(122)	1.964
# 2	1.963
# 3	2.002	HCP-CoCrMo (0002)	2.007
# 4	2.405	MoO₂(002)	2.402
# 5	2.766	MoO₂(-102)	2.763
# 6	2.766
# 7	2.809	Cr₈O₂₁(0-23)	2.811
# 8	2.813
# 9	2.817	Cr₅O₁₂(122)	2.814
# 10	2.817	Cr₂O₅(312)	2.823
# 11	2.833	Co₃O₄(220)	2.848
# 12	2.853	Cr₃O₄(112)	2.860

Fig. 11. The ion concentrations in the supernatant.

Fig. 12. Schematic overview of the life-cycle of the CoCrMo alloy during bio-tribocorrosion.

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