Influence of protein adsorption on tribocorrosion behaviour of CoCrMo biomedical-grade alloys

Namus, Righdan; Rainforth, W.M.

doi:10.1016/j.triboint.2020.106364

Cited by 24 publications

(8 citation statements)

References 36 publications

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“…Samples were used for tribocorrosion testing directly after grinding procedures. This procedure is in line with others working within this field [47][48][49][50] and in line with ASTM G5 [51] and G59 [52] guidance.…”

Section: Cocrmo Samplessupporting

confidence: 84%

The Effect of Protein Structure and Concentration on Tribocorrosion and Film Formation on CoCrMo Alloys

2021

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The formation of tribochemical reaction layers, better known as tribofilms, on cobalt-chromium-molybdenum (CoCrMo) alloys commonly used in orthopaedic applications has been hypothesized to reduce degradation owing to wear and corrosion. However, the mechanisms and pathways influencing tribofilm formation remain largely unknown. This study aims to develop a clearer understanding of the role of protein structures and its concentration on tribocorrosion and surface tribofilms formed on CoCrMo alloys during boundary regime sliding. A reciprocating tribometer with a three-electrode electrochemical cell was employed to simulate and monitor the tribocorrosion of CoCrMo in situ. As-received Foetal Bovine Serum (as-FBS) and pre-heated FBS at 70 °C for 1 h (de-FBS) were diluted with saline (0.9% NaCl) at different concentrations (25% and 75% v/v) and utilized as electrolytes during the tribocorrosion tests. The result shows that the denatured protein structure in electrolyte tends to reduce the volume losses due to wear and corrosion on the CoCrMo samples with an appreciation of the protein tribofilms. On the other hand, an increased protein concentration increased the total volume loss due to corrosive processes. A novel finding revealed in this study is that the tribocorrosion mechanism of the CoCrMo surface is dependent on the protein structure, concentration and sliding duration due to the change in surface condition.

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Section: Cocrmo Samplessupporting

confidence: 84%

The Effect of Protein Structure and Concentration on Tribocorrosion and Film Formation on CoCrMo Alloys

2021

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“…Finally, the applied simulated joint fluid does not entirely represent the variable and complex composition of pseudo-synovial fluid. Yet, the same or similar compositions have been implemented by other studies to approximate the protein influence in a tribocorrosion system [51]. Finally, we acknowledge that other constituents, such as hyaluronic acid, would be worthwhile to be included in future studies [52][53][54].…”

Section: Subsurface Characterizationmentioning

confidence: 94%

Effect of Potential and Microstructure on the Tribocorrosion Behaviour of Beta and Near Beta Ti Alloys II

Neto

Rainforth

2021

J Bio Tribo Corros

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Titanium alloys, especially Ti6Al4V, are commonly applied in orthopaedic implants as a result of their relatively low density, good corrosion properties, satisfactory biocompatibility and bone ingrowth promoting properties. However, Ti implants are susceptible to mechanical failure. Although corrosion and wear related problems have been recognized as a major issue impeding their long-term application, there is still a lack of knowledge about the basic mechanisms. Previously, the tribocorrosion properties of 4 distinct titanium alloys (Ti13Nb13Zr, Ti12Mo6Zr2Fe, Ti29Nb13Ta4.6Zr aged at 300 °C and at 400 °C) was analysed in the published Part I of this study in regard to wear rates, electrochemical behaviour, and the tribocorrosion synergism estimations. This work, Part II, contributes to the previous study and investigates the tested surfaces of these 4 Titanium alloys from the same tribosystem aiming to characterize the wear track surfaces and identify the main wear mechanism, to characterize the tribofilm and to investigate the subsurface alterations occurring under varying contact pressures and electrochemical potentials. The results indicated a dominant abrasion wear mechanism regardless of microstructure, electrochemical potential and normal load (contact pressure). Additionally, grain refinement observed on the subsurface varied with alloy and electrochemical potential, with the variation being mostly independent of alloy microstructure. Finally, a graphitic tribofilm was detected in most conditions, which while inconsequential in regard to wear, may explain the previously observed reduction of friction. Graphic Abstract

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“…Thus, -0.9 V cathodic potential was chosen to reduce this effect. The influence of cathodic potential on the adsorption of protein on the corrosion and tribocorrosion behavior of CoCrMo alloys in simulated body fluid has previously been studied [28], [29]. No hydrogen evolution was observed under the used cathodic potential.…”

Section: Work Procedures For Tribocorrosion Testingmentioning

confidence: 99%

Effect of grain size and crystallographic structure on the corrosion and tribocorrosion behaviour of a CoCrMo biomedical grade alloy in simulated body fluid

Namus

Rainforth

Huang

et al. 2021

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Influence of protein adsorption on tribocorrosion behaviour of CoCrMo biomedical-grade alloys

Abstract: This is a repository copy of Influence of protein adsorption on tribocorrosion behaviour of CoCrMo biomedical-grade alloys.

Cited by 24 publications

References 36 publications

The Effect of Protein Structure and Concentration on Tribocorrosion and Film Formation on CoCrMo Alloys

The Effect of Protein Structure and Concentration on Tribocorrosion and Film Formation on CoCrMo Alloys

Effect of Potential and Microstructure on the Tribocorrosion Behaviour of Beta and Near Beta Ti Alloys II

Effect of grain size and crystallographic structure on the corrosion and tribocorrosion behaviour of a CoCrMo biomedical grade alloy in simulated body fluid

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