Tribocorrosion

Wood, R.J.K.

doi:10.1002/9781118694404.ch15

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…In the presence of the proteins, especially with the larger protein Fbn present, the COF and wear track width decreased significantly. The lubricating action of the proteins dominated the tribocorrosion process during the 60 min period tested, which is similar to other studies. − Also, as visible from no significant Mo oxide buildup in the wear track (XPS), the protein layer might have had a local pH buffer effect and hindered or reduced the anodic/cathodic cell separation during tribocorrosion . This is a very interesting finding, and the presented method to combine tribocorrosion and spot size XPS analysis might be an interesting path for future studies of tribocorrosion mechanisms in other systems, which should include other proteins and more complex solutions.…”

Section: Resultssupporting

confidence: 81%

“…89−91 Also, as visible from no significant Mo oxide buildup in the wear track (XPS), the protein layer might have had a local pH buffer effect and hindered or reduced the anodic/cathodic cell separation during tribocorrosion. 92 This is a very interesting finding, and the presented method to combine tribocorrosion and spot size XPS analysis might be an interesting path for future studies of tribocorrosion mechanisms in other systems, which should include other proteins and more complex solutions. In fact, another study on CoCrMo in various physiological solutions used a similar approach, 78 however, with no clear trends on Mo enrichment in wear tracks even in the absence of proteins.…”

Section: Metal Release Without Frictionmentioning

confidence: 90%

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Influence of Proteins and Building Direction on the Corrosion and Tribocorrosion of CoCrMo Fabricated by Laser Powder Bed Fusion

Atapour,

Standish,

Henderson

et al. 2024

ACS Biomater. Sci. Eng.

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Cobalt–chromium–molybdenum (CoCrMo) alloys are common wear-exposed biomedical alloys and are manufactured in multiple ways, increasingly using additive manufacturing processes such as laser powder bed fusion (LPBF). Here, we investigate the effect of proteins and the manufacturing process (wrought vs LPBF) and building orientation (LPBF-XY and XZ) on the corrosion, metal release, tribocorrosion, and surface oxide composition by means of electrochemical, mechanical, microscopic, diffractive, and spectroscopic methods. The study was conducted at pH 7.3 in 5 g/L NaCl and 5 mM 2-(N-morpholino) ethanesulfonic acid (MES) buffer, which was found to be necessary to avoid metal phosphate and metal–protein aggregate precipitation. The effect of 10 g/L bovine serum albumin (BSA) and 2.5 g/L fibrinogen (Fbn) was studied. BSA and Fbn strongly enhanced the release of Co, Cr, and Mo and slightly enhanced the corrosion (still in the passive domain) for all CoCrMo alloys and most for LPBF-XZ, followed by LPBF-XY and the wrought CoCrMo. BSA and Fbn, most pronounced when combined, significantly decreased the coefficient of friction due to lubrication, the wear track width and severity of the wear mechanism, and the tribocorrosion for all alloys, with no clear effect of the manufacturing type. The wear track area was significantly more oxidized than the area outside of the wear track. In the reference solution without proteins, a strong Mo oxidation in the wear track surface oxide was indicative of a pH decrease and cell separation of the anodic and cathodic areas. This effect was absent in the presence of the proteins.

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