Microstructure and corrosion behaviour in biological environments of the new forged low-Ni Co?Cr?Mo alloys

Hiromoto, Sachiko; Onodera, Emi; Chiba, Akihiko; Asami, K.; Hanawa, Takao

doi:10.1016/j.biomaterials.2005.01.028

Cited by 128 publications

(71 citation statements)

References 19 publications

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“…Decreasing Ni content in these alloys will be necessary to decrease Ni ion elution and improve the safety of CoCrMo alloys. 31) The mass ratios of Co/Cr and Co/Mn for eluted ions from the 1Si1Mn3Ni0N alloy pin into Kokubo solution were 53.1 and 225.0, which were much higher than the same mass ratios in the alloy content, 2.1 and 49.3, respectively. This means that the Cr and Mn ion content in Kokubo solution is lower than expected, based on the chemical composition of the alloy.…”

Section: Elution Of Each Metallic Ionmentioning

confidence: 99%

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

et al. 2013

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Pin-on-disk wear tests using biomedical CoCrMo alloy pins and alumina disks were conducted in Kokubo and 1% lactic acid solutions. The mass loss and elution of metallic ions were measured and the surface of the pin was observed after the wear test. Mass loss of the alloy pins in 1% lactic acid solution was 10 times higher than the mass loss in Kokubo solution. In Kokubo solution, the as-cast pins exhibited higher mass loss and higher total amount of eluted ions than solution-treated pins. The Cr and Mn ion content in Kokubo solution was lower than expected, based on the chemical composition of the alloy. The incorporation of Cr and Mn ions into the calcium phosphate detected on the wear track of disks is the possible reason for the small amount of these ions in Kokubo solution.

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Section: Elution Of Each Metallic Ionmentioning

confidence: 99%

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

et al. 2013

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“…24) Thus, it is likely that dissolved oxygen content has an influence on the formation rate of the surface oxide layers. If the surface oxide layers appear between the pin and the disc, they weaken the adhesion of the wear debris.…”

Section: Discussionmentioning

confidence: 99%

Effect of Dissolved Oxygen Content on Pin-on-Disc Wear Behavior of Biomedical Co-Cr-Mo Alloys in a Like-on-Like Configuration in Distilled Water

2007

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The wear behavior of a forged Co-29Cr-6Mo alloy without any Ni and C added has been investigated by using a tribosystem consisting of a pin-on-disc type wear testing machine in distilled water containing different dissolved oxygen content. Dissolved oxygen content in the distilled water was controlled by aerating with oxygen or by deaerating with argon. Wear volume in the distilled water containing high oxygen content is approximately two times larger than in that containing low oxygen content. Accordingly, it is deduced that the overall wear volume is significantly affected by the dissolved oxygen content in the distilled water surrounding the tribosystem. Although abrasive wear, caused by wear debris, is operative as a wear mechanism in the present tribosystem irrespective of oxygen content, the transfer of the wear debris to sliding surfaces, as well as the aggregation of the wear debris on the sliding surfaces, is more prone to occur during the wear process with the lower oxygen content. Therefore, in the present tribosystem with the lower oxygen content, since the transfer of the wear debris to the disc or the pin readily occurs, the generation of the wear debris does not directly contribute to the wear volume, leading to the apparently lower wear volume in the tribosystem with lower oxygen content than in that with higher oxygen content; the transfer of the wear debris is not counted as wear loss because the wear volume is estimated based on the loss in disc and pin weight that occurs during the wear test.

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“…The protein in solution acted as a cathodic inhibitor by reducing the cathodic reaction rate, and it may affect the mass transport conditions to reduce the accessibility of the surface for oxygen. 15,20,21) During wear testing, the passive lm was broken by the wear damage, and ion elution occurred at the bare surface, resulting in complicated ion elution phenomena. In addition, increasing the surface area by the formation of wear debris also affects the ion elution behavior.…”

Section: Elution Of Metallic Ionsmentioning

confidence: 99%

“…Since the albumin reduces the accessibility of the surface for oxygen and suppresses the formation of a passivation lm, 15,20,21) it is believed that the amount of Cr ions in the solution with albumin was higher than in the solution without albumin.…”

Section: Elution Of Metallic Ionsmentioning

confidence: 99%

Effects of Precipitates and Albumin in Simulated Body Fluids on Pin-on-Disk Wear Behavior of Biomedical Co-Cr-Mo Alloys

et al. 2016

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Pin-on-disk wear tests using Co-Cr-Mo (CCM) alloy pins and disks were conducted in 0.14 M NaCl solutions with and without albumin. To clarify the effect of precipitates in the CCM alloys on the alloy wear behavior, as-received (having precipitates) and solution-treated (having no precipitates) CCM alloys were used as specimens. Friction coef cients during wear testing were measured. After the wear testing, the mass loss of pins and disks, wear tracks on the disks, and the wear debris were examined using scanning electron microscopy (SEM) and laser microscopy (LM). The concentration of metallic ions in solution was analyzed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). In the solution without albumin, the friction coef cient increased with increasing sliding time and discontinuous wear grooves with attached and detached sections were observed, indicating that adhesive wear was dominant. On the other hand, in the solution with albumin, the friction coef cient was constant independent of the sliding distance and continuous wear grooves were observed, indicating that abrasive wear was dominant. High amounts of mass loss were detected from the as-received alloys in the albumin solution, and it is theorized that the wear debris (including precipitates) enhanced the third-body wear. The concentration of Cr ions in solution was lower than the expected values based on the alloy composition. In the solution with albumin, it was thought that the Cr ions bonded with the albumin, increasing the amount of available Cr ions in solution.

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Microstructure and corrosion behaviour in biological environments of the new forged low-Ni Co?Cr?Mo alloys

Cited by 128 publications

References 19 publications

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

Effect of Dissolved Oxygen Content on Pin-on-Disc Wear Behavior of Biomedical Co-Cr-Mo Alloys in a Like-on-Like Configuration in Distilled Water

Effects of Precipitates and Albumin in Simulated Body Fluids on Pin-on-Disk Wear Behavior of Biomedical Co-Cr-Mo Alloys

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Microstructure and corrosion behaviour in biological environments of the new forged low-Ni Co?Cr?Mo alloys

Cited by 128 publications

References 19 publications

Mass Loss and Ion Elution of Biomedical Co&ndash;Cr&ndash;Mo Alloys during Pin-on-Disk Wear Tests

Mass Loss and Ion Elution of Biomedical Co&ndash;Cr&ndash;Mo Alloys during Pin-on-Disk Wear Tests

Effect of Dissolved Oxygen Content on Pin-on-Disc Wear Behavior of Biomedical Co-Cr-Mo Alloys in a Like-on-Like Configuration in Distilled Water

Effects of Precipitates and Albumin in Simulated Body Fluids on Pin-on-Disk Wear Behavior of Biomedical Co-Cr-Mo Alloys

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Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests