Tribocorrosion of Pulsed Plasma-Nitrided CoCrMo Implant Alloy

Bazzoni, A.; Mischler, S.; Espallargаs, N.

doi:10.1007/s11249-012-0047-0

Cited by 49 publications

(27 citation statements)

References 21 publications

(44 reference statements)

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“…(9) this results in an increase of wear accelerated corrosion and thus of wear, an effect indeed observed in practice [2]. As another example, non passive alloys (passivation charge q¼0) should perform better under tribocorrosion conditions, as evidenced by the improved tribocorrosion behaviour of nitrided CoCrMo alloys reported by Bazzoni et al [85].…”

Section: Wear Accelerated Corrosionmentioning

confidence: 84%

“…4 (0-0.3 V corresponds well with the threshold potential of 0.15 V [84] at which passive film thickening accelerates significantly. Recently, Espallargas et al [85] investigated the corrosion and tribocorrosion behaviour of a pulse plasma nitrided biomedical CoCrMo alloy. They observed that CoCrMo samples containing nitrogen in solid solution exhibit neither a passive behaviour nor a potential dependent transition to high wear.…”

Section: Effect Of Potential On Wearmentioning

confidence: 99%

See 1 more Smart Citation

Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal

Mischler

Muñoz

2013

Wear

175

116

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a b s t r a c tA good biocompatibility, excellent mechanical properties and high corrosion resistance characterize CoCrMo alloys. Therefore they are widely used for artificial joints in biomedical implants. However, the degradation of the implants during service life leads to the release into the body of toxic ions and wear particles. This continuous degradation is of concern for long-term stability of the implants. Published literature has highlighted the relevance of lubrication as well as metallurgical and contact mechanical factors on the degradation of CoCrMo implant alloys. Recent experimental investigations have proposed tribocorrosion, i.e., the interplay of mechanical wear and corrosion by the body fluids, as one of the crucial degradation mechanism of implants. Tribocorrosion is sub-discipline of tribology and corrosion that recently made significant progresses in mechanistic understanding and modelling. The present work aims at evaluating published results on the degradation of CoCrMo alloys using existing tribocorrosion concepts. Results show that wear accelerated corrosion due to mechanical removal of the passive film during sliding is a major contribution to the overall degradation. Further, a transition from low (10 À 6 N/mm 3 m) to high (10 À 4 N/mm 3 m) wear coefficients was found at a threshold electrode potential close to 0.2 V SHE These findings clearly show that electrochemical phenomena play a key role on the tribological behaviour of biomedical CoCrMo alloy implants.

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Section: Wear Accelerated Corrosionmentioning

confidence: 84%

Section: Effect Of Potential On Wearmentioning

confidence: 99%

Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal

Mischler

Muñoz

2013

Wear

175

116

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“…The cell was equipped with a saturated calomel reference electrode, a graphite auxiliary electrode and a holder leaving only the one side of the specimen exposed to the corroding medium. In all cases the electrolyte volume was 800 ml and the sample surface which was in contact with the testing solution 1 cm 2 . The open circuit potential or corrosion potential E corr was recorded after 30 min stabilization whereas rapid (50 V/ h) and slow scan rates (0.6 V/h) were used.…”

Section: Corrosion Testsmentioning

confidence: 99%

“…However, their wear and corrosion stability are of great concern during the last years [1][2][3]. Literature studies showed that the released of metal ions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Use of combination of accelerator-based ion-beam analysis techniques to the investigation of the corrosion behavior of CoCrMo alloy

Noli

Μisaelides

Lagoyannis

et al. 2014

Nuclear Instruments and Methods in Physics Research Section B:

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a b s t r a c tNuclear Reaction Analysis -NRA in combination with d-RBS (E d : 1.35 MeV) was applied in order to investigate the corrosion behavior of CoCrMo alloy. The corrosion resistance of the alloy was compared to that of modified CoCrMo samples by several techniques as plasma nitriding and oxidizing at moderate temperature ($400°C). Electrochemical techniques in simulated body fluid 0.9% NaCl (37°C) were applied in order to accelerate the corrosion process. The nitrogen depth distribution before and after the corrosion was determined using the 14 N(d,a) 12 C and the 14 N(d,p) 15 N nuclear reactions whereas the oxygen by the 16 O(d,p) 17 O. The surface morphology and microstructure was investigated using microscopy techniques.It was found that surface treatments produce thick nitrided layers (5-6 lm) consisting of a supersaturated nitrogen solution (nitrogen concentration is $30 at.%) in the matrix (expanded phase c N ) and a thin oxygen solution (0.3 lm). The samples subjected to plasma nitridation and oxidation exhibited the lowest deterioration and better resistance to corrosion compared to the single nitrided or single oxidized and the untreated material. This could be attributed to the modified surface region with the high nitrogen content and the presence of oxygen.

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“…Efforts have also been made in recent years to improve the tribological, corrosion, and tribocorrosion properties of biomedical alloys by surface engineering, mainly by applying an innovative surface coating [14][15][16] and by surface alloying [17][18][19]. In particular, the potential of S-phase coating and CrN coating to improve tribocorrosion behavior of biomedical alloys has been studied in details [20,21].…”

Section: Introductionmentioning

confidence: 99%

Tribocorrosion Behavior of Duplex S/Cr(N) and S/Cr(C) Coatings on CoCrMo Alloy in 0.89 % NaCl Solution

Sun

Dearnley

2014

J Bio Tribo Corros

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In the present study, magnetron sputtering was used to deposit two types of duplex coatings, S/Cr(N) and S/Cr(C), onto ASTM F75 CoCrMo cast alloy, aiming at improving the tribocorrosion behavior of the medical alloy. The duplex coatings were fabricated and structured such that the inner layer comprised carbon S phase with a CoCrMo matrix by sputtering a CoCrMo alloy target in the presence of carbon containing atmosphere. The duplex coatings were found to be elastically compatible with the CoCrMo alloy, and possess higher hardness and a larger hardness-to-modulus ratio than the uncoated alloy. Tribocorrosion tests were conducted in 0.89 % NaCl solution at 37°C under elastic contact and unidirectional sliding conditions. The results showed that the duplex S/Cr(N) coating was very effective in improving the tribocorrosion behavior of the alloy at all applied potentials, in terms of reduced friction and much improved resistance to total material loss (TML) by up to more than one order of magnitude. On the other hand, the duplex S/Cr(C) coating was effective only at open circuit and anodic potentials (APs), but not at cathodic potentials. The uncoated alloy exhibited low friction and low TML at a large cathodic potential and experienced peculiar frictional behavior at the tested AP. The results are discussed in terms of material transfer, hydrogen charging, third body effects, and synergism between wear and corrosion.

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Tribocorrosion of Pulsed Plasma-Nitrided CoCrMo Implant Alloy

Cited by 49 publications

References 21 publications

Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal

Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal

Use of combination of accelerator-based ion-beam analysis techniques to the investigation of the corrosion behavior of CoCrMo alloy

Tribocorrosion Behavior of Duplex S/Cr(N) and S/Cr(C) Coatings on CoCrMo Alloy in 0.89 % NaCl Solution

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