Tribocorrosion behavior of hot pressed CoCrMo alloys in artificial saliva

• Published in: Tribology international Vol. 97; no. C; pp. 423 - 430
• Main Authors: Buciumeanu, M., Bagheri, A., Souza, J.C.M., Silva, F.S., Henriques, B.
• Format: Journal Article
• Language: English
• Published: United Kingdom Elsevier Ltd 01-05-2016; Elsevier
• Subjects: Alloys; Biomedical applications; CoCrMo alloy; Hot pressing; Open circuit potential; Saliva; Strokes; Tribocorrosion; Tribology; Wear rate; Hot pressing; Tribocorrosion; Biomedical applications; CoCrMo alloy
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2016.02.007

The aim of this work was to investigate the influence of the processing conditions on the tribocorrosion behavior of hot pressed CoCrMo biomedical alloys. Several samples were processed as a function of different processing temperatures (900, 1000 and 1100°C) and times (10, 30 and 60min). Tribocorrosion tests were carried out in artificial saliva at 37°C, under 1N normal load, 1Hz frequency and 3mm stroke length. Open circuit potential was measured. The worn surfaces were inspected by means of SEM/EDS. Results revealed a decrease of wear rate with increasing hot pressing time. The samples hot pressed at 1000°C revealed the lowest wear rate. These findings showed that the processing conditions play a relevant role on tribocorrosion behavior of CoCrMo.
•The wear properties were affected by the hot pressing processing conditions.•The different hot pressing times showed a higher influence on the wear rates.•At 900°C samples presented low porosity, low hardness and high wear rates.•Lower degradation under tribocorrosion was obtained for HP1000 samples and 30min.•The wear properties were affected by the synergistic effect from wear and corrosion.