Tribocorrosion behavior of hot pressed CoCrMo alloys in artificial saliva

• 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 30 min.
• The wear properties were affected by the synergistic effect from wear and corrosion.

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 60 min). Tribocorrosion tests were carried out in artificial saliva at 37 °C, under 1 N normal load, 1 Hz frequency and 3 mm 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.