Mass loss and ion elution of biomedical Co-Cr-Mo alloys during pin-on-disk wear tests

Kyosuke Ueda, Kaori Nakaie, Shigenobu Namba, Takashi Yoneda, Keita Ishimizu, Takayuki Narushima

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Pin-on-disk wear tests using biomedical Co-Cr-Mo 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.

Original languageEnglish
Pages (from-to)1281-1287
Number of pages7
JournalMaterials Transactions
Issue number8
Publication statusPublished - 2013


  • Cobalt-chromium-molybdenum alloy
  • Ion elution
  • Kokubo solution
  • Lactic acid solution
  • Pin-on-disk wear test
  • Precipitate

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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