Microabrasion-corrosion of cast CoCrMo alloy in simulated body fluids

D. Sun*, J. A. Wharton, R. J. K. Wood, L. Ma, W. M. Rainforth

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

Wear and corrosion of metal-on-metal hip replacements results in wear debris and metal-ion release in vivo, which may subsequently cause pain and hypersensitivity for patients. Retrieved metal-on-metal hip replacements have revealed that two-body sliding wear and three-body abrasive wear are the predominant wear mechanisms. However, there is a lack of understanding of the combined effects of wear/corrosion, especially the effect of abrasion-corrosion.

This study investigates the sliding-corrosion and abrasion-corrosion performance of a cast CoCrMo alloy in simulated hip joint environments using a microabrasion rig integrated with an electrochemical cell. Tests have been conducted in 0.9% NaCl, phosphate buffered saline solution, 25% and 50% bovine serum solutions with 0 or 1 g cm(-3) SiC at 37 degrees C. Experimental results reveal that under abrasion-corrosion test conditions, the presence of proteins increased the total specific wear rate. Conversely, electrochemical noise measurements indicated that the average anodic current levels were appreciably lower for the proteinaceous solutions when compared with the inorganic solutions. A severely deformed nanocrystalline layer was identified immediately below the worn surface for both proteinaceous and inorganic solutions. The layer is formed by a recrystallisation process and/or a strain-induced phase transformation that occurs during microabrasion-corrosion. (C) 2008 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)99-110
Number of pages12
JournalTribology International
Volume42
Issue number1
DOIs
Publication statusPublished - Jan 2009
Event34th Leeds-Lyon Symposium on Tribology - Lyon, France
Duration: 04 Sep 200707 Sep 2007

Keywords

  • CoCrMo alloy
  • Microabrasion-corrosion
  • Electrochemical noise
  • HIP-JOINT BEARINGS
  • ORTHOPEDIC IMPLANTS
  • WEAR PROPERTIES
  • BOVINE SERUM
  • IN-VITRO
  • METAL
  • ADSORPTION
  • PHOSPHATE
  • BEHAVIOR
  • SURFACE

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