Title: The Effect of Surface Treatments on the Fretting Behaviour of Ti-6Al-4V Alloy
Authors: SCHAAFF PetraHOLZWARTH UWECHIESA R.RONDELLI GDALMIGLIO M.
Citation: JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS vol. 86B no. 2 p. 407-416
Publisher: WILEY-LISS
Publication Year: 2008
JRC N°: JRC38096
ISSN: 1552-4973
URI: http://www3.interscience.wiley.com/cgi-bin/fulltext/117873647/PDFSTART
http://publications.jrc.ec.europa.eu/repository/handle/JRC38096
DOI: 10.1002/jbm.b.31034
Type: Articles in periodicals and books
Abstract: Stem modularity in total hip replacement introduces an additional taper joint between Ti-6Al-4V stem components with the potential for fretting corrosion processes. One possible way to reduce the susceptibility of the Ti-6Al-4V / Ti-6Al-4V interface to fretting is the surface modification of the Ti-6Al-4V alloy. Among the tested, industrially available surface treatments, a combination of two deep anodic spark deposition treatments followed by barrel polishing resulted in a four times lower material release with respect to untreated, machined fretting pad surfaces. The fretting release has been quantified by means of radiotracers introduced in the alloy surface by proton irradiation. In a simple sphere on flat geometry, the semispherical fretting pads were pressed against flat, dog-bone shaped Ti-6Al-4V fatigue samples cyclically loaded at 4 Hz. In this way a cyclic displacement amplitude along the surfaces of 20 μm has been achieved. A further simplification consisted in the use of deionized water as lubricant. A comparison of the radiotracer results with an electrochemical material characterization after selected treatments by potentiostatic tests of modular stems in 0.9% NaCl at 40°C for ten days confirmed the benefit of deep anodic spark deposition and subsequent barrel polishing for improving the fretting behaviour of Ti-6Al-4V.
JRC Directorate:Institute for Health and Consumer Protection Historical Collection

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