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Corrosion behavior of tantalum-coated cobalt-chromium modular necks compared to titanium modular necks in a simulator test.

The Journal of arthroplasty (2013-10-09)
Ulrich Dorn, Daniel Neumann, Mario Frank
ABSTRACT

This study compared the corrosion behavior of tantalum-coated cobalt-chromium modular necks with that of titanium alloy modular necks at their junction to titanium-alloy femoral stem. Tests were performed in a dry assembly and two wet assemblies, one contaminated with calf serum and the other contaminated with calf serum and bone particles. Whereas the titanium modular neck tested in the dry assembly showed no signs of corrosion, the titanium modular necks tested in both wet assemblies showed marked depositions and corrosive attacks. By contrast, the tantalum-coated cobalt-chromium modular necks showed no traces of corrosion or chemical attack in any of the three assemblies. This study confirms the protective effect of tantalum coating the taper region of cobalt-chromium modular neck components, suggesting that the use of tantalum may reduce the risk of implant failure due to corrosion.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Tantalum, foil, thickness 0.025 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Tantalum, powder, −325 mesh, 99.9% trace metals basis
Sigma-Aldrich
Tantalum, foil, thickness 0.05 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Tantalum, powder, 60-100 mesh, 99.9%
Sigma-Aldrich
Tantalum, foil, thickness 0.25 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Tantalum, powder, 99.99% trace metals basis
Sigma-Aldrich
Tantalum, nanopowder, <25 nm particle size (BET), ≥99% trace metals basis
Sigma-Aldrich
Tantalum, wire, diam. 1.0 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Tantalum, wire, diam. 0.5 mm, ≥99.9% trace metals basis
Tantalum, wire reel, 5m, diameter 1.0mm, annealed, 99.9%
Tantalum, wire reel, 5m, diameter 0.40mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.05mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.075mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.100mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.125mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.15mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.20mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.25mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.25mm, annealed, 99.99%
Tantalum, foil, 10mm disks, thickness 0.5mm, annealed, 99.9%
Tantalum, foil, 10mm disks, thickness 0.75mm, annealed, 99.9%
Tantalum, foil, 15mm disks, thickness 0.006mm, 99.9%
Tantalum, foil, 15mm disks, thickness 0.0075mm, 99.9%
Tantalum, foil, 15mm disks, thickness 0.009mm, 99.9%
Tantalum, foil, 15mm disks, thickness 0.0125mm, 99.9%
Tantalum, foil, 15mm disks, thickness 0.015mm, 99.9%
Tantalum, foil, 15mm disks, thickness 0.01mm, 99.9%
Tantalum, foil, 15mm disks, thickness 0.025mm, as rolled, 99.9%
Tantalum, foil, 15mm disks, thickness 0.02mm, 99.9%
Tantalum, foil, 15mm disks, thickness 0.034mm, as rolled, 99.9%

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