Corrosion inhibition of metal alloys

Details Corrosion inhibition of metal alloys Corrosion inhibition of metal alloys

1987-01-20

1988-05-10

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148900, 20419231, C23C 1400

Patent

active

047433086

ABSTRACT:
A metal alloy with a treated surface and the process of effecting the treated surface are disclosed whereby its ion release under static, stress and crevice corrosion and corrosive wear conditions is reduced. The metal alloy preferably is an ASTM F-75 Co-Cr-Mo alloy. The preferred process includes providing a workpiece formed of such a metal alloy with a coating of biologically compatible elements, such as a noble metal and then exposing the thus coated surface thereof to bombardment by an ion beam, whereby a plurality of noble metal atoms, together with a plurality of ions from the beam, are driven into the surface of the workpiece a certain distance. Another preferred process includes the direct ion implantation of a workpiece with biocompatible elements, such as nitrogen, tantalum and inert gas ions. Preferably, such a workpiece finds application as an orthopaedic implant.

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patent: 4465524 (1984-08-01), Dearnaley et al.
Sioshansi et al., "Wear Improvement of Surgical Titanium Alloys by Ion Implantation;" J. Vac. Sci. Tech. A3(6), Nov./Dec. 1985; pp. 2670 et seq.
J. M. Williams et al., "Ion Implantation of Surgical Ti-6Al-4V Alloy;" International Conference on Surgical Modification, Heidelberg, Sep. 17-21, 1984.
L. Block et al., "Serum Concentration of Chromium, Cobalt & Nickel after Total Hip Replacement: a 6 mos. study; "Biomaterials, 12/1983, vol. 4, p. 160.
A. Koezel et al., "Release of Corrosive Products by F-75 Cobalt Base Alloy in the Rat. I: Acute Serum Elevations: J. Biomed. Mat. Res. vol. 18, 513-522 (12/1984).
J. L. Woodsman et al., "Isolation of Serum Protein Organometallic Corrosive Products from 316LSSS & HS-21 in vitro & in vivo ; "J. Bio. M. R. vol. 18, 99-114, 12(1984).
W. C. Oliver et al., "The Wear Behavior of Nitrogen-Implanted Metals;" Metallurgical Transactions; ISA, Dec. 1984, 2221-2229.

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