STP796

    Surface Preparation and Corrosion Behavior of Titanium Alloys for Surgical Implants

    Published: Jan 1983


      Format Pages Price  
    PDF (336K) 14 $25   ADD TO CART
    Complete Source PDF (7.5M) 14 $87   ADD TO CART


    Abstract

    Surface preparation and corrosion behavior of titanium alloys were studied; both topics deal with the formation of surface oxide films. When metals are prepared for surgical implant use, an effort is made to produce an optimum surface. Effects of the surface treatments on surface morphology, surface film composition, and structure are shown in transmission electron photomicrographs and electron diffraction patterns. Roughened surfaces were produced, and surface films of titanium oxide (TiO) or titanium dioxide (TiO2) or both occurred on some specimens. Sodium titanate (NaO · xTiO2) occurred on the specimens washed in sodium hydroxide (NaOH) solution.

    Open circuit potential versus time curves have been measured to show some electrochemical effects of various surface treatments. The results show that titanium alloys immersed in Hanks' physiological solution reach the same final open-circuit potential after approximately two weeks' exposure regardless of prior surface treatment. Measurements of the anodic polarization behavior of titanium alloys and other surgical implant alloys show the effects of alloy composition and the testing solution on the passive region and breakdown potentials of these materials. In general, for titanium alloys, the differences are not great, but the presence of nickel results in a significant lowering of the breakdown potential. The materials studied were titanium, Ti-6Al-4V, titanium-nickel (memory alloy), Ti-13Cu-4Ni, and Ti-4.5Al-5Mo-1.5Cr. In all cases titanium materials are more corrosion resistant in Hanks' solution than cobalt-chromium-molybdenum Type 316L stainless steel, or cobalt-nickel-chromium alloys. Repassivation measurements show the rapid formation and the high degree of stability of the protective film on titanium and titanium alloys.

    Keywords:

    titanium, titanium alloys, corrosion, surface films, surface preparation, metal surgical implants, implant materials


    Author Information:

    Fraker, AC
    Metallurgist, group leader, and chemist, National Bureau of Standards, Washington, D.C.,

    Ruff, AW
    Metallurgist, group leader, and chemist, National Bureau of Standards, Washington, D.C.,

    Sung, P
    Branch chief, Food and Drug Administration, Silver Spring, Md.

    Van Orden, AC
    Metallurgist, group leader, and chemist, National Bureau of Standards, Washington, D.C.,

    Speck, KM
    Student, Unifomed Services University Medical School, Bethesda, Md.


    Paper ID: STP28944S

    Committee/Subcommittee: F04.93

    DOI: 10.1520/STP28944S


    CrossRef ASTM International is a member of CrossRef.