Corrosion behavior of a low modulus β-Ti-45%Nb alloy for use in medical implants.pdf

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Corrosion behavior of a low modulus β-Ti-45%Nb alloy for use in medical implants.pdf

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Corrosion behavior of a low modulus β-Ti-45%Nb alloy for use in medical implants

J O U R N A L O F M A T E R I A L S S C I E N C E : M A T E R I A L S I N M E D I C I N E 1 7 (2 0 0 6 ) 63 – 67 Corrosion behavior of a low modulus β-Ti-45%Nb alloy for use in medical implants R. GODLEY, D. STAROSVETSKY?, I . GOTMAN Faculty of Materials Engineering, Technion-IIT, Haifa 32000, Israel E-mail: davstar@tx.technion.ac.il The corrosion and electrochemical behavior of a low stiffness β-Ti-45wt.%Nb (Ti45Nb) was studied in solutions that resemble body environment, as compared to Ti6Al4V and Ti-55wt.%Ni (Ti55Ni, Nitinol) alloys currently used in surgical implants. In Ringers’ solution, Ti45Nb alloy exhibited an excellent corrosion resistance, comparable to that of Ti6Al4V and much better than that of Nitinol. In acidic environments, β-Ti45Nb remained passive under conditions where active dissolution was observed for both Ti6Al4V and Nitinol alloys. The results warrant further corrosion and biocompatibility studies of β-Ti45Nb alloy to establish its suitability as implant material. C? 2006 Springer Science + Business Media, Inc. 1. Introduction β-Ti-45 wt.% Nb (Ti45Nb) alloy is a promising material for use in medical implants. An important requirement of implants designed to replace or interact with bone is a low elastic modulus matching as closely as possible that of the surrounding bone tissue [1, 2]. Bone is normally subject to stresses and strains resulting from weight bearing and movement that determine its structural or- ganization during life. When a stiff surgical device is placed in the bone vicinity, it carries a considerable part of the load thus shielding the bone from the physiolog- ical ’stressing’ required to maintain its density, strength and healthy structure. Such ’stress shielding’ results in bone resorption and eventually leads to the loosening and premature failure of the implant. To prevent this undesirable phenomenon, the Young’s modulus of the implant material should be as close as possible to that of the bone. Titanium and Ti6Al4V α-β