Abstract
The paper presents the results of in vitro studies of fretting and fretting corrosion processes of Ti6Al4V implant alloy in the environment of natural saliva and self-made mucin-based artificial saliva solutions. The study was performed on a specially designed fretting pin-on-disc tester, which was combined with a set used for electrochemical research. The open circuit potential measurements and potentiodynamic method were used for corrosion tests. The worn surfaces were subjected to microscopic observations and an evaluation of wear. Results were interpreted using the dissipated energy and third-body approaches. The X-ray diffraction analysis showed that titanium oxides constitute over 80% of the friction products. Special attention was paid to the role of saliva and its substitutes, which in certain cases can lead to the intensification of fretting wear. On the basis of the received results, a new phenomenological model of fretting corrosion processes was proposed. This model involves the formation of an abrasive paste that is a combination of metal oxides and the organic components of saliva.
Highlights
Titanium and its alloys are materials that are frequently used in alloplasty as well as in dental prosthetics and surgery
The main aim of this work is to present a suggestion for an explanation of the fretting wear mechanism for Ti-Al-V titanium alloy in the environment of saliva and its substitutes
It may related to theoffact under cases, high pressure, wear products aredecrease crushed as unit loads increase
Summary
Titanium and its alloys are materials that are frequently used in alloplasty as well as in dental prosthetics and surgery. Titanium can be used in commercially pure form (Cp, Ti) as well as in alloy form. Alloy in bi-phase form (α and β) with the addition of aluminum and vanadium has been most commonly used for medical applications for many years [3]. Due to the toxicity of vanadium, which causes osteolysis, inflammatory states as well as carcinogenic changes [4], new alloy compositions (Ti-6Al-7Nb, Ti-6Al-(3–6)Nb-(1–6)Ta, Ti-5Al-2.5Fe, Ti-12Mo-5Zr-3Al) with better biocompatibility are being created. Additives of Mo, Ta, and Nb stabilize the β-phase and improve their fatigue strength, corrosion resistance, and elastic modulus, which should be similar to the elastic modulus of human bone [5,6]
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