Fretting Corrosion Behavior of Additive Manufactured and Cryogenic‐Machined Ti6Al4V for Biomedical Applications

Abstract

Metal ion release, caused by synergistic effect of wear and corrosion, is one of the major concerns related to the prostheses lifetime. In this work, samples of additive manufactured Ti6Al4V are machined under dry cutting and cryogenic cooling conditions and their performances in terms of corrosion and fretting corrosion response are investigated. A wet and temperature-controlled apparatus equipped with an electro-chemical cell is designed and set-up in order to evaluate the fretting corrosion effect acting at the interfaces. The obtained results show that the cryogenic machining improves the corrosion and fretting corrosion behavior of the investigated additive manufactured Ti6Al4V

Machining of biocompatible materials — Recent advances

“…33 [12,59]. For surface generation, conventional milling and drilling are commonly used in the production lines for polymer-composite machining [91,120], which, however, could introduce severe subsurface damage and high cutting forces [16,92,120]. An effective way to minimise these effects is to employ abrasive machining, e.g.…”

“…60). Bruschi and co-workers reported in several investigations on the impact of machining parameters and cooling strategies on the wear behaviour [23,24] and tribocorrosion performance [16,17] of wrought and additive manufactured Ti6Al4V alloys for biomedical applications. Wear tests were performed using a cylinder-on-plate configuration in a wet and temperaturecontrolled saline environment (Fig.…”

“…Bertolini et al [16] reported on the effect of the cutting parameters and cooling strategies on the fretting corrosion behaviour of the EBM Ti6Al4V alloy under conditions replicating the taper interfaces of a modular hip junction. They indicated that cryogenic machining was the most effective cutting strategy that could enhance the mechanical, chemical, and tribological behaviour of the machined surfaces.…”

Mechanical properties and microstructure of a Ti-6Al-4V alloy subjected to cold rolling, asymmetric rolling and asymmetric cryorolling

“…Eqs. (1)- (5) suggest that dislocation density during deformation increases with higher shear strain and lower temperature. Consistent with this prediction, the apparent dislocation cell density in Ti-6Al-4V alloy subjected to asymmetric cryorolling was observed to be higher than that resulting from asymmetric rolling, and it is lowest in the alloy subjected to cold rolling with the same rolling reduction.…”

Study of Al–SiO2 Aesthetic Composite Coating on Orthodontic Metal Archwire

“…After plasma electrolytic oxidation, the tribocorrosion performance was markedly improved, indicating that the addition of the coating to the alloy surface can obviously improve the material properties. Rachele et al [10] examined that wear and corrosion-caused metal ion release shortens the lifespan of a prosthesis. Cryogenic machining weakens the corrosion and fretting corrosion performance of the additive Ti6Al4V.…”