Electrochemical dissolution of biomedical grade Ti6Al4V: Influence of stress and environment

Stress dependent electrochemical dissolution is identified as one of the key mechanisms governing surface degradation in fretting and crevice corrosion of biomedical implants. In the current study, material removal on a stressed surface of Ti6Al4V subjected to single asperity contact is investigated to identify the influence of contact load, in-plane stress and environment on wear damage. A range of known stress levels are applied to the specimen while its surface is mechanically stimulated in different non-reactive to oxidizing aqueous environments. Evolution of surface degradation is monitored, and its mechanism is elucidated. Implications to life prediction of orthopedic implants are discussed.