| AVS 60th International Symposium and Exhibition | |
| Tribology Focus Topic | Tuesday Sessions |
| Session TR-TuP |
| Session: | Tribology Poster Session |
| Presenter: | M. Flores, Universidad de Guadalajara, México |
| Authors: | M. Flores, Universidad de Guadalajara, México O. Jimenez, Universidad de Guadalajara, México E. Rodriguez, Universidad de Guadalajara, México C.E. Canto, Universidad Nacional Autónoma de México E. Andrade, Universidad Nacional Autónoma de México |
| Correspondent: | Click to Email |
The tribocorrosion phenomenon is present in biomedical alloys that are used in artificial implants to replace natural joints. This damage limit the service life of such implants, the hard coatings can improve the resistance of wear and corrosion. The multilayers of TiAlN/TiAl were deposited on CoCrMo alloys by magnetron sputtering. The structure of coatings was studied by means of XRD and the composition by RBS and EDS techniques. The tribocorrosion behavior of CoCrMo alloys alone and coated with TiAlN/TiAl multilayers was studied in simulated body fluid. The tribocorrosion was performed using a ball on plate reciprocating tribometer, the test was conducted in a simulated body fluid at 37 °C of temperature. The loads used were between 0.25 N to 2N, the oscillating frequencies was 1Hz. The corrosion and tribocorrosion were studied using open circuit potential (OCP), potentiodynamic polarization, cyclic polarization and potentiostatic polarization measurements. The potentiodynamic polarization was used to estimate the change in the corrosion rate due to wear and the potensiostatic polarization in the passive region to measure the change in the wear rate due to corrosion. In order to study the wear mechanisms, the topography and composition of worn surfaces were analyzed by means of profilometry, SEM and EDS. For the CoCrMo alloy the corrosion augmentation factor was greater than the wear augmentation factor. The coatings improve the corrosion and tribocorrosion resistance of CoCrMo alloys.