AVS 62nd International Symposium & Exhibition
    Tribology Focus Topic Thursday Sessions
       Session TR-ThP

Paper TR-ThP5
Study of Wear-corrosion Mechanisms of CoCrMo Alloys Alone and Coated with TiAlN Coatings

Thursday, October 22, 2015, 6:00 pm, Room Hall 3

Session: Tribology Poster Session
Presenter: Martin Flores, Universidad de Guadalajara, Mexico
Authors: M. Flores, Universidad de Guadalajara, Mexico
O. Jimenez, Universidad de Guadalajara, Mexico
E. Andrade, Universidad Nacional Autonoma de México
Correspondent: Click to Email
The wear-corrosion 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 to wear and corrosion. The coatings of TiAlN were deposited on CoCrMo alloys by magnetron sputtering. In this work we study the wear mechanism of the samples coated and alone in a simulated body fluid with an ion concentration similar to that in the human blood. 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 coatings was studied in simulated body fluid. The tribocorrosion was performed using a ball on plate reciprocating tribometer, the tests were conducted at 37 °C of temperature. The loads used were between 0.5 N to 2N, the oscillating frequencies was 1Hz. The corrosion and tribocorrosion were studied using open circuit potential (OCP) and potentiodynamic polarizations. In order to study the wear mechanisms, the debris, the topography and composition of worn surfaces were analyzed by means of SEM and Raman spectrocopy. The coatings improve the corrosion and tribocorrosion resistance of CoCrMo alloys and change the wear mechanisms of the substrate.