AVS 61st International Symposium & Exhibition
    Tribology Focus Topic Thursday Sessions
       Session TR-ThP

Paper TR-ThP4
The Corrosion-Wear Mechanisms of CoCrMo Alloys Coated with TiAlN/TiAl Multilayer

Thursday, November 13, 2014, 6:00 pm, Room Hall D

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. Rodriguez, Universidad de Guadalajara, Mexico
E. Andtade, Universidad Nacional Autonoma de Mexico
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The tribocorrosion phenomenon is present in biomedical alloys that are used in artificial implants to replace natural joints. This damage limits the service life of such implants, the hard coatings can improve the resistance to wear and corrosion. The multilayers of TiAlN/TiAl were deposited on CoCrMo alloys by magnetron sputtering. In this work we study the wear mechanism of the coated alloy and without multilayer 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/TiAl multilayers was studied in simulated body fluid and distilled water. The tribocorrosion was performed using a tribometer with an geometry of ball on plate and reciprocating movement. The tests were conducted at 36 ± 1 °C of temperature. The loads used were 1N, 1.5, and 2N, the oscillating frequencies was 1Hz. The corrosion and tribocorrosion were studied using open circuit potential (OCP) in wear-corrosion tests and potentiodynamic polarizations in corrosion tests. In order to study the wear mechanisms, the topography and composition of worn surfaces were analyzed by means of SEM, EDS and profilometry. In the case of CoCrMo alloy it was found a transition from smooth wear to abrasive wear when the load was increased.