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Metals 2019, 9(3), 307;

Influence of Boron Addition on the Microstructure and the Corrosion Resistance of CoCrMo Alloy

Facultad de Ingeniería Mecánica y Eléctrica de la Universidad Autónoma de Nuevo León, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza CP 66455, Mexico
Facultad de Ingenierías Fisicoquímicas, Universidad Industrial de Santander (UIS), Carrera 27 Calle 9, Bucaramanga, Colombia
Departamento de Ingeniería, Universidad de Monterrey, Av.Morones Prieto 4500, San Pedro Garza García CP 66238, Mexico
Author to whom correspondence should be addressed.
Received: 15 February 2019 / Revised: 4 March 2019 / Accepted: 6 March 2019 / Published: 8 March 2019
(This article belongs to the Special Issue The Electrochemical and Corrosion Behaviour of Structural Materials)
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Cobalt-based alloys are extensively used in orthopedic applications for joint replacements due to their wear and corrosion resistance. Corrosion, however, is often associated with fatigue failure in these orthopedic devices. In this study, the effect of boron addition on the corrosion behavior of CoCrMo alloys was studied using linear polarization resistance, potentiodynamic polarization curves, electrochemical impedance spectroscopy, and cyclic voltammetry. The samples were analyzed under as-cast and heat treatment conditions after 21 days of immersion in phosphate-buffered saline (PBS) solution at 37 °C. The boron addition increased the particle content, while the heat treatment promoted enlargement and even distribution of the precipitates throughout the structure. The corrosion resistance was improved by both boron and heat treatments. The best performance was observed for a heat-treated alloy having a very small amount of boron, which had an increased resistance to corrosive attack. Such behavior was attributed to the homogenized microstructure achieved by boron and heat treatment that helped to form a stable passive layer of chromium oxide which endured the 21 days of immersion. View Full-Text
Keywords: corrosion resistance; CoCrMo; heat treatment; microstructure; biomaterials corrosion resistance; CoCrMo; heat treatment; microstructure; biomaterials

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Hernandez-Rodriguez, M.A.; Laverde-Cataño, D.A.; Lozano, D.; Martinez-Cazares, G.; Bedolla-Gil, Y. Influence of Boron Addition on the Microstructure and the Corrosion Resistance of CoCrMo Alloy. Metals 2019, 9, 307.

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