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

Marco Hernandez-Rodriguez, Dionisio Laverde-Cataño, Diego Lozano, Gabriela Martinez-Cazares, Yaneth Bedolla-Gil

Research output: Contribution to journalArticle

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Abstract

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.
Original languageEnglish
Article number307
JournalMetals
Volume9
Issue number3
DOIs
Publication statusPublished - 1 Mar 2019

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Boron
Corrosion resistance
Microstructure
Heat treatment
Orthopedics
Corrosion
Caustics
Potentiodynamic polarization
Cobalt
Electrochemical impedance spectroscopy
Sodium Chloride
Cyclic voltammetry
Wear resistance
Precipitates
Chromium
Phosphates
Fatigue of materials
Polarization
Oxides

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

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abstract = "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.",
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Influence of Boron Addition on the Microstructure and the Corrosion Resistance of CoCrMo Alloy. / Hernandez-Rodriguez, Marco; Laverde-Cataño, Dionisio; Lozano, Diego; Martinez-Cazares, Gabriela; Bedolla-Gil, Yaneth.

In: Metals, Vol. 9, No. 3, 307, 01.03.2019.

Research output: Contribution to journalArticle

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AU - Laverde-Cataño, Dionisio

AU - Lozano, Diego

AU - Martinez-Cazares, Gabriela

AU - Bedolla-Gil, Yaneth

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AB - 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.

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