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Acta of Bioengineering and Biomechanics

Tytuł artykułu

Structure and corrosion resistance of Co-Cr-Mo alloy used in Birmingham Hip Resurfacing system

Autorzy Dobruchowska, E.  Paziewska, M.  Przybyl, K.  Reszka, K. 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
EN The endoprostheses made of cobalt-chromium-molybdenum (Co-Cr-Mo) alloys belong to the group of the most popular metallic implants used for hip joints reconstruction. For such biomaterials, the primary goal is correct and long-term functioning in the aggressive environment of body fluids. Therefore, the purpose of this study was to examine both the morphology and the corrosion resistance of implants made of the cobalt alloy used in Birmingham Hip Resurfacing (BHR) system (Smith & Nephew). For comparative purposes, the electrochemical studies were done for the nitrided stainless steel – Orthinox. Methods: Observations of the microstructure of the investigated material were performed by means of the optical metallographic microscope and the scanning electron microscope. Furthermore, Energy Dispersive X-ray Spectroscopy was used to analyse the chemical composition of the endoprosthesis. Characterisation and evaluation of electrochemical corrosion resistance of the selected alloys were performed by potentiodynamic polarisation tests. Results: The structural studies confirmed that Co-Cr-Mo (BHR system) is characterised by a typical dendritic microstructure with carbide precipitates, mainly M23C6, within the interdendritic areas. Results of the polarisation measurements showed that the investigated cobalt alloy exhibits lower corrosion potential than Orthinox in the utilised environments (3% NaCl, simulated body fluid – Hank’s Body Fluid). Conclusions: However, the high passivation ability of the Co-Cr-Mo alloy, as well as its resistance to the initiation and propagation of localised corrosion processes, indicate that this material is significantly more appropriate for long-term implants.
Słowa kluczowe
PL stopy kobaltu   stopy chromu   stopy molibdenu   karbid   odporność korozyjna   polaryzacja potencjodynamiczna   stal nierdzewna   stal azotowana  
EN cobalt-chromium-molybdenum alloy   Birmingham Hip Resurfacing   carbide   precipitation   corrosion resistance   potentiodynamic polarisation   nitrided stainless steel  
Wydawca Oficyna Wydawnicza Politechniki Wrocławskiej
Czasopismo Acta of Bioengineering and Biomechanics
Rocznik 2017
Tom Vol. 19, nr 2
Strony 31--39
Opis fizyczny Bibliogr. 25 poz., rys., tab., wykr.
autor Dobruchowska, E.
autor Paziewska, M.
  • Koszalin University of Technology, Faculty of Technology and Education
autor Przybyl, K.
  • Koszalin University of Technology, Faculty of Technology and Education
autor Reszka, K.
  • Koszalin University of Technology, Faculty of Technology and Education
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Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).
Kolekcja BazTech
Identyfikator YADDA bwmeta1.element.baztech-1680f55c-b791-4cf5-aacb-8dc41672b0cd
DOI 10.5277/ABB-00510-2015-04