1. Degradation of biodegradable implants: The influence of microstructure and composition of Mg-Zn-Ca alloys
- Author
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Virginie Roche, Guilherme Yuuki Koga, T.B. Matias, Claudemiro Bolfarini, Walter Jose Botta, C.S. Kiminami, Ricardo P. Nogueira, A.M. Jorge Junior, Electrochimie Interfaciale et Procédés (EIP ), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Science et Ingénierie des Matériaux et Procédés (SIMaP ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Universidade Federal de São Carlos [São Carlos] (UFSCar), and Khalifa University for Science Technology [Abou Dabi]
- Subjects
Materials science ,Hydrogen ,Alloy ,Oxide ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,Corrosion ,chemistry.chemical_compound ,Materials Chemistry ,[CHIM]Chemical Sciences ,ComputingMilieux_MISCELLANEOUS ,Amorphous metal ,Mechanical Engineering ,Metals and Alloys ,021001 nanoscience & nanotechnology ,Microstructure ,Casting ,Grain size ,0104 chemical sciences ,chemistry ,Chemical engineering ,Mechanics of Materials ,engineering ,0210 nano-technology - Abstract
This work reports on the degradation of two (Zn-poor and Zn-rich) Mg-Zn-Ca crystalline alloys produced by mold casting yielding different kinds of microstructures with several scales. The dependence of corrosion properties and hydrogen evolution with alloy compositions, sizes and kinds of microstructure was exhaustively analyzed. The results were compared with amorphous alloys of same compositions. Zn-rich composition with average grain sizes of less than 500 nm presented marginal and an acceptable level of hydrogen, which was lower than for larger grains or Zn-poor composition. This behavior was explained by the reduction of the intrinsic metallic surface reactivity and the higher stability of the oxide film, which reduce the corrosion rate and, consequently, the hydrogen evolution. Mg-Zn-Ca crystalline alloys with Zn-alloying threshold and homogeneous grain size (
- Published
- 2019
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