Influence of ultra-fine grain structure on corrosion behaviour of biodegradable Mg-1Ca alloy

E.V.  Parfenov; O. B. Kulyasova; Beatriz Mingo; R. G. Farrahkov; Ya. V. Cherneikina; Aleksey Yerokhin; Y. F. Zheng; R. Z. Valiev

doi:10.1016/j.corsci.2019.108303

Influence of ultra-fine grain structure on corrosion behaviour of biodegradable Mg-1Ca alloy

E.V. Parfenov , O. B. Kulyasova, Beatriz Mingo, R. G. Farrahkov, Ya. V. Cherneikina, Aleksey Yerokhin, Y. F. Zheng, R. Z. Valiev

UFA State Aviation Technical University

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Abstract

Biodegradation studies of Mg-1Ca alloy with different microstructures in Ringer’s solution reveal corrosion mechanism based on the balance between the anodic dissolution of the secondary phase and hydroxide precipitation, controlled by the secondary phase size and distribution uniformity. Alloy with ultrafine-grain structure shows at least 5-fold improvement in corrosion resistance compared to the coarse-grained alloy due to the separation of the particles of the secondary phase and its continuous intragranular nano-precipitation. This promotes an unusual low-frequency impedance behaviour described by an inductive loop with the negative time constant, which leads to the increased impedance modulus signifying the improved corrosion resistance.

Original language	English
Journal	Corrosion Science
Early online date	22 Oct 2019
DOIs	https://doi.org/10.1016/j.corsci.2019.108303
Publication status	Published - Feb 2020

Keywords

magnesium alloy
ultra-fine grained alloy
biodegradable implants
secondary phase
nanoprecipitates
electrochemical impedance spectroscopy

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10.1016/j.corsci.2019.108303

accepted_paperAccepted author manuscript, 2.74 MB

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title = "Influence of ultra-fine grain structure on corrosion behaviour of biodegradable Mg-1Ca alloy",

abstract = "Biodegradation studies of Mg-1Ca alloy with different microstructures in Ringer{\textquoteright}s solution reveal corrosion mechanism based on the balance between the anodic dissolution of the secondary phase and hydroxide precipitation, controlled by the secondary phase size and distribution uniformity. Alloy with ultrafine-grain structure shows at least 5-fold improvement in corrosion resistance compared to the coarse-grained alloy due to the separation of the particles of the secondary phase and its continuous intragranular nano-precipitation. This promotes an unusual low-frequency impedance behaviour described by an inductive loop with the negative time constant, which leads to the increased impedance modulus signifying the improved corrosion resistance.",

keywords = "magnesium alloy, ultra-fine grained alloy, biodegradable implants, secondary phase, nanoprecipitates, electrochemical impedance spectroscopy",

author = "E.V. Parfenov and Kulyasova, {O. B.} and Beatriz Mingo and Farrahkov, {R. G.} and Cherneikina, {Ya. V.} and Aleksey Yerokhin and Zheng, {Y. F.} and Valiev, {R. Z.}",

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doi = "10.1016/j.corsci.2019.108303",

language = "English",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Influence of ultra-fine grain structure on corrosion behaviour of biodegradable Mg-1Ca alloy

AU - Parfenov , E.V.

AU - Kulyasova, O. B.

AU - Mingo, Beatriz

AU - Farrahkov, R. G.

AU - Cherneikina, Ya. V.

AU - Yerokhin, Aleksey

AU - Zheng, Y. F.

AU - Valiev, R. Z.

PY - 2020/2

Y1 - 2020/2

N2 - Biodegradation studies of Mg-1Ca alloy with different microstructures in Ringer’s solution reveal corrosion mechanism based on the balance between the anodic dissolution of the secondary phase and hydroxide precipitation, controlled by the secondary phase size and distribution uniformity. Alloy with ultrafine-grain structure shows at least 5-fold improvement in corrosion resistance compared to the coarse-grained alloy due to the separation of the particles of the secondary phase and its continuous intragranular nano-precipitation. This promotes an unusual low-frequency impedance behaviour described by an inductive loop with the negative time constant, which leads to the increased impedance modulus signifying the improved corrosion resistance.

AB - Biodegradation studies of Mg-1Ca alloy with different microstructures in Ringer’s solution reveal corrosion mechanism based on the balance between the anodic dissolution of the secondary phase and hydroxide precipitation, controlled by the secondary phase size and distribution uniformity. Alloy with ultrafine-grain structure shows at least 5-fold improvement in corrosion resistance compared to the coarse-grained alloy due to the separation of the particles of the secondary phase and its continuous intragranular nano-precipitation. This promotes an unusual low-frequency impedance behaviour described by an inductive loop with the negative time constant, which leads to the increased impedance modulus signifying the improved corrosion resistance.

KW - magnesium alloy

KW - ultra-fine grained alloy

KW - biodegradable implants

KW - secondary phase

KW - nanoprecipitates

KW - electrochemical impedance spectroscopy

U2 - 10.1016/j.corsci.2019.108303

DO - 10.1016/j.corsci.2019.108303

M3 - Article

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

ER -

Influence of ultra-fine grain structure on corrosion behaviour of biodegradable Mg-1Ca alloy

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