A detailed mechanism of degradation behaviour of biodegradable as-ECAPed Zn-0.8Mg-0.2Sr with emphasis on localized corrosion attack

0572233 - FZÚ 2024 RIV CN eng J - Článek v odborném periodiku
Pinc, Jan - Školáková, Andrea - Hybášek, V. - Msallamová, Š. - Veřtát, Petr - Ashcheulov, Petr - Vondráček, Martin - Duchoň, Jan - McCarroll, I. - Hývl, Matěj - Banerjee, Swarnendu - Drahokoupil, Jan - Kubásek, J. - Vojtěch, D. - Čapek, Jaroslav
A detailed mechanism of degradation behaviour of biodegradable as-ECAPed Zn-0.8Mg-0.2Sr with emphasis on localized corrosion attack.
BIOACT MATER. Roč. 27, Sep (2023), s. 447-460. E-ISSN 2452-199X
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA MŠMT(CZ) EF18_053/0016627
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760; OP VVV - Mobility FZU 2(XE) CZ.02.2.69/0.0/0.0/18_053/0016627
Výzkumná infrastruktura: CzechNanoLab - 90110; CzechNanoLab II - 90251
Institucionální podpora: RVO:68378271
Klíčová slova: biodegradable metals * zinc-based alloy * characterization * mechanism * ECAP
Obor OECD: Materials engineering
Impakt faktor: 18.9, rok: 2022
Způsob publikování: Open access

In this study, advanced techniques such as atom probe tomography, atomic force microscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy were used to determine the corrosion mechanism of the as-ECAPed Zn-0.8Mg-0.2Sr alloy. The influence of microstructural and surface features on the corrosion mechanism was investigated. Despite its significance, the surface composition before exposure is often neglected by the scientific community. The analyses revealed the formation of thin ZnO, MgO, and MgCO3 layers on the surface of the material before exposure. These layers participated in the formation of corrosion products, leading to the predominant occurrence of hydrozincite. In addition, the layers possessed different resistance to the environment, resulting in localized corrosion attacks. The segregation of Mg on the Zn grain boundaries with lower potential compared with the Zn-matrix was revealed by atom probe tomography and atomic force microscopy.
Trvalý link: https://hdl.handle.net/11104/0343180