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 - Journal Article
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
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA MŠMT(CZ) EF18_053/0016627
Grant - others: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
Research Infrastructure: CzechNanoLab - 90110; CzechNanoLab II - 90251
Institutional support: RVO:68378271
Keywords : biodegradable metals * zinc-based alloy * characterization * mechanism * ECAP
OECD category: Materials engineering
Impact factor: 18.9, year: 2022
Method of publishing: 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.
Permanent Link: https://hdl.handle.net/11104/0343180