Origin of the time-dependent corrosion behavior of biodegradable Mg-Si-Zn alloys in simulated body fluid

被引：7

作者：

de Gouveia, Guilherme Lisboa ^{[1
,2
]}

Spinelli, Jose Eduardo ^{[2
]}

Koga, Guilherme Yuuki ^{[2
]}

机构：

[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Rod Washington Luis Km 235, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Fed Sao Carlos, Dept Mat Sci & Engn, Rod Washington Luis, BR-13565905 Sao Carlos, SP, Brazil

来源：

CORROSION SCIENCE | 2024年 / 237卷

基金：

巴西圣保罗研究基金会;

关键词：

Magnesium; (A) Intermetallics; (B) EIS; (B) Polarization; (C) Hydrogen overpotential; (C) Interfaces; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; MECHANICAL-PROPERTIES; MEASUREMENT MODELS; MAGNESIUM ALLOY; PURE MAGNESIUM; MICROSTRUCTURE; CA; RESISTANCE; PHASE; BIOCOMPATIBILITY;

D O I：

10.1016/j.corsci.2024.112326

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion behavior of Mg-0.6%Si-2%Zn alloys in simulated body fluid was studied to understand the time- dependent processes and interfacial phenomena. The alloy's microstructure includes Mg-rich dendrites within eutectic microconstituent. Electrochemical responses showed minimal dependence on dendritic-spacing. Initial immersion (12.2-hour) formed a protective layer, indicated by potential elevation, polarization resistance escalation, and changes in Nyquist and Bode plots. However, between 12.2- and 168.4-hour, the protective layer integrity decreased, with observable corrosion. The corrosion mechanism involved protective layer formation followed by cracking induced by Pilling-Bedworth ratio and high H2 2 evolution kinetics. This time-dependent corrosion resistance resembles both corrosion-resistant and corrosion-sensitive Mg alloys, showcasing challenges in accurate assessment.

引用

页数：17

共 76 条

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