A new look into the electrochemical impedance spectra of plasma electrolytic oxidation coatings on Mg-Zn-Ca alloy in simulated body fluid electrolyte

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2025-09-15 DOI:10.1007/s10853-025-11339-x

Shuhan Meng, Kexin Liu, Yuxin Zhang, Zheyuan Tang, Jiaxi Liu, Peng Zhou, Tao Zhang, Yi Zhang, Łukasz Maj, Fuhui Wang

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Abstract

Electrochemical impedance spectroscopy (EIS) is a very useful electrochemical measurement to estimate the corrosion degradation behavior of Mg alloys in simulated body fluid (SBF). However, conventional interpretation of EIS results relies on the selection of equivalent circuit without associating clear physical meaning of each component to the electrochemical system. In this work, a Mg-Zn-Ca bio-magnesium alloy, with its surface being covered by a plasma electrolytic oxidation (PEO) coating and being further sealing post-treated by a phosphate chemical conversion coating (PCC), was immersed in the SBF. Surface morphology and composition were monitored and compared. Results showed that the EIS being directly fitted using ECs could offer valuable information for qualitative information. However, the high-frequency pseudo-capacitive loop due to the oxide impedance, rather than the double layer, can be interpreted using a Young model. The mid-frequency and low-frequency response of the spectra involves the diffusion and faradaic reactions, but the localized corrosion yields the spectra susceptible to the impact of nonsteady-state fluctuations caused by localized corrosion.

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模拟体液电解质中Mg-Zn-Ca合金等离子体电解氧化膜的电化学阻抗谱研究

电化学阻抗谱（EIS）是评价镁合金在模拟体液（SBF）中的腐蚀降解行为的一种非常有用的电化学测量方法。然而，传统的EIS结果解释依赖于等效电路的选择，而没有将每个组件与电化学系统明确的物理含义联系起来。本研究将Mg-Zn-Ca生物镁合金浸泡在SBF中，表面覆盖等离子体电解氧化（PEO）涂层，再经过磷酸盐化学转化涂层（PCC）进一步密封处理。对表面形貌和成分进行了监测和比较。结果表明，用ECs直接拟合EIS可以为定性信息提供有价值的信息。然而，由于氧化物阻抗，而不是双层，高频伪电容回路可以用Young模型来解释。光谱的中频和低频响应涉及扩散和法拉第反应，但局部腐蚀产生的光谱容易受到局部腐蚀引起的非稳态波动的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.