Early stages of Mg–Nb alloy corrosion in a balanced salt solution – STEM-HAADF and EIS study

IF 0.5 4区化学 Q4 CHEMISTRY, MULTIDISCIPLINARY

Chemija Pub Date : 2020-07-19 DOI:10.6001/chemija.v31i3.4285

K. Leinartas, E. Juzeliūnas, L. Staišiūnas, A. Selskis, A. Grigucevičienė, D. Bučinskienė, R. Juškėnas, A. Ručinskienė

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Abstract

Department of Electrochemical Materials Science, Centre for Physical Sciences and Technology, 3 Saulėtekio Avenue, Vilnius, Lithuania Thin Mg–Nb alloy films having a thickness below 1 μm were deposited by magnetron sputtering on glass substrates with Nb concentrations of 4, 26 and 32 at.%. Distribution of the elements within the deposits was identified by a scanning transmission electron microscope (STEM) equipped with a high angle annular dark field (HAADF) detector, which showed on a nanometer scale fine Nb-enriched structures. XRD identified nano-crystallinity of the deposits with grain sizes of the order of tens of nanometers. The corrosion behaviour of the films has been studied in a balanced salt solution, whose pH and ion concentrations were close to those of the human blood plasma. The electrochemical impedance spectroscopy implied a localized corrosion with diffusion limitations within a layer of corrosion products. The corrosion rates were determined in situ by Tafel extrapolation and EIS-derived polarization resistance; both methods provided reliable results for corrosion resistant alloy with ca. one third of Nb. Alloying of Mg with Nb makes it possible to adjust the corrosion activity of the alloy according to biomedical requirements for in vivo applications.

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平衡盐溶液中Mg-Nb合金腐蚀的早期阶段- STEM-HAADF和EIS研究

采用磁控溅射技术，在铌浓度分别为4、26和32 at.%的玻璃衬底上沉积了厚度小于1 μm的Mg-Nb合金薄膜。利用扫描透射电子显微镜(STEM)和高角环形暗场(HAADF)探测器对矿床内元素的分布进行了鉴定，显示出纳米尺度上的精细富铌结构。XRD表征了晶粒尺寸为几十纳米的镀层的纳米结晶度。在pH值和离子浓度接近人血浆的平衡盐溶液中，研究了薄膜的腐蚀行为。电化学阻抗谱表明，在腐蚀产物的一层内存在局部腐蚀和扩散限制。采用Tafel外推法和eis极化电阻法原位测定腐蚀速率;两种方法对含约三分之一铌的耐腐蚀合金均提供了可靠的结果。Mg与Nb的合金化使得根据生物医学对体内应用的要求来调整合金的腐蚀活性成为可能。

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

Chemija 化学-化学综合

CiteScore

1.30

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： Chemija publishes original research articles and reviews from all branches of modern chemistry, including physical, inorganic, analytical, organic, polymer chemistry, electrochemistry, and multidisciplinary approaches.