Influence of Uric Acid on the Corrosion Behavior of AZ31 Magnesium Alloy in Simulated Body Fluid

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2024-09-16 DOI:10.1007/s11665-024-10083-8

Y. Zhang, D. Y. Ma, J. Y. Dai, L. P. Wu

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Abstract

The action mechanism of uric acid, C₅H₄N₄O₃ (UA), and the effect of its concentration (0, 100, 416 and 500 μM) on the corrosion behavior of AZ31 Mg alloy in simulated body fluid were unmasked using scanning electron microscopy, x-ray diffraction, Raman, x-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, potentiostatic polarization, potentiodynamic polarization, and hydrogen evolution tests. It was shown that UA was initially dissociated into (C₅H₄N₄O₃)⁻ (UA⁻) and precipitated as (C₅H₄N₄O₃)₂Mg ((UA⁻)₂Mg). With the generation of (UA⁻)₂Mg, hydroxyapatite (HA) was continuously formed, enhancing the corrosion resistance of AZ31 Mg alloy. Subsequently, UA⁻ was transformed into C₅H₂N₄O₃ and chelated with Ca in HA as Ca(C₅H₂N₄O₃), resulting in a loss of HA and undermining the corrosion resistance of AZ31 Mg alloy. UA inhibited the corrosion of AZ31 Mg alloy with an optimal concentration of 416 μM. The inhibition of UA on the corrosion of AZ31 Mg alloy was closely related with the content of (UA^-)₂ Mg, Mg₃(PO₄)₂, and Mg(OH)₂ in the corrosion products.

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尿酸对模拟体液中 AZ31 镁合金腐蚀行为的影响

利用扫描电子显微镜、X 射线衍射、拉曼、X 射线光电子能谱、电化学阻抗能谱、静电极化、电位极化和氢演化试验，揭示了尿酸 C5H4N4O3（UA）的作用机理及其浓度（0、100、416 和 500 μM）对模拟体液中 AZ31 镁合金腐蚀行为的影响。结果表明，UA 最初离解为 (C5H4N4O3)- (UA-)，并沉淀为 (C5H4N4O3)2Mg ((UA-)2Mg)。随着（UA-）2Mg 的生成，羟基磷灰石（HA）不断形成，增强了 AZ31 镁合金的耐腐蚀性。随后，UA- 转化为 C5H2N4O3，并与 HA 中的 Ca 螯合为 Ca(C5H2N4O3)，导致 HA 损失，削弱了 AZ31 Mg 合金的耐腐蚀性。UA 可抑制 AZ31 Mg 合金的腐蚀，其最佳浓度为 416 μM。UA 对 AZ31 Mg 合金腐蚀的抑制作用与腐蚀产物中 (UA-)2 Mg、Mg3(PO4)2 和 Mg(OH)2 的含量密切相关。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered