Fatigue and Corrosion Fatigue Properties of Mg–Zn–Zr–Nd Alloys in Glucose-Containing Simulated Body Fluids

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Xue Han, Dan Zhang, Song Zhang, Mohammed R. I. Abueida, Lili Tan, Xiaopeng Lu, Qiang Wang, Huanye Liu
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Abstract

Medical bone implant magnesium (Mg) alloys are subjected to both corrosive environments and complex loads in the human body. The increasing number of hyperglycemic and diabetic patients in recent years has brought new challenges to the fatigue performance of Mg alloys. Therefore, it is significant to study the corrosion fatigue (CF) behavior of medical Mg alloys in glucose-containing simulated body fluids for their clinical applications. Herein, the corrosion and fatigue properties of extruded Mg-Zn-Zr-Nd alloy in Hank’s balanced salt solution (HBSS) containing different concentrations (1 g/L and 3 g/L) of glucose were investigated. The average grain size of the alloy is about 5 μm, which provides excellent overall mechanical properties. The conditional fatigue strength of the alloy was 127 MPa in air and 88 MPa and 70 MPa in HBSS containing 1 g/L glucose and 3 g/L glucose, respectively. Fatigue crack initiation points for alloys in air are oxide inclusions and in solution are corrosion pits. The corrosion rate of the alloy is high at the beginning, and decreases as the surface corrosion product layer thickens with the increase of immersion time. The corrosion products of the alloy are mainly Mg(OH)2, MgO and a small amount of Ca-P compounds. The electrochemical results indicated that the corrosion rate of the alloys gradually decreased with increasing immersion time, but the corrosion tendency of the alloy was greater in HBSS containing 3 g/L glucose. On the one hand, glucose accelerates the corrosion process by adsorbing large amounts of aggressive Cl ions. On the other hand, glucose will be oxidized to form gluconic acid, and then reacts with Mg(OH)2 and MgO to form Mg gluconate, which destroys the corrosion product film and leads to the aggravation of corrosion and the accumulation of fatigue damage.

Abstract Image

含葡萄糖模拟体液中 Mg-Zn-Zr-Nd 合金的疲劳和腐蚀疲劳特性
医用骨植入物镁(Mg)合金在人体中既要承受腐蚀性环境,又要承受复杂的负荷。近年来,高血糖和糖尿病患者的数量不断增加,给镁合金的疲劳性能带来了新的挑战。因此,研究医用镁合金在含葡萄糖模拟体液中的腐蚀疲劳(CF)行为对其临床应用具有重要意义。本文研究了挤压 Mg-Zn-Zr-Nd 合金在含有不同浓度(1 g/L 和 3 g/L)葡萄糖的 Hank 平衡盐溶液(HBSS)中的腐蚀和疲劳性能。合金的平均晶粒大小约为 5 μm,具有优异的整体机械性能。合金在空气中的条件疲劳强度为 127 兆帕,在含有 1 克/升葡萄糖和 3 克/升葡萄糖的 HBSS 中的条件疲劳强度分别为 88 兆帕和 70 兆帕。合金在空气中的疲劳裂纹起始点是氧化物夹杂,在溶液中的起始点是腐蚀坑。合金的腐蚀速率在开始时很高,随着浸泡时间的延长,表面腐蚀产物层变厚,腐蚀速率随之降低。合金的腐蚀产物主要是 Mg(OH)2、MgO 和少量 Ca-P 化合物。电化学结果表明,随着浸泡时间的延长,合金的腐蚀速率逐渐降低,但在含有 3 g/L 葡萄糖的 HBSS 中,合金的腐蚀倾向更大。一方面,葡萄糖通过吸附大量侵蚀性 Cl- 离子加速了腐蚀过程。另一方面,葡萄糖会被氧化生成葡萄糖酸,然后与 Mg(OH)2 和 MgO 反应生成葡萄糖酸镁,从而破坏腐蚀产物膜,导致腐蚀加剧和疲劳损伤累积。
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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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