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温度上升加快了Ti-6Al-4V氧化物降解和选择性溶解:基于阿雷尼乌斯的分析

Michael A Kurtz¹, Kazzandra Alaniz¹, Lilliana M Taylor¹

¹Department of Bioengineering, Clemson University, Clemson, SC, USA; The Clemson University-Medical University of South Carolina Bioengineering Program, Charleston, SC, USA.

Acta biomaterialia

|February 28, 2024

概括

使用更高温度的加速测试快速诱导植入物的选择性溶解,模仿体内腐蚀. 这种新方法有助于更有效地评估生物材料和植入物设计.

科学领域:

材料科学材料科学材料科学
生物材料工程生物材料工程
腐蚀科学腐蚀科学

背景情况:

-- (Ti-6Al-4V) 合金的选择性溶解在骨科植入物中发生,但目前的临床前测试无法复制这种损伤.
Ti-6Al-4V被广泛用于植入物,包括增材制造的设备,了解其腐蚀对于患者安全至关重要.
现有的测试方法无法准确预测体内腐蚀,强调需要加快和可靠的临床前评估.

研究的目的:

开发一种加速的临床前方法,使用高温快速诱导Ti-6Al-4V的选择性溶解.
在不同温度下研究溶解合金表面及其氧化物层之间的结构性质关系.
建立加速测试条件和生理学上相关的腐蚀机制之间的相关性.

主要方法:

电化学阻抗光谱 (EIS) 用于监测氧化膜的降解和极化电阻 (Rp) 在24°C,37°C和45°C.
扫描电子显微镜 (SEM) 基于EIS数据量化了选择性溶解的程度.
采用阿雷尼乌斯方法,将不同温度的腐蚀速率与生理学上相关的条件联系起来.

主要成果:

电化学阻抗光谱显示,随着时间的推移和温度的增加,RP显著下降,表明氧化物降解加速.
腐蚀速率以阿雷尼乌斯依赖的方式随着温度的上升而增加.
确定了三种不同的表面类别 (未溶解,过渡,溶解),与氧化物特性变化相关.

结论:

高温可以加速Ti-6Al-4V的选择性溶解,为临床前测试提供了可行的方法.
在腐蚀溶液,氧化膜和基质合金之间存在着明显的温度和度依赖关系.
超生理温度可以诱导类似于生理条件的溶解模式,但在显著减少的实验时间内.

关键词:

阿雷尼乌斯 (Arrhenius) 是一个古老的科学家.腐蚀是一种腐蚀.电化学阻抗光谱学电化学阻抗光谱学选择性溶解是一种选择性溶解.在Ti-6Al-4V中.

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