Corrosion in Hank's Solution and Mechanical Strength of Ultrafine‐Grained Pure Iron,Advanced Engineering Materials

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Corrosion in Hank's Solution and Mechanical Strength of Ultrafine‐Grained Pure Iron
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-13 , DOI: 10.1002/adem.202000183
Beatriz Araújo Batista ₁ , Renata Braga Soares ₁ , Vanessa de Freitas Cunha Lins ₁ , Roberto Braga Figueiredo ₂ , Anton Hohenwarter ₃ , Tulio Matencio ₄

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In recent years, there has been a growing interest in developing biodegradable implants which are absorbed by the body after fulfilling a task. Pure iron is a candidate for such applications because it is considered biocompatible and it does not passivate in physiological media. Herein, the potential to increase the strength of pure iron through grain refinement is evaluated to allow a reduction in size of implants and its effect on corrosion behavior. High‐pressure torsion is applied to process pure iron and to refine the grain size of less than 1 μm. Annealing at different temperatures is used to produce samples with different grain sizes. Compression tests show a significant increase in flow stress to over 1 GPa in samples with very small grain sizes. However, such structure is associated with negligible strain hardening and strain‐rate sensitivity. Electrochemical and immersion tests in Hank's solution show that the grain refinement reduces the corrosion rate significantly. Samples with grain sizes smaller than 1 μm display uniform corrosion and develop a homogeneous surface layer of corrosion products. Thus, severe plastic deformation followed by annealing produces mechanically stronger pure iron with reduced biodegradability.

中文翻译：

超细晶粒纯铁在汉克溶液中的腐蚀和机械强度

近年来，人们对开发可生物降解的植入物越来越感兴趣，该植入物在完成任务后会被人体吸收。纯铁是此类应用的候选者，因为它被认为具有生物相容性，并且不会在生理介质中钝化。在此，评估了通过晶粒细化增加纯铁强度的潜力，以允许减小植入物的尺寸及其对腐蚀行为的影响。施加高压扭力来加工纯铁并细化小于1μm的晶粒。在不同温度下进行退火可生产出具有不同晶粒度的样品。压缩测试表明，在晶粒非常小的样品中，流动应力显着增加到1 GPa以上。然而，这种结构与可忽略不计的应变硬化和应变速率敏感性有关。Hank溶液中的电化学和浸没测试表明，细化晶粒可以显着降低腐蚀速率。粒度小于1μm的样品显示出均匀的腐蚀并形成均匀的腐蚀产物表面层。因此，剧烈的塑性变形随后退火会产生机械强度更高的纯铁，且生物降解性降低。

更新日期：2020-04-13

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