Gorejová Radka, Šišoláková Ivana, Cipa Pavol, Džunda Róbert, Sopčák Tibor, Oriňak Andrej, Oriňaková Renáta
Department of Physical Chemistry, P. J. Šafárik University in Košice, Moyzesova 11, 040 01 Košice, Slovakia.
Institute of Material Research, Slovak Academy of Science, Watsonova 47, 040 01 Košice, Slovakia.
Materials (Basel). 2021 Aug 31;14(17):4983. doi: 10.3390/ma14174983.
Powder metallurgy is one of the most prevalent ways for metallic degradable materials preparation. Knowledge of the properties of initial powders used during this procedure is therefore of great importance. Two different metals, iron and zinc, were selected and studied in this paper due to their promising properties in the field of biodegradable implants. Raw powders were studied using scanning electron microscopy (SEM) coupled with energy dispersive spectrometry (EDX). Powders (Fe, Zn and Fe-Zn in a weight ratio of 1:1) were then compressed at the pressure of 545 MPa to the form of pellets with a diameter of 1.7 cm. Surface morphology and degradation behavior in the Hanks´ solution were studied and evaluated. Electrochemical polarization tests along with the static immersion tests carried out for 21 days were employed for corrosion behavior characterization. The highest corrosion rate was observed for pure Zn powder followed by the Fe-Zn and Fe, respectively. A mixed Fe-Zn sample showed similar properties as pure zinc with no signs of iron degradation after 21 days due to the effect of galvanic protection secured by the zinc acting as a sacrificial anode.
粉末冶金是制备金属可降解材料最普遍的方法之一。因此，了解该过程中使用的初始粉末的特性非常重要。由于铁和锌这两种不同的金属在可生物降解植入物领域具有良好的性能，本文对其进行了选择和研究。使用扫描电子显微镜（SEM）结合能量色散光谱（EDX）对原始粉末进行了研究。然后将粉末（铁、锌和重量比为1:1的铁 - 锌）在545 MPa的压力下压制成直径为1.7 cm的小球形式。研究并评估了在汉克斯溶液中的表面形态和降解行为。采用电化学极化测试以及进行21天的静态浸泡测试来表征腐蚀行为。观察到纯锌粉末的腐蚀速率最高，其次是铁 - 锌和铁。由于锌作为牺牲阳极提供的电偶保护作用，混合的铁 - 锌样品在21天后表现出与纯锌相似的性能，没有铁降解的迹象。
