Panaghie Cătălin, Zegan Georgeta, Sodor Alina, Cimpoeșu Nicanor, Lohan Nicoleta-Monica, Istrate Bogdan, Roman Ana-Maria, Ioanid Nicoleta
Faculty of Materials Science and Engineering, "Gh. Asachi" Technical University from Iasi, 700050 Iasi, Romania.
Faculty of Dental Medicine, "Grigore T. Popa" University of Medicine and Pharmacy, 700115 Iasi, Romania.
Materials (Basel). 2023 Apr 14;16(8):3092. doi: 10.3390/ma16083092.
Biodegradable metallic materials are increasingly gaining ground in medical applications. Zn-based alloys show a degradation rate between those recorded for Mg-based materials with the fastest degradation rate and Fe-based materials with the slowest degradation rate. From the perspective of medical complications, it is essential to understand the size and nature of the degradation products developed from biodegradable materials, as well as the stage at which these residues are eliminated from the body. This paper presents investigations conducted on the corrosion/degradation products of an experimental material (ZnMgY alloy in cast and homogenized state) after immersion tests in three physiological solutions (Dulbecco's, Ringer's and simulated body fluid (SBF)). Scanning electron microscopy (SEM) was used to highlight the macroscopic and microscopic aspects of corrosion products and their effects on the surface. An X-ray energy dispersive detector (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) provided general information about the compounds based on their non-metallic character. The pH of the electrolyte solution was recorded for 72 h during immersion. The pH variation of the solution confirmed the main reactions proposed for the corrosion of ZnMg. The agglomerations of corrosion products were on the micrometer scale, mainly oxides, hydroxides and carbonates or phosphates. The corrosion effects on the surface were homogeneously spread, with a tendency to connect and form cracks or larger corrosion zones, transforming the pitting corrosion pattern into a generalized one. It was noticed that the alloy's microstructure strongly influences the corrosion characteristics.
可生物降解金属材料在医学应用中越来越受到青睐。锌基合金的降解速率介于降解速率最快的镁基材料和降解速率最慢的铁基材料之间。从医学并发症的角度来看，了解可生物降解材料产生的降解产物的大小和性质，以及这些残留物从体内消除的阶段至关重要。本文介绍了对一种实验材料（铸造和均质状态的ZnMgY合金）在三种生理溶液（杜氏溶液、林格氏溶液和模拟体液（SBF））中进行浸泡试验后的腐蚀/降解产物所进行的研究。使用扫描电子显微镜（SEM）来突出腐蚀产物的宏观和微观方面及其对表面的影响。X射线能量色散探测器（EDS）、X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）根据化合物的非金属特性提供了有关它们的一般信息。在浸泡过程中记录了72小时内电解质溶液的pH值。溶液的pH值变化证实了所提出的锌镁腐蚀的主要反应。腐蚀产物的团聚体在微米尺度上，主要是氧化物、氢氧化物以及碳酸盐或磷酸盐。表面的腐蚀效应均匀分布，有连接并形成裂纹或更大腐蚀区域的趋势，将点蚀模式转变为普遍腐蚀模式。值得注意的是，合金的微观结构强烈影响腐蚀特性。
