Kania Aneta, Szindler Magdalena M, Szindler Marek, Brytan Zbigniew, Łoński Wojciech
Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18a, 44-100 Gliwice, Poland.
Scientific and Didactic Laboratory of Nanotechnology and Material Technologies, Faculty of Mechanical Engineering, Silesian University of Technology, Towarowa 7, 44-100 Gliwice, Poland.
Materials (Basel). 2024 Jul 6;17(13):3348. doi: 10.3390/ma17133348.
Magnesium and its alloys are attractive temporary implants due to their biocompatibility and biodegradability. Moreover, Mg has good mechanical and osteoinductive properties. But magnesium and Mg alloys have one significant disadvantage: poor corrosion resistance in a physiological environment. Hence, a deposition of various layers on the surface of Mg alloys seems to be a good idea. The purpose of the article is to analyze the structure and morphology of two MgCa2Zn1 and MgCa2Zn1Gd3 alloys coated by SnO ALD (atomic layer deposition) films of various thickness. The studies were performed using scanning electron microscopy (SEM), X-ray fluorescence (XRF), and an X-ray diffractometer. The corrosion activity of the thin films and substrate alloys in a chloride-rich Ringer's solution at 37 °C was also observed. The corrosion tests that include electrochemical, immersion measurements, and electrochemical impedance spectroscopy (EIS) were evaluated. The results indicated that SnO had a heterogeneous crystal structure. The surfaces of the thin films were rough with visible pores. The corrosion resistance of SnO measured in all corrosion tests was higher for the thicker films. The observations of corrosion products after immersion tests indicated that they were lamellar-shaped and mainly contained Mg, O, Ca, and Cl in a lower concentration.
镁及其合金因其生物相容性和生物可降解性而成为有吸引力的临时植入物。此外，镁具有良好的机械性能和骨诱导性能。但是镁和镁合金有一个显著缺点：在生理环境中耐腐蚀性差。因此，在镁合金表面沉积各种涂层似乎是个好主意。本文的目的是分析两种涂覆有不同厚度SnO原子层沉积（ALD）薄膜的MgCa2Zn1和MgCa2Zn1Gd3合金的结构和形态。研究使用扫描电子显微镜（SEM）、X射线荧光光谱（XRF）和X射线衍射仪进行。还观察了薄膜和基底合金在37℃富含氯化物的林格氏溶液中的腐蚀活性。对包括电化学测试、浸泡测量和电化学阻抗谱（EIS）在内的腐蚀试验进行了评估。结果表明，SnO具有非均相晶体结构。薄膜表面粗糙，有可见孔隙。在所有腐蚀试验中，较厚薄膜的SnO耐腐蚀性更高。浸泡试验后对腐蚀产物的观察表明，它们呈层状，主要含有镁、氧、钙，氯的含量较低。
