Hanke Lisa, Jessen Lea K, Weisheit Felix, Bhat Krathika, Westernströer Ulrike, Garbe-Schönberg Dieter, Willumeit-Römer Regine, Quandt Eckhard
Inorganic Functional Materials, Institute for Materials Science, Faculty of Engineering, Kiel University, Kiel, Germany.
Institute of Metallic Biomaterials, Helmholtz Centre Hereon, Geesthacht, Germany.
Sci Rep. 2023 Aug 3;13(1):12572. doi: 10.1038/s41598-023-39493-9.
Freestanding thin films of Mg-Li (magnesium-lithium) alloys with a Li mass fraction between 1.6% (m/m) and 9.5% (m/m) were prepared and studied with respect to their structure and degradation properties. With increasing Li content, the microstructure deviates from hexagonal Mg-Li with strict columnar growth and preferred orientation, and additional cubic Mg-Li and LiCO occur. The corrosion rate was measured in Hanks' balanced salt solution by potentiodynamic polarisation and weight loss measurements to investigate biodegradation. Influences of the orientation, phase and protective layer formation lead to an increase in corrosion from 1.6 to 5.5% (m/m) from 0.13 ± 0.03 to 0.67 ± 0.29 mm/year when measured by potentiodynamic polarisation but a similar corrosion rate for 9.5% (m/m) and 3% (m/m) of Li of 0.27 ± 0.07 mm/year and 0.26 ± 0.05 mm/year.
制备了锂质量分数在1.6%（m/m）至9.5%（m/m）之间的独立Mg-Li（镁-锂）合金薄膜，并对其结构和降解性能进行了研究。随着锂含量的增加，微观结构偏离具有严格柱状生长和择优取向的六方Mg-Li，出现了额外的立方Mg-Li和LiCO。通过动电位极化和失重测量在汉克斯平衡盐溶液中测量腐蚀速率，以研究生物降解。取向、相和保护层形成的影响导致通过动电位极化测量时，腐蚀速率从锂含量1.6%（m/m）时的0.13±0.03毫米/年增加到5.5%（m/m）时的0.67±0.29毫米/年，但锂含量为9.5%（m/m）和3%（m/m）时的腐蚀速率相似，分别为0.27±0.07毫米/年和0.26±0.05毫米/年。
