Study of the Properties and Microstructures of Biodegradable Zn-0.5Sr Alloy for Biomedical Use by Different Ultrasonic Time Treatments
Author of the article:ZHANG Jiao, QIAO Hongkai, ZHAO Zhixin, ZHU Peiyi, LI Qinglin
Author's Workplace:School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730000, China
Key Words:Zn-0.5Sr alloy; ultrasonic treatment; microstructure; degradation rate
Abstract:
To enhance the mechanical properties of biodegradable Zn alloys used in biological medical applications and simultaneously ensure that the corrosion rate meets the requirements for implantation in the human body, the impact of varying ultrasonic treatment time (0, 2, 5 and 8 min) on the microstructure and properties of Zn-0.5Sr alloys was investigated at a constant ultrasonic power of 600 W. The results reveal that reducing the ultrasonic time to 5 min results in a decrease in the size of the primary α-Zn and SrZn 13 second phase to 87.24 and 35.01 μm, respectively. Additionally, the tensile strength of the alloy increases to 118.93 MPa, and the elongation increases to 1.32% . The results of 15-day immersion corrosion experiments show that the corrosion rate of the alloy without ultrasonic treatment has the lowest value of 0.046 mm/a, and when the ultrasonic time reaches 5 min, the corrosion rate of the alloy increases to (0.085±0.003 1) mm/a. The electrochemical experimental results show that the corrosion rate of the Zn-0.5Sr alloy after an ultrasonic treatment time of 5 min increases from (2.340±0.159) mm/a to (5.207±0.354) mm/a.