Construction of Fe/Ag galvanic couple by mechanochemical in-situ reduced Ag to accelerate the degradation of Fe-based implant

Science China Technological Sciences - Tập 66 - Trang 2824-2836 - 2023
WenJing Yang1, Hao Song1, ZhengYu Zhao2, CiJun Shuai1,2,3, Hao Pan4
1Institute of Bioadditive Manufacturing, Jiangxi University of Science and Technology, Nanchang, China
2School of Sino-German Robotics, Shenzhen Institute of Information Technology, Shenzhen, China
3State Key Laboratory of Precision Manufacturing for Extreme Service Performance, College of Mechanical and Electrical Engineering, Central South University, Changsha, China
4Department of Periodontics & Oral Mucosal Section, Xiangya Stomatological Hospital, Central South University, Changsha, China

Tóm tắt

Orthopedic applications of Fe have been hindered by the insufficient degradation rate. Alloying with noble elements (such as Ag, Au, and Pt) to generate galvanic couples is a feasible approach. However, the direct preparation of homogenous alloys by mechanical alloying or metallurgy is difficult because of the differences in strength, density, and toughness. In this study, Ag2O was selected as the precursor phase for incorporation into Fe to achieve a homogeneous distribution of Ag, which was then reduced in situ to Ag via a mechanochemical reduction reaction during mechanical alloying. The composite powders were printed as implants by selective laser melting, where a fast cooling rate contributed to the retention of the phase distribution of the obtained powder. The electrochemical tests showed that the Fe-Ag2O implant had a high corrosion current density (21.88 ± 0.12 µA/cm2) and instantaneous corrosion rate (0.23 ± 0.05 mm/year). Moreover, the implant exhibited a faster degradation rate (0.22 mm/year) than Fe (0.15 mm/year) and Fe-Ag (0.21 mm/year) after immersion for 28 d. The acceleration mechanism of the implant could be attributed to the uniformly distributed Ag particles triggering many galvanic couples with the Fe grains, which was confirmed by the observation of the corrosion surface. In addition, the composite implants exhibited good biocompatibility and antibacterial properties.

Tài liệu tham khảo

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