Biodegradable PMMA coated Zn–Mg alloy with bimodal grain structure for orthopedic applications-A promising alternative  

作　　者：Alia ADiaa Nahed El-Mahallawy Madiha Shoeib Flavien Mouillard Tom Ferte Patrick Masson Adele Carrado 

机构地区：[1]Design and Production Engineering Department,Faculty of Engineering,Ain Shams University,Cairo,11517,Egypt [2]Department of Design and Production Engineering,Faculty of Engineering and Materials Science,German University in Cairo,Cairo,11835,Egypt [3]Central Metallurgical Research and Development Institute,El Tebbin,Cairo,11722,Egypt [4]Institut de Physique et Chimie des Mat′eriaux de Strasbourg,IPCMS,UMR 7504 CNRS,Universit′e de Strasbourg,67000,Strasbourg,France

出　　处：《Bioactive Materials》2024年第9期479-491,共13页生物活性材料（英文）

摘　　要：The study examines the impact of microstructure and polymethyl methacrylate (PMMA) grafting on the degradability of Zn–Mg alloys. The mechanical properties ofa Zn alloy containing 0.68 wt% Mg and extruded at 200 ◦C are enhanced for degradable load-bearing applications, addressing a crucial need in the field. The materialexhibits a bimodal grain size distribution that is random texture, consisting of secondary phases, grains, and sub-grains. With an elongation to failure of 16 %, theyield and ultimate tensile strengths are 325.9 and 414.5 MPa, respectively, and the compressive yield strength is 450.5 MPa.The “grafting-from” method was used to coat a few micrometers thick of PMMA on both bulk and scaffold Zn alloys to mitigate the corrosion rate. The last one is aporous structure, with a porosity of 65.8 %, considered as in the first approach of an orthopedic implant. After being immersed for 720 h, the PMMA-grafted bulkalloy’s corrosion rate decreased from 0.43 to 0.25 mm/y. Similarly, the scaffold alloy’s corrosion rate reduced from 1.24 to 0.49 mm/y. These results indicate that themethod employed could be used for future orthopedic applications.

关 键 词：alloy corrosion GRAIN 

分 类 号：TG146.22[一般工业技术—材料科学与工程]