中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 7 July 2023 |
（1. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;
2. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China;
3. Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin 300384, China;
4. National Demonstration Center for Experimental Function Materials Education, Tianjin University of Technology, Tianjin 300384, China）
Abstract:The stress corrosion cracking behavior of Mg-3wt.%Zn-0.2wt.%Ca (MZC) alloy and fluoride (MgF2) coated Mg-3wt.%Zn-0.2wt.%Ca alloy (MZC-MF) for bone implant applications was investigated using slow strain- rate tensile (SSRT) tests in simulated body fluid (SBF). The results show that MgF2 coating could significantly improve the corrosion resistance and prolonged fracture failure time of MZC alloy. MgF2 coating also greatly reduced the stress corrosion cracking sensitivity of MZC alloy in SBF. Compared to MZC alloy, stress corrosion cracking sensitivity index (Iscc) of MZC-MF alloy decreased by 21% (ultimate tensile strength, UTS), 22% (time to failure, tf), 23% (elongation after fracture, δ), 7% (reduction ratio of cross-sectional area after fracture, φ) and 15% (inner product work, A), respectively.
Key words: Mg-Zn-Ca alloy; MgF2 coating; stress corrosion sensitivity; stress corrosion cracking; fracture failure mode
