Effect of MgF<SUB>2</SUB> coating on stress corrosion cracking behavior of Mg-Zn-Ca alloy in simulated body fluid

Yu-fengLI,Bo-wenWANG,Xiao-haoSUN,De-baoLIU

doi:10.1016/S1003-6326(23)66242-9

Transactions of Nonferrous Metals Society of China >

2023 , Vol. 33 >Issue 7: 2044 - 2053

DOI: https://doi.org/10.1016/S1003-6326(23)66242-9

Materials Science and Engineering

Effect of MgF₂ coating on stress corrosion cracking behavior of Mg-Zn-Ca alloy in simulated body fluid

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Yu-feng LI^1,2, Bo-wen WANG¹, Xiao-hao SUN³, De-bao LIU⁴

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

Online published: 2023-07-25

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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 (I_scc) of MZC-MF alloy decreased by 21% (ultimate tensile strength, UTS), 22% (time to failure, t_f), 23% (elongation after fracture, δ), 7% (reduction ratio of cross-sectional area after fracture, φ) and 15% (inner product work, A), respectively.

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Yu-fengLI,Bo-wenWANG,Xiao-haoSUN,De-baoLIU . Effect of MgF₂ coating on stress corrosion cracking behavior of Mg-Zn-Ca alloy in simulated body fluid[J]. Transactions of Nonferrous Metals Society of China, 2023 , 33(7) : 2044 -2053 . DOI: 10.1016/S1003-6326(23)66242-9

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