Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid
The real physiological environment of the human body is complicated, with different degrees and forms of loads applied to biomedical implants caused by the daily life of the patients, which will definitely influence the degradation behaviors of Mg-based biodegradable implants. In the present study,...
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MDPI AG
2023-01-01
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| Series: | Journal of Functional Biomaterials |
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| Online Access: | https://www.mdpi.com/2079-4983/14/2/71 |
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| author | Bowen Wang Wei Gao Chao Pan Debao Liu Xiaohao Sun |
| author_facet | Bowen Wang Wei Gao Chao Pan Debao Liu Xiaohao Sun |
| author_sort | Bowen Wang |
| collection | DOAJ |
| description | The real physiological environment of the human body is complicated, with different degrees and forms of loads applied to biomedical implants caused by the daily life of the patients, which will definitely influence the degradation behaviors of Mg-based biodegradable implants. In the present study, the degradation behaviors of modified WE43 alloys under the combination of torsional and tensile stress were systematically investigated. Slow strain rate tensile tests revealed that the simulated body fluid (SBF) solution could deteriorate the ultimate tensile stress of WE43 alloy from 210.1 MPa to 169.2 MPa. In the meantime, the fracture surface of the specimens tested in the SBF showed an intergranular corrosion morphology in the marginal region, while the central area appeared not to have been affected by the corrosive media. The bio-degradation performances under the combination of torsional and tensile stressed conditions were much more severe than those under unstressed conditions or single tensile stressed situations. The combination of 40 MPa tensile and 40 MPa torsional stress resulted in a degradation rate over 20 mm/y, which was much higher than those under 80 MPa single tensile stress (4.5 mm/y) or 80 MPa single torsional stress (13.1 mm/y). The dynamic formation and destruction mechanism of the protective corrosion products film on the modified WE43 alloy could attribute to the exacerbated degradation performance and the unique corrosion morphology. The dynamic environment and multi-directional loading could severely accelerate the degradation process of modified WE43 alloy. Therefore, the SCC susceptibility derived from a single directional test may be not suitable for practical purposes. Complex external stress was necessary to simulate the in vivo environment for the development of biodegradable Mg-based implants for clinical applications. |
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| institution | Directory Open Access Journal |
| issn | 2079-4983 |
| language | English |
| last_indexed | 2024-03-11T08:37:13Z |
| publishDate | 2023-01-01 |
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| series | Journal of Functional Biomaterials |
| spelling | doaj.art-d868f0011e954c6ea72be9c1b62d947a2023-11-16T21:24:16ZengMDPI AGJournal of Functional Biomaterials2079-49832023-01-011427110.3390/jfb14020071Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body FluidBowen Wang0Wei Gao1Chao Pan2Debao Liu3Xiaohao Sun4School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, ChinaSchool of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, ChinaBeijing Chunlizhengda Medical Instruments Co., Ltd., Beijing 300384, ChinaNational Demonstration Center for Experimental Function Materials Education, Tianjin University of Technology, Tianjin 300384, ChinaTianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin 300384, ChinaThe real physiological environment of the human body is complicated, with different degrees and forms of loads applied to biomedical implants caused by the daily life of the patients, which will definitely influence the degradation behaviors of Mg-based biodegradable implants. In the present study, the degradation behaviors of modified WE43 alloys under the combination of torsional and tensile stress were systematically investigated. Slow strain rate tensile tests revealed that the simulated body fluid (SBF) solution could deteriorate the ultimate tensile stress of WE43 alloy from 210.1 MPa to 169.2 MPa. In the meantime, the fracture surface of the specimens tested in the SBF showed an intergranular corrosion morphology in the marginal region, while the central area appeared not to have been affected by the corrosive media. The bio-degradation performances under the combination of torsional and tensile stressed conditions were much more severe than those under unstressed conditions or single tensile stressed situations. The combination of 40 MPa tensile and 40 MPa torsional stress resulted in a degradation rate over 20 mm/y, which was much higher than those under 80 MPa single tensile stress (4.5 mm/y) or 80 MPa single torsional stress (13.1 mm/y). The dynamic formation and destruction mechanism of the protective corrosion products film on the modified WE43 alloy could attribute to the exacerbated degradation performance and the unique corrosion morphology. The dynamic environment and multi-directional loading could severely accelerate the degradation process of modified WE43 alloy. Therefore, the SCC susceptibility derived from a single directional test may be not suitable for practical purposes. Complex external stress was necessary to simulate the in vivo environment for the development of biodegradable Mg-based implants for clinical applications.https://www.mdpi.com/2079-4983/14/2/71degradation behaviormagnesium alloystress-corrosion crackingtensile loadingtorsional loading |
| spellingShingle | Bowen Wang Wei Gao Chao Pan Debao Liu Xiaohao Sun Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid Journal of Functional Biomaterials degradation behavior magnesium alloy stress-corrosion cracking tensile loading torsional loading |
| title | Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid |
| title_full | Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid |
| title_fullStr | Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid |
| title_full_unstemmed | Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid |
| title_short | Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid |
| title_sort | effect of the combination of torsional and tensile stress on corrosion behaviors of biodegradable we43 alloy in simulated body fluid |
| topic | degradation behavior magnesium alloy stress-corrosion cracking tensile loading torsional loading |
| url | https://www.mdpi.com/2079-4983/14/2/71 |
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