2021 Fiscal Year Final Research Report
Corrosion behavior of magnesium alloy tubes with several shape types in flow
| Project/Area Number |
19K04095
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | Shibaura Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
山田 隆一 山梨大学, 大学院総合研究部, 助教 (20820989)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | マグネシウム / 腐食 / 変形 / 疲労 / 結晶粒微細化 / 壁面せん断応力 |
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| Outline of Final Research Achievements |
The mass loss and form of corrosion as well as corrosion-prone conditions were clarified by immersion tests of magnesium materials under tensile, compressive, shear (torsion), and multiple heat treatment conditions. In addition, immersion tests of magnesium alloys loaded with cyclic loads and magnesium alloys with grain refinement were also conducted to clarify the corrosion mass loss and corrosion behavior. In addition, several stent shapes were manufactured by laser machining, and corrosion tests were conducted in a fluid flow field to confirm the corrosion susceptibility of the stents and to identify the locations where corrosion occurs. Using CFD fluid analysis in combination with the experimental results, the influence of wall shear stress was also discussed.
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| Free Research Field |
材料力学・材料加工
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| Academic Significance and Societal Importance of the Research Achievements |
体内必須元素のひとつであるマグネシウムは腐食しやすい性質を利用して骨折箇所のプレートや血管狭窄部のステントに使用すれば治癒後摘出手術を行わずに済む利点があります。しかし、マグネシウムの溶ける速度はとても早いため、溶ける速度を制御するニーズがあります。そのために材料に変形を加えたり繰り返し荷重を負荷したり、諸条件から純マグネシウムやマグネシウム合金の特性を実験によって把握することができました。また、実際に、マグネシウム合金管を用いてレーザーによってステント形状にして流体を流すと、一様に腐食することはなく、腐食しやすい場所などがわかりました。これらの理由をシミュレーションによって確認も行いました。
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