Effect of Cold-Spray Treatment on Surface Properties of AZ80 Magnesium Alloy
| Autor: | Ya-Ju Lee, 李雅茹 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 It is commonly recognized that magnesium possesses poor corrosion resistance because of its high oxidation potential and porous oxide structure. The corrosion resistance is the most important topic for magnesium alloys application. The thesis aims to investigate how cold spray influences the properties of magnesium alloy, including microstructure, mechanical and corrosion property. The sprayed substrate is AZ80 magnesium alloy. IN625, 301 stainless steel and aluminum powder is used to spraying on the surface. In the study, the coating formed by cold spray treatment has some holes, and is a non-dense film. AZ80 substrate occurred grain refinement after spray IN625 and 301 stainless steel process. For the aluminum coating, it was observed that after coating process, substrate surface is obviously harder than after coating IN625 process. As to the corrosion behavior, the result of the potential-dynamic polarization curve tests reveals that, whether in the IN625 or the Al coating, the corrosion resistance are better than magnesium substrate. In the wear and erosion test, the cold spray coating are to improve the wear and erosion resistance of AZ80 magnesium alloy. After annealing, the AZ80 alloy interacts with Al coating to form Mg17Al12 and Al3Mg2 compound at the interface. After anodizing, on the aluminum coating surface formed a high hardness alumina layer that has excellent corrosion resistance than aluminum coating. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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