Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si
In order to fabricate fibrous eutectic Si, the selective etching of industrial Al–Si eutectic alloys directionally solidified at different growth rates and modified by different amounts of Sr was studied. Flake eutectic and fibrous Si were obtained by selective etching of non-modified, Sr-modified o...
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MDPI AG
2021-12-01
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| author | Jianjun Gao Wei Gu Fenfei Zhang Haibin Geng Jianhua Zhong Ligang Yao Zhilong Zhao Junning Wang |
| author_facet | Jianjun Gao Wei Gu Fenfei Zhang Haibin Geng Jianhua Zhong Ligang Yao Zhilong Zhao Junning Wang |
| author_sort | Jianjun Gao |
| collection | DOAJ |
| description | In order to fabricate fibrous eutectic Si, the selective etching of industrial Al–Si eutectic alloys directionally solidified at different growth rates and modified by different amounts of Sr was studied. Flake eutectic and fibrous Si were obtained by selective etching of non-modified, Sr-modified or directionally solidified Al–Si eutectic alloys. The optimal amount of Sr for fabricating branching eutectic Si was 0.04–0.07%. Through directional solidification with a high enough growth rate (more than 200 μm/s), lamellar eutectic Si transforms to fibrous eutectic Si for use in non-modified Al–Si eutectic alloys. The potentiodynamic polarization and cyclic voltammetry methods were used to test the corrosion behavior of non-modified and Sr-modified Al–Si eutectic alloys. With a constant potential of 0.5 V in HCl solution, non-modified Al–Si eutectic alloys displayed initial pitting corrosion and subsequent spalling corrosion, and 0.04% Sr-modified samples displayed uniform pitting corrosion. Compared with non-modified Al–Si eutectic alloys, Sr-modified samples displayed better corrosion resistance with lower current density and shallower pit depth during the same etching conditions. |
| first_indexed | 2024-03-10T03:34:31Z |
| format | Article |
| id | doaj.art-b80ae1473656427fa430bfcda469dc31 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:34:31Z |
| publishDate | 2021-12-01 |
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| series | Metals |
| spelling | doaj.art-b80ae1473656427fa430bfcda469dc312023-11-23T09:33:42ZengMDPI AGMetals2075-47012021-12-011112197410.3390/met11121974Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic SiJianjun Gao0Wei Gu1Fenfei Zhang2Haibin Geng3Jianhua Zhong4Ligang Yao5Zhilong Zhao6Junning Wang7School of Mechanical Engineering and Automation, Fuzhou University, Fu Zhou 350108, ChinaThinker Agricultural Machinery Co., Ltd., Hu Zhou 313000, ChinaThinker Agricultural Machinery Co., Ltd., Hu Zhou 313000, ChinaSchool of Mechanical Engineering and Automation, Fuzhou University, Fu Zhou 350108, ChinaSchool of Mechanical Engineering and Automation, Fuzhou University, Fu Zhou 350108, ChinaSchool of Mechanical Engineering and Automation, Fuzhou University, Fu Zhou 350108, ChinaSchool of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, ChinaXi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, ChinaIn order to fabricate fibrous eutectic Si, the selective etching of industrial Al–Si eutectic alloys directionally solidified at different growth rates and modified by different amounts of Sr was studied. Flake eutectic and fibrous Si were obtained by selective etching of non-modified, Sr-modified or directionally solidified Al–Si eutectic alloys. The optimal amount of Sr for fabricating branching eutectic Si was 0.04–0.07%. Through directional solidification with a high enough growth rate (more than 200 μm/s), lamellar eutectic Si transforms to fibrous eutectic Si for use in non-modified Al–Si eutectic alloys. The potentiodynamic polarization and cyclic voltammetry methods were used to test the corrosion behavior of non-modified and Sr-modified Al–Si eutectic alloys. With a constant potential of 0.5 V in HCl solution, non-modified Al–Si eutectic alloys displayed initial pitting corrosion and subsequent spalling corrosion, and 0.04% Sr-modified samples displayed uniform pitting corrosion. Compared with non-modified Al–Si eutectic alloys, Sr-modified samples displayed better corrosion resistance with lower current density and shallower pit depth during the same etching conditions.https://www.mdpi.com/2075-4701/11/12/1974eutectic SiSr modificationdirectional solidificationselective etching |
| spellingShingle | Jianjun Gao Wei Gu Fenfei Zhang Haibin Geng Jianhua Zhong Ligang Yao Zhilong Zhao Junning Wang Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si Metals eutectic Si Sr modification directional solidification selective etching |
| title | Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si |
| title_full | Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si |
| title_fullStr | Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si |
| title_full_unstemmed | Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si |
| title_short | Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si |
| title_sort | selective etching of sr modified and directionally solidified industrial al si eutectic alloys for fabricating fibrous eutectic si |
| topic | eutectic Si Sr modification directional solidification selective etching |
| url | https://www.mdpi.com/2075-4701/11/12/1974 |
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