Comparative study of corrosion behaviors of die cast LA42 and AZ91 alloys
In our previous work, die cast LA42 (Mg–4La–2.5Al–0.3Mn, wt.%) alloy with an excellent combination of thermal-conducting performance and mechanical properties was developed. This study, taking commercial die cast AZ91 (Mg-9Al-1 Zn, wt.%) alloy as a comparison, investigates the microstructure and cor...
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KeAi Communications Co., Ltd.
2025-05-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956722002791 |
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| author | Wenke Zhou Zixin Li Dejiang Li Yuyang Chen Yao Yang Ming Qin Xiaoqin Zeng |
| author_facet | Wenke Zhou Zixin Li Dejiang Li Yuyang Chen Yao Yang Ming Qin Xiaoqin Zeng |
| author_sort | Wenke Zhou |
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| description | In our previous work, die cast LA42 (Mg–4La–2.5Al–0.3Mn, wt.%) alloy with an excellent combination of thermal-conducting performance and mechanical properties was developed. This study, taking commercial die cast AZ91 (Mg-9Al-1 Zn, wt.%) alloy as a comparison, investigates the microstructure and corrosion behavior of the LA42 alloy in chloride-containing environment. The findings revealed that the microstructure of die cast LA42 alloy displays an Al-depleted α-Mg dendrite and a network shape eutectic phase comprising of eutectic α-Mg and lamellar Al11La3. The LA42 alloy exhibited slightly inferior corrosion resistance and deeper corrosion pits than the AZ91 alloy, which were related to the interphase attack and the presence of a layer of corrosion products containing more magnesium hydroxide of the LA42 alloy. The corrosion behavior of the LA42 alloy was characterized by an interphase attack on the periphery of Al-depleted α-Mg dendrite adjacent to Al11La3, which primarily ascribed to the relatively lower potential of the Al-depleted α-Mg phase and the interfacial reactivity between it and the adjacent Al11La3, whereas the AZ91 alloy showed a trait of preferential corrosion of the interior of α-Mg dendrite for its lowest potential among different phases. This comprehensive research can provide a guidance for future alloy design of Mg-Al-La alloys and their industrial applications. |
| format | Article |
| id | doaj-art-de6bd6837b444bc4a7a3bdc3fc6905fa |
| institution | Kabale University |
| issn | 2213-9567 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Journal of Magnesium and Alloys |
| spelling | doaj-art-de6bd6837b444bc4a7a3bdc3fc6905fa2025-08-20T03:31:01ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672025-05-011352036204810.1016/j.jma.2022.10.022Comparative study of corrosion behaviors of die cast LA42 and AZ91 alloysWenke Zhou0Zixin Li1Dejiang Li2Yuyang Chen3Yao Yang4Ming Qin5Xiaoqin Zeng6Hitachi (China) Ltd., Rui Jin Building, No. 205 Maoming Road(S), Shanghai 200020, ChinaNational Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, ChinaNational Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; Corresponding authors at: National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, ChinaNational Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, ChinaHitachi (China) Ltd., Rui Jin Building, No. 205 Maoming Road(S), Shanghai 200020, ChinaNational Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; Corresponding authors at: National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.In our previous work, die cast LA42 (Mg–4La–2.5Al–0.3Mn, wt.%) alloy with an excellent combination of thermal-conducting performance and mechanical properties was developed. This study, taking commercial die cast AZ91 (Mg-9Al-1 Zn, wt.%) alloy as a comparison, investigates the microstructure and corrosion behavior of the LA42 alloy in chloride-containing environment. The findings revealed that the microstructure of die cast LA42 alloy displays an Al-depleted α-Mg dendrite and a network shape eutectic phase comprising of eutectic α-Mg and lamellar Al11La3. The LA42 alloy exhibited slightly inferior corrosion resistance and deeper corrosion pits than the AZ91 alloy, which were related to the interphase attack and the presence of a layer of corrosion products containing more magnesium hydroxide of the LA42 alloy. The corrosion behavior of the LA42 alloy was characterized by an interphase attack on the periphery of Al-depleted α-Mg dendrite adjacent to Al11La3, which primarily ascribed to the relatively lower potential of the Al-depleted α-Mg phase and the interfacial reactivity between it and the adjacent Al11La3, whereas the AZ91 alloy showed a trait of preferential corrosion of the interior of α-Mg dendrite for its lowest potential among different phases. This comprehensive research can provide a guidance for future alloy design of Mg-Al-La alloys and their industrial applications.http://www.sciencedirect.com/science/article/pii/S2213956722002791Micro-galvanic corrosionInterphase corrosionMagnesium alloyMicrostructure |
| spellingShingle | Wenke Zhou Zixin Li Dejiang Li Yuyang Chen Yao Yang Ming Qin Xiaoqin Zeng Comparative study of corrosion behaviors of die cast LA42 and AZ91 alloys Journal of Magnesium and Alloys Micro-galvanic corrosion Interphase corrosion Magnesium alloy Microstructure |
| title | Comparative study of corrosion behaviors of die cast LA42 and AZ91 alloys |
| title_full | Comparative study of corrosion behaviors of die cast LA42 and AZ91 alloys |
| title_fullStr | Comparative study of corrosion behaviors of die cast LA42 and AZ91 alloys |
| title_full_unstemmed | Comparative study of corrosion behaviors of die cast LA42 and AZ91 alloys |
| title_short | Comparative study of corrosion behaviors of die cast LA42 and AZ91 alloys |
| title_sort | comparative study of corrosion behaviors of die cast la42 and az91 alloys |
| topic | Micro-galvanic corrosion Interphase corrosion Magnesium alloy Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2213956722002791 |
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