Influence of Aging Temperature on the Electrochemical Corrosion Behavior of an Age-Hardening 7xxx Aluminum Alloy
In this paper, the microstructure changes of an Al–6.8Zn–2Mg–2Cu–0.1Zr–0.2Sc alloy for shipbuilding under different T6 states were investigated. The effect of aging temperature on the electrochemical corrosion behavior of the alloy was analyzed by means of SEM, EDS, and TEM, and the corrosion mechan...
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MDPI AG
2025-01-01
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| author | Boqian Cai Xiaolong Liu Yang Yi Hongyang Li Fanian Shi |
| author_facet | Boqian Cai Xiaolong Liu Yang Yi Hongyang Li Fanian Shi |
| author_sort | Boqian Cai |
| collection | DOAJ |
| description | In this paper, the microstructure changes of an Al–6.8Zn–2Mg–2Cu–0.1Zr–0.2Sc alloy for shipbuilding under different T6 states were investigated. The effect of aging temperature on the electrochemical corrosion behavior of the alloy was analyzed by means of SEM, EDS, and TEM, and the corrosion mechanism was revealed. The results show that the bean-shaped Al<sub>3</sub>(Sc, Zr) phase is formed in the T6 alloy. The matrix-precipitated phase is mainly the GP zone at 120 °C. At 150 °C, part of the GP zone is transformed into the η′ phase, and at 180 °C, it is mainly η′ phase + η phase. After electrochemical testing in a 3.5 wt.% NaCl solution, it was found that the Cu content in the grain boundary η phase increased with the increase in aging temperature, the potential near the grain boundary increased, and the corrosion resistance increased. At the same time, the grain boundary precipitates were coarsened and distributed intermittently, which hindered the formation of corrosion channels and improved the corrosion resistance of the alloy. The corrosion mechanism of the alloy after aging at 120 °C/150 °C was mainly intergranular corrosion and pitting corrosion, while the corrosion mechanism after aging at 180 °C was mainly pitting corrosion. |
| format | Article |
| id | doaj-art-03c75a66cc7d45dbaee9b9e3304f80f5 |
| institution | DOAJ |
| issn | 2073-4352 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj-art-03c75a66cc7d45dbaee9b9e3304f80f52025-08-20T03:12:18ZengMDPI AGCrystals2073-43522025-01-0115210710.3390/cryst15020107Influence of Aging Temperature on the Electrochemical Corrosion Behavior of an Age-Hardening 7xxx Aluminum AlloyBoqian Cai0Xiaolong Liu1Yang Yi2Hongyang Li3Fanian Shi4School of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaShenyang Xinghua Aviation Electrical Co., Ltd., AVIC, Shenyang 110144, ChinaSchool of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaIn this paper, the microstructure changes of an Al–6.8Zn–2Mg–2Cu–0.1Zr–0.2Sc alloy for shipbuilding under different T6 states were investigated. The effect of aging temperature on the electrochemical corrosion behavior of the alloy was analyzed by means of SEM, EDS, and TEM, and the corrosion mechanism was revealed. The results show that the bean-shaped Al<sub>3</sub>(Sc, Zr) phase is formed in the T6 alloy. The matrix-precipitated phase is mainly the GP zone at 120 °C. At 150 °C, part of the GP zone is transformed into the η′ phase, and at 180 °C, it is mainly η′ phase + η phase. After electrochemical testing in a 3.5 wt.% NaCl solution, it was found that the Cu content in the grain boundary η phase increased with the increase in aging temperature, the potential near the grain boundary increased, and the corrosion resistance increased. At the same time, the grain boundary precipitates were coarsened and distributed intermittently, which hindered the formation of corrosion channels and improved the corrosion resistance of the alloy. The corrosion mechanism of the alloy after aging at 120 °C/150 °C was mainly intergranular corrosion and pitting corrosion, while the corrosion mechanism after aging at 180 °C was mainly pitting corrosion.https://www.mdpi.com/2073-4352/15/2/107age-hardening aluminum alloyAl–6.8Zn–2Mg–2Cu–0.1Zr–0.2Scaging temperatureelectrochemical corrosion behavior |
| spellingShingle | Boqian Cai Xiaolong Liu Yang Yi Hongyang Li Fanian Shi Influence of Aging Temperature on the Electrochemical Corrosion Behavior of an Age-Hardening 7xxx Aluminum Alloy Crystals age-hardening aluminum alloy Al–6.8Zn–2Mg–2Cu–0.1Zr–0.2Sc aging temperature electrochemical corrosion behavior |
| title | Influence of Aging Temperature on the Electrochemical Corrosion Behavior of an Age-Hardening 7xxx Aluminum Alloy |
| title_full | Influence of Aging Temperature on the Electrochemical Corrosion Behavior of an Age-Hardening 7xxx Aluminum Alloy |
| title_fullStr | Influence of Aging Temperature on the Electrochemical Corrosion Behavior of an Age-Hardening 7xxx Aluminum Alloy |
| title_full_unstemmed | Influence of Aging Temperature on the Electrochemical Corrosion Behavior of an Age-Hardening 7xxx Aluminum Alloy |
| title_short | Influence of Aging Temperature on the Electrochemical Corrosion Behavior of an Age-Hardening 7xxx Aluminum Alloy |
| title_sort | influence of aging temperature on the electrochemical corrosion behavior of an age hardening 7xxx aluminum alloy |
| topic | age-hardening aluminum alloy Al–6.8Zn–2Mg–2Cu–0.1Zr–0.2Sc aging temperature electrochemical corrosion behavior |
| url | https://www.mdpi.com/2073-4352/15/2/107 |
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