Corrosion mechanism of the Ti–6Al–4V/AA6061 dissimilar metal CMT welded joint
Ti–Al composites are increasingly used in aviation for their lightweight, strength, and corrosion resistance. This study investigates the microstructural influence on the corrosion performance of Ti/Al Cold Metal Transfer welded joints by X-ray Photoelectron Ppectroscopy (XPS), Local Electrochemical...
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| Language: | English |
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425005551 |
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| author | Hao Xu Rui Cao Xianglong Ma Yingjie Yan Ding Fan Hongbiao Dong |
| author_facet | Hao Xu Rui Cao Xianglong Ma Yingjie Yan Ding Fan Hongbiao Dong |
| author_sort | Hao Xu |
| collection | DOAJ |
| description | Ti–Al composites are increasingly used in aviation for their lightweight, strength, and corrosion resistance. This study investigates the microstructural influence on the corrosion performance of Ti/Al Cold Metal Transfer welded joints by X-ray Photoelectron Ppectroscopy (XPS), Local Electrochemical Impedance Spectroscopy (LEIS), and Scanning Kelvin Probe Force Microscopy (SKPFM). The results indicate that, due to the inhomogeneity of the microstructure, the corrosion primarily occurs in the aluminum base metal (Al-BM) and the weld metal (WM), causing pitting and accumulation of corrosion products (Al2O3, Al(OH)3, and AlO(OH)). The Ti (Al, Si)3 IMC layer disrupted the continuity of the interfacial microstructure in the Ti/WM region. Due to the synergistic effect of both macroscopic and microscopic galvanic corrosion, a strong coupled current density was generated at the interface, leading to severe corrosion. Additionally, the experimental results were also mathematically validated using general theoretical expressions for potential and current. The corrosion process of the WM and Al-BM regions consists of three stages: passive film formation, selective dissolution, and depth propagation. These findings improve our understanding of Ti/Al joint corrosion behavior and provide theoretical support for improving corrosion resistance and extending service life. |
| format | Article |
| id | doaj-art-e8a4ec3ebebe4b9e84e11789496e664f |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-e8a4ec3ebebe4b9e84e11789496e664f2025-08-20T01:58:27ZengElsevierJournal of Materials Research and Technology2238-78542025-03-01356951696410.1016/j.jmrt.2025.03.045Corrosion mechanism of the Ti–6Al–4V/AA6061 dissimilar metal CMT welded jointHao Xu0Rui Cao1Xianglong Ma2Yingjie Yan3Ding Fan4Hongbiao Dong5State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, ChinaState Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China; Department of Engineering, University of Leicester, LE1 7RH, UK; Corresponding author. Langongping 287 Road, Qilihe District, 730050, China.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, ChinaState Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, ChinaState Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, ChinaDepartment of Engineering, University of Leicester, LE1 7RH, UK; Corresponding author.Ti–Al composites are increasingly used in aviation for their lightweight, strength, and corrosion resistance. This study investigates the microstructural influence on the corrosion performance of Ti/Al Cold Metal Transfer welded joints by X-ray Photoelectron Ppectroscopy (XPS), Local Electrochemical Impedance Spectroscopy (LEIS), and Scanning Kelvin Probe Force Microscopy (SKPFM). The results indicate that, due to the inhomogeneity of the microstructure, the corrosion primarily occurs in the aluminum base metal (Al-BM) and the weld metal (WM), causing pitting and accumulation of corrosion products (Al2O3, Al(OH)3, and AlO(OH)). The Ti (Al, Si)3 IMC layer disrupted the continuity of the interfacial microstructure in the Ti/WM region. Due to the synergistic effect of both macroscopic and microscopic galvanic corrosion, a strong coupled current density was generated at the interface, leading to severe corrosion. Additionally, the experimental results were also mathematically validated using general theoretical expressions for potential and current. The corrosion process of the WM and Al-BM regions consists of three stages: passive film formation, selective dissolution, and depth propagation. These findings improve our understanding of Ti/Al joint corrosion behavior and provide theoretical support for improving corrosion resistance and extending service life.http://www.sciencedirect.com/science/article/pii/S2238785425005551Titanium alloy/aluminum alloy dissimilar jointGalvanic corrosionLocal electrochemical impedance spectroscopy (LEIS)Scanning kelvin probe force microscopy (SKPFM) |
| spellingShingle | Hao Xu Rui Cao Xianglong Ma Yingjie Yan Ding Fan Hongbiao Dong Corrosion mechanism of the Ti–6Al–4V/AA6061 dissimilar metal CMT welded joint Journal of Materials Research and Technology Titanium alloy/aluminum alloy dissimilar joint Galvanic corrosion Local electrochemical impedance spectroscopy (LEIS) Scanning kelvin probe force microscopy (SKPFM) |
| title | Corrosion mechanism of the Ti–6Al–4V/AA6061 dissimilar metal CMT welded joint |
| title_full | Corrosion mechanism of the Ti–6Al–4V/AA6061 dissimilar metal CMT welded joint |
| title_fullStr | Corrosion mechanism of the Ti–6Al–4V/AA6061 dissimilar metal CMT welded joint |
| title_full_unstemmed | Corrosion mechanism of the Ti–6Al–4V/AA6061 dissimilar metal CMT welded joint |
| title_short | Corrosion mechanism of the Ti–6Al–4V/AA6061 dissimilar metal CMT welded joint |
| title_sort | corrosion mechanism of the ti 6al 4v aa6061 dissimilar metal cmt welded joint |
| topic | Titanium alloy/aluminum alloy dissimilar joint Galvanic corrosion Local electrochemical impedance spectroscopy (LEIS) Scanning kelvin probe force microscopy (SKPFM) |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425005551 |
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