The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/AA3003mod/AA4045 laminated composites at different depths
The depth profiling of the element content and precipitation phase distribution of the AA4045/AA3003mod (Al-1.5Mn-0.35Cu alloy)/AA4045 brazed sheets were investigated by optical microscope observation, electron probe microanalysis (EPMA), focused ion beam-scanning transmission electron microscopy (F...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542302464X |
| _version_ | 1797301523001114624 |
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| author | Xiuhua Hu Kunyuan Gao Xiangyuan Xiong Yusheng Ding Xiaojun Zhang Wu Wei Zuoren Nie Zhenming Yang Dejing Zhou |
| author_facet | Xiuhua Hu Kunyuan Gao Xiangyuan Xiong Yusheng Ding Xiaojun Zhang Wu Wei Zuoren Nie Zhenming Yang Dejing Zhou |
| author_sort | Xiuhua Hu |
| collection | DOAJ |
| description | The depth profiling of the element content and precipitation phase distribution of the AA4045/AA3003mod (Al-1.5Mn-0.35Cu alloy)/AA4045 brazed sheets were investigated by optical microscope observation, electron probe microanalysis (EPMA), focused ion beam-scanning transmission electron microscopy (FIB-STEM). The electrochemical test and sea water acetic acid test (SWAAT) were performed to obtain the evolution of electrochemical responses and corrosion forms of brazed sheet. EPMA results showed that a diffusion layer with the thickness of approximately 50 μm existed between the clad layer and core layer, where the Cu diffused from the core layer and Si diffused from the clad layer. It was found that brazing led to a significant low elements solid solution area at the end of the Si diffusion path, where the open circuit potential was lower by 25 mV comparing to the unaffected region. Thus the diffusion zone can provide effective cathodic protection to the unaffected region as sacrificial anode by the potential gradient. The SWAAT analysis revealed the corrosion mechanism of the residual cladding was pitting and intergranular corrosion. This area with high density of intermetallic compounds and Si particles increased sensitivity to localized attacks. These results demonstrated the successful application of the FIB-STEM system in illustrating the electrochemical responses and corrosion propagation by an accurate in-depth characterization of intermetallic particles and the matrix solid solution. |
| first_indexed | 2024-03-07T23:23:48Z |
| format | Article |
| id | doaj.art-683e0565a2c8492e84be748f9564f298 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:23:48Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-683e0565a2c8492e84be748f9564f2982024-02-21T05:25:43ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012711901199The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/AA3003mod/AA4045 laminated composites at different depthsXiuhua Hu0Kunyuan Gao1Xiangyuan Xiong2Yusheng Ding3Xiaojun Zhang4Wu Wei5Zuoren Nie6Zhenming Yang7Dejing Zhou8College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, China; Corresponding author.College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, ChinaYin Bang Clad Material Co., Ltd., Jiangsu Key Laboratory for Clad Materials, Wuxi 214145, ChinaYin Bang Clad Material Co., Ltd., Jiangsu Key Laboratory for Clad Materials, Wuxi 214145, ChinaThe depth profiling of the element content and precipitation phase distribution of the AA4045/AA3003mod (Al-1.5Mn-0.35Cu alloy)/AA4045 brazed sheets were investigated by optical microscope observation, electron probe microanalysis (EPMA), focused ion beam-scanning transmission electron microscopy (FIB-STEM). The electrochemical test and sea water acetic acid test (SWAAT) were performed to obtain the evolution of electrochemical responses and corrosion forms of brazed sheet. EPMA results showed that a diffusion layer with the thickness of approximately 50 μm existed between the clad layer and core layer, where the Cu diffused from the core layer and Si diffused from the clad layer. It was found that brazing led to a significant low elements solid solution area at the end of the Si diffusion path, where the open circuit potential was lower by 25 mV comparing to the unaffected region. Thus the diffusion zone can provide effective cathodic protection to the unaffected region as sacrificial anode by the potential gradient. The SWAAT analysis revealed the corrosion mechanism of the residual cladding was pitting and intergranular corrosion. This area with high density of intermetallic compounds and Si particles increased sensitivity to localized attacks. These results demonstrated the successful application of the FIB-STEM system in illustrating the electrochemical responses and corrosion propagation by an accurate in-depth characterization of intermetallic particles and the matrix solid solution.http://www.sciencedirect.com/science/article/pii/S223878542302464XBrazed sheetDiffusionBand of dense precipitatesSolid solutionCorrosion |
| spellingShingle | Xiuhua Hu Kunyuan Gao Xiangyuan Xiong Yusheng Ding Xiaojun Zhang Wu Wei Zuoren Nie Zhenming Yang Dejing Zhou The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/AA3003mod/AA4045 laminated composites at different depths Journal of Materials Research and Technology Brazed sheet Diffusion Band of dense precipitates Solid solution Corrosion |
| title | The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/AA3003mod/AA4045 laminated composites at different depths |
| title_full | The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/AA3003mod/AA4045 laminated composites at different depths |
| title_fullStr | The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/AA3003mod/AA4045 laminated composites at different depths |
| title_full_unstemmed | The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/AA3003mod/AA4045 laminated composites at different depths |
| title_short | The influence of microstructure on corrosion mechanism for brazed sheet of AA4045/AA3003mod/AA4045 laminated composites at different depths |
| title_sort | influence of microstructure on corrosion mechanism for brazed sheet of aa4045 aa3003mod aa4045 laminated composites at different depths |
| topic | Brazed sheet Diffusion Band of dense precipitates Solid solution Corrosion |
| url | http://www.sciencedirect.com/science/article/pii/S223878542302464X |
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