Enhancing corrosion resistance of Al alloy sheets with potential gradient by arc-sprayed Zn coatings
To improve the corrosion resistance and wide the application of Al alloy sheet in the engineering production, a corrosion potential gradient along the thickness of the Al alloy sheet was fabricated using the sprayed Zn layer. The process of arc spraying was employed to obtain the Zn coating with opt...
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| Language: | English |
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424025547 |
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| author | Zhipeng Yuan Yuanlong Jiang Yifan Lu Keyuan Zhang Huanjian Xie Zenglei Ni Liang Huang Jia Liu Xingxing Wang Jin Peng Zicheng Ling Jianjun Shi Peng He |
| author_facet | Zhipeng Yuan Yuanlong Jiang Yifan Lu Keyuan Zhang Huanjian Xie Zenglei Ni Liang Huang Jia Liu Xingxing Wang Jin Peng Zicheng Ling Jianjun Shi Peng He |
| author_sort | Zhipeng Yuan |
| collection | DOAJ |
| description | To improve the corrosion resistance and wide the application of Al alloy sheet in the engineering production, a corrosion potential gradient along the thickness of the Al alloy sheet was fabricated using the sprayed Zn layer. The process of arc spraying was employed to obtain the Zn coating with optimizing the parameters. Electrochemical testing was conducted on the surface of Al alloy sprayed with Zn layers at different depths. As the depth in the thickness direction increases, the content of Zn alloy elements gradually decreases and the potential gradually increases. This exhibits a gradual decrease in corrosion tendency. The results of electrochemical impedance spectra (EIS) revealed the existence of pitting corrosion on the surface of the Al alloy. This even extended to the underlying substrate material. In contrast, the Zn coating, when exposed to a corrosive environment, demonstrated the beneficial cathodic effect as a sacrificial anode and the protective function of a passivating film, thus mitigating corrosion. The gradual increase in charge transfer resistance in the impedance spectrum suggested that the corrosion resistance of the sample is increasingly improved. Therefore, it exhibited remarkable resistance to corrosion. Additionally, the SEM surface morphology and XRD pattern were utilized to further explain the corrosion mechanism of the arc-sprayed Zn coating. The Zn coating can provide sacrificial protection to the Al layer due to its higher negative potential and localized corrosion reactivity. This is attributed to the micro-galvanic couples formed between the Zn and Al layer, thus increasing the corrosion resistance of the sheets. |
| format | Article |
| id | doaj-art-2ab11e5ddb5d4e61aa14fc61a5d3f96c |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-2ab11e5ddb5d4e61aa14fc61a5d3f96c2024-12-26T08:55:18ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013362636274Enhancing corrosion resistance of Al alloy sheets with potential gradient by arc-sprayed Zn coatingsZhipeng Yuan0Yuanlong Jiang1Yifan Lu2Keyuan Zhang3Huanjian Xie4Zenglei Ni5Liang Huang6Jia Liu7Xingxing Wang8Jin Peng9Zicheng Ling10Jianjun Shi11Peng He12School of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, ChinaSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, ChinaSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, ChinaSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, ChinaSchool of Intelligent Manufacturing, Huanghuai University, Zhumadian, 463000, ChinaSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, China; Corresponding author.School of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, ChinaResearch and Innovation Sector, Sokaris Ingenierie, Villeurbanne, 69300, FranceSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, China; Corresponding author.School of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, ChinaSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, ChinaSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450040, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, ChinaTo improve the corrosion resistance and wide the application of Al alloy sheet in the engineering production, a corrosion potential gradient along the thickness of the Al alloy sheet was fabricated using the sprayed Zn layer. The process of arc spraying was employed to obtain the Zn coating with optimizing the parameters. Electrochemical testing was conducted on the surface of Al alloy sprayed with Zn layers at different depths. As the depth in the thickness direction increases, the content of Zn alloy elements gradually decreases and the potential gradually increases. This exhibits a gradual decrease in corrosion tendency. The results of electrochemical impedance spectra (EIS) revealed the existence of pitting corrosion on the surface of the Al alloy. This even extended to the underlying substrate material. In contrast, the Zn coating, when exposed to a corrosive environment, demonstrated the beneficial cathodic effect as a sacrificial anode and the protective function of a passivating film, thus mitigating corrosion. The gradual increase in charge transfer resistance in the impedance spectrum suggested that the corrosion resistance of the sample is increasingly improved. Therefore, it exhibited remarkable resistance to corrosion. Additionally, the SEM surface morphology and XRD pattern were utilized to further explain the corrosion mechanism of the arc-sprayed Zn coating. The Zn coating can provide sacrificial protection to the Al layer due to its higher negative potential and localized corrosion reactivity. This is attributed to the micro-galvanic couples formed between the Zn and Al layer, thus increasing the corrosion resistance of the sheets.http://www.sciencedirect.com/science/article/pii/S2238785424025547CoatingArc spraying ZnMicrostructureCorrosion behaviorElectrochemical impedance spectra |
| spellingShingle | Zhipeng Yuan Yuanlong Jiang Yifan Lu Keyuan Zhang Huanjian Xie Zenglei Ni Liang Huang Jia Liu Xingxing Wang Jin Peng Zicheng Ling Jianjun Shi Peng He Enhancing corrosion resistance of Al alloy sheets with potential gradient by arc-sprayed Zn coatings Journal of Materials Research and Technology Coating Arc spraying Zn Microstructure Corrosion behavior Electrochemical impedance spectra |
| title | Enhancing corrosion resistance of Al alloy sheets with potential gradient by arc-sprayed Zn coatings |
| title_full | Enhancing corrosion resistance of Al alloy sheets with potential gradient by arc-sprayed Zn coatings |
| title_fullStr | Enhancing corrosion resistance of Al alloy sheets with potential gradient by arc-sprayed Zn coatings |
| title_full_unstemmed | Enhancing corrosion resistance of Al alloy sheets with potential gradient by arc-sprayed Zn coatings |
| title_short | Enhancing corrosion resistance of Al alloy sheets with potential gradient by arc-sprayed Zn coatings |
| title_sort | enhancing corrosion resistance of al alloy sheets with potential gradient by arc sprayed zn coatings |
| topic | Coating Arc spraying Zn Microstructure Corrosion behavior Electrochemical impedance spectra |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424025547 |
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