One-step hydrothermal synthesis of 2,5-PDCA-containing MgAl-LDHs three-layer composite coating with high corrosion resistance on AZ31
The addition of 2,5-pyridinedicarboxylic acid (2,5-PDCA) to the Mg-Al LDH coating, which was prepared by one-step hydrothermal synthesis, had extremely enhanced the corrosion protection of AZ31 Mg alloy, although the 2,5-PDCA could not be intercalated into the interlayer spacing. The corrosion curre...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2023-07-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956722001244 |
| _version_ | 1797693896506998784 |
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| author | Fan Shi Jingmao Zhao Mohammad Tabish Jingbao Wang Pu Liu Jiayu Chang |
| author_facet | Fan Shi Jingmao Zhao Mohammad Tabish Jingbao Wang Pu Liu Jiayu Chang |
| author_sort | Fan Shi |
| collection | DOAJ |
| description | The addition of 2,5-pyridinedicarboxylic acid (2,5-PDCA) to the Mg-Al LDH coating, which was prepared by one-step hydrothermal synthesis, had extremely enhanced the corrosion protection of AZ31 Mg alloy, although the 2,5-PDCA could not be intercalated into the interlayer spacing. The corrosion current density of 0.05 mol L−1 2,5-PDCA LDH containing LDH coating is 3.18 nA cm−2, reduced by two orders of magnitude compared to the LDH coating without inhibitor, and the corrosion inhibition efficiency of the coating is 98.05%. The coating formed on the surface of AZ31 was peeled off from the substrate by using a mechanical method and SEM observation of the cross-section showed that the coating consisted of three different layers. The innermost layer is a thick layer that consists of Mg(OH)2 and the intermediate layer is LDH, which is vertical to the substrate and the outmost layer is a thin but very dense deposit layer of LDH agglomerates with complexes of 2,5-PDCA and Mg. This kind of sediment/LDH/Mg(OH)2 three-layer composite structure was accountable for the increase in the corrosion resistance of AZ31 Mg alloy. |
| first_indexed | 2024-03-12T02:50:18Z |
| format | Article |
| id | doaj.art-67dd083655ea4480ae2d3b0bb492a416 |
| institution | Directory Open Access Journal |
| issn | 2213-9567 |
| language | English |
| last_indexed | 2024-03-12T02:50:18Z |
| publishDate | 2023-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-67dd083655ea4480ae2d3b0bb492a4162023-09-04T04:10:17ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672023-07-0111725412557One-step hydrothermal synthesis of 2,5-PDCA-containing MgAl-LDHs three-layer composite coating with high corrosion resistance on AZ31Fan Shi0Jingmao Zhao1Mohammad Tabish2Jingbao Wang3Pu Liu4Jiayu Chang5College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaCollege of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing 100029, China; Corresponding author at: College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaCollege of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaCollege of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaCollege of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaThe addition of 2,5-pyridinedicarboxylic acid (2,5-PDCA) to the Mg-Al LDH coating, which was prepared by one-step hydrothermal synthesis, had extremely enhanced the corrosion protection of AZ31 Mg alloy, although the 2,5-PDCA could not be intercalated into the interlayer spacing. The corrosion current density of 0.05 mol L−1 2,5-PDCA LDH containing LDH coating is 3.18 nA cm−2, reduced by two orders of magnitude compared to the LDH coating without inhibitor, and the corrosion inhibition efficiency of the coating is 98.05%. The coating formed on the surface of AZ31 was peeled off from the substrate by using a mechanical method and SEM observation of the cross-section showed that the coating consisted of three different layers. The innermost layer is a thick layer that consists of Mg(OH)2 and the intermediate layer is LDH, which is vertical to the substrate and the outmost layer is a thin but very dense deposit layer of LDH agglomerates with complexes of 2,5-PDCA and Mg. This kind of sediment/LDH/Mg(OH)2 three-layer composite structure was accountable for the increase in the corrosion resistance of AZ31 Mg alloy.http://www.sciencedirect.com/science/article/pii/S2213956722001244Three-layer composite coatingHydrothermal synthesis2,5-PDCAMgAl-LDHsPeeling |
| spellingShingle | Fan Shi Jingmao Zhao Mohammad Tabish Jingbao Wang Pu Liu Jiayu Chang One-step hydrothermal synthesis of 2,5-PDCA-containing MgAl-LDHs three-layer composite coating with high corrosion resistance on AZ31 Journal of Magnesium and Alloys Three-layer composite coating Hydrothermal synthesis 2,5-PDCA MgAl-LDHs Peeling |
| title | One-step hydrothermal synthesis of 2,5-PDCA-containing MgAl-LDHs three-layer composite coating with high corrosion resistance on AZ31 |
| title_full | One-step hydrothermal synthesis of 2,5-PDCA-containing MgAl-LDHs three-layer composite coating with high corrosion resistance on AZ31 |
| title_fullStr | One-step hydrothermal synthesis of 2,5-PDCA-containing MgAl-LDHs three-layer composite coating with high corrosion resistance on AZ31 |
| title_full_unstemmed | One-step hydrothermal synthesis of 2,5-PDCA-containing MgAl-LDHs three-layer composite coating with high corrosion resistance on AZ31 |
| title_short | One-step hydrothermal synthesis of 2,5-PDCA-containing MgAl-LDHs three-layer composite coating with high corrosion resistance on AZ31 |
| title_sort | one step hydrothermal synthesis of 2 5 pdca containing mgal ldhs three layer composite coating with high corrosion resistance on az31 |
| topic | Three-layer composite coating Hydrothermal synthesis 2,5-PDCA MgAl-LDHs Peeling |
| url | http://www.sciencedirect.com/science/article/pii/S2213956722001244 |
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