Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainers
Smart micro-arc oxidation (MAO)/epoxy resin (EP) composite coatings were formed on AZ31 magnesium (Mg) alloy. Mesoporous silica nanocontainers (MSN) encapsulated with sodium benzoate (SB) corrosion inhibitors were strategically incorporated in the MAO micropores and in the top EP layer. The influenc...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-12-01
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| Series: | Journal of Magnesium and Alloys |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956723000105 |
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| author | Ai-meng Zhang Chengbao Liu Pu-sheng Sui Cong Sun Lan-yue Cui M. Bobby Kannan Rong-Chang Zeng |
| author_facet | Ai-meng Zhang Chengbao Liu Pu-sheng Sui Cong Sun Lan-yue Cui M. Bobby Kannan Rong-Chang Zeng |
| author_sort | Ai-meng Zhang |
| collection | DOAJ |
| description | Smart micro-arc oxidation (MAO)/epoxy resin (EP) composite coatings were formed on AZ31 magnesium (Mg) alloy. Mesoporous silica nanocontainers (MSN) encapsulated with sodium benzoate (SB) corrosion inhibitors were strategically incorporated in the MAO micropores and in the top EP layer. The influence of the strategic positioning of the nanocontainers on the corrosion protective performance of coating was investigated. The experimental results and analysis indicated that the superior corrosion resistance of the hybrid coating is ascribed to the protection mechanisms of the nanocontainers. This involves two phenomena: (1) the presence of the nanocontainers in the MAO micropores decreased the distance between MSN@SB and the substrate, demonstrating a low admittance value (∼ 5.18 × 10−8 Ω−1), and thus exhibiting significant corrosion inhibition and self-healing function; and (2) the addition of nanocontainers in the top EP layer densified the coating via sealing of the inherent defects, and hence the coating maintained higher resistance even after 90 days of immersion (1.13 × 1010 Ω cm2). However, the possibility of corrosion inhibitors located away from the substrate transport to the substrate is reduced, reducing its effective utilization rate. This work demonstrates the importance of the positioning of nanocontainers in the coating for enhanced corrosion resistance, and thereby providing a novel perspective for the design of smart protective coatings through regulating the distribution of nanocontainers in the coatings. |
| first_indexed | 2024-03-08T10:31:00Z |
| format | Article |
| id | doaj.art-f49cb77546954195ad10a49ad0d22fd7 |
| institution | Directory Open Access Journal |
| issn | 2213-9567 |
| language | English |
| last_indexed | 2024-03-08T10:31:00Z |
| publishDate | 2023-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-f49cb77546954195ad10a49ad0d22fd72024-01-27T06:54:46ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672023-12-01111245624574Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainersAi-meng Zhang0Chengbao Liu1Pu-sheng Sui2Cong Sun3Lan-yue Cui4M. Bobby Kannan5Rong-Chang Zeng6College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China; Corresponding authors at: College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaSchool of Engineering, University of Newcastle, Callaghan, New South Wales 2308, AustraliaCollege of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China; School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China; Corresponding authors at: College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.Smart micro-arc oxidation (MAO)/epoxy resin (EP) composite coatings were formed on AZ31 magnesium (Mg) alloy. Mesoporous silica nanocontainers (MSN) encapsulated with sodium benzoate (SB) corrosion inhibitors were strategically incorporated in the MAO micropores and in the top EP layer. The influence of the strategic positioning of the nanocontainers on the corrosion protective performance of coating was investigated. The experimental results and analysis indicated that the superior corrosion resistance of the hybrid coating is ascribed to the protection mechanisms of the nanocontainers. This involves two phenomena: (1) the presence of the nanocontainers in the MAO micropores decreased the distance between MSN@SB and the substrate, demonstrating a low admittance value (∼ 5.18 × 10−8 Ω−1), and thus exhibiting significant corrosion inhibition and self-healing function; and (2) the addition of nanocontainers in the top EP layer densified the coating via sealing of the inherent defects, and hence the coating maintained higher resistance even after 90 days of immersion (1.13 × 1010 Ω cm2). However, the possibility of corrosion inhibitors located away from the substrate transport to the substrate is reduced, reducing its effective utilization rate. This work demonstrates the importance of the positioning of nanocontainers in the coating for enhanced corrosion resistance, and thereby providing a novel perspective for the design of smart protective coatings through regulating the distribution of nanocontainers in the coatings.http://www.sciencedirect.com/science/article/pii/S2213956723000105NanocontainersSelf-healing coatingMicro-arc oxidationCorrosion protectionMagnesium alloys |
| spellingShingle | Ai-meng Zhang Chengbao Liu Pu-sheng Sui Cong Sun Lan-yue Cui M. Bobby Kannan Rong-Chang Zeng Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainers Journal of Magnesium and Alloys Nanocontainers Self-healing coating Micro-arc oxidation Corrosion protection Magnesium alloys |
| title | Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainers |
| title_full | Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainers |
| title_fullStr | Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainers |
| title_full_unstemmed | Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainers |
| title_short | Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainers |
| title_sort | corrosion resistance and mechanisms of smart micro arc oxidation epoxy resin coatings on az31 mg alloy strategic positioning of nanocontainers |
| topic | Nanocontainers Self-healing coating Micro-arc oxidation Corrosion protection Magnesium alloys |
| url | http://www.sciencedirect.com/science/article/pii/S2213956723000105 |
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