| Epoxy-based bi-layer self-repairing coating with anti-corrosive functionalities for the protection of A2024 aluminum alloy | |
| Njoku, Chigoziri N.1,2,3; Bai, Weichen1,4; Meng, Meijiang1; Arukalam, Innocent O.1,5; Njoku, Demian I.1; Li, Ying1,6 | |
| Corresponding Author | Njoku, Demian I.(demian@imr.ac.cn) ; Li, Ying(liying@imr.ac.cn) |
| 2019-11-01 | |
| Source Publication | MATERIALS RESEARCH EXPRESS
 |
| ISSN | 2053-1591 |
| Volume | 6Issue:11Pages:16 |
| Abstract | A bi-layer epoxy-based coating for effective multifunctional protective action on aluminum alloy A2024 is fabricated. The primer layer is a smart coat embedded with microcapsule laden with 8-Hydroxyquinoline (8-HQ) inhibitor, while the top layer is a self-repairing coating embedded with microcapsule laden with maleic anhydride (MA). The microcapsules were synthesized by in situ polymerization. The morphology of the capsules reveal a relatively rough outer surface and mean sizes of 3.02 +/- 0.4 mu m and 5.4 +/- 1.5 mu m for MA and 8-HQ encapsulations, respectively. Also, the core loading amounts are 45 wt% for MA and 50 wt% for 8-HQ. Spectroscopic and impedance measurements revealed that the modified epoxy bi-layer coating demonstrates better corrosion protection than the unmodified epoxy coating on the aluminum alloy. This is ascribed to the combined effects of the mechanical response release of the encapsulated MA embedded in the top layer coat at defective sites which initiated self-repairing action during outdoor exposure, and the pH-responsive release of encapsulated 8-HQ in the primer layer coat during exposure in 3.5% NaCl solution. Scanning electron microscopy (SEM) results confirmed the self-repairing property of the top layer coating after 30 days of salt spray test. Physical tests reveal that the modified bi-layer coating showed better adhesion strength on the aluminum substrate even after 180 days of outdoor exposure. |
| Keyword | aluminum AA2024 alloy microcapsule bi-layer epoxy coating self-repairing coating |
| Funding Organization | National Natural Science Fund of China ; Institute of Metal Research ; University of Chinese Academy of Sciences (UCAS) |
| DOI | 10.1088/2053-1591/ab485b |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Fund of China[51871227] ; National Natural Science Fund of China[51650110506] ; Institute of Metal Research ; University of Chinese Academy of Sciences (UCAS) |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Multidisciplinary |
| WOS ID | WOS:000504243700002 |
| Publisher | IOP PUBLISHING LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/136531 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Njoku, Demian I.; Li, Ying |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Corros & Protect Div, 62 Wencui Rd, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China 3.Fed Univ Technol Owerri, Dept Chem Engn, PMB 1526, Owerri, Nigeria 4.Univ Sci & Technol China, Sch Mat Sci & Technol, 96 Jin Zhai Rd, Hefei 230026, Anhui, Peoples R China 5.Fed Univ Technol Owerri, Dept Polymer & Text Engn, PMB 1526, Owerri, Nigeria 6.Northeastern Univ, Shenyang Natl Lab Mat Sci, 3-11 Wenhua Rd, Shenyang 110819, Liaoning, Peoples R China |
| Recommended Citation GB/T 7714 | Njoku, Chigoziri N.,Bai, Weichen,Meng, Meijiang,et al. Epoxy-based bi-layer self-repairing coating with anti-corrosive functionalities for the protection of A2024 aluminum alloy[J]. MATERIALS RESEARCH EXPRESS,2019,6(11):16. |
| APA | Njoku, Chigoziri N.,Bai, Weichen,Meng, Meijiang,Arukalam, Innocent O.,Njoku, Demian I.,&Li, Ying.(2019).Epoxy-based bi-layer self-repairing coating with anti-corrosive functionalities for the protection of A2024 aluminum alloy.MATERIALS RESEARCH EXPRESS,6(11),16. |
| MLA | Njoku, Chigoziri N.,et al."Epoxy-based bi-layer self-repairing coating with anti-corrosive functionalities for the protection of A2024 aluminum alloy".MATERIALS RESEARCH EXPRESS 6.11(2019):16. |
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