IMR OpenIR
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 AuthorNjoku, Demian I.(demian@imr.ac.cn) ; Li, Ying(liying@imr.ac.cn)
2019-11-01
Source PublicationMATERIALS RESEARCH EXPRESS
ISSN2053-1591
Volume6Issue:11Pages:16
AbstractA 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.
Keywordaluminum AA2024 alloy microcapsule bi-layer epoxy coating self-repairing coating
Funding OrganizationNational Natural Science Fund of China ; Institute of Metal Research ; University of Chinese Academy of Sciences (UCAS)
DOI10.1088/2053-1591/ab485b
Indexed BySCI
Language英语
Funding ProjectNational 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 AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000504243700002
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136531
Collection中国科学院金属研究所
Corresponding AuthorNjoku, Demian I.; Li, Ying
Affiliation1.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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