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Study on Chemical Bonding Between Epoxy Coating and Metal Substrate Using gamma-Aminopropyltrimethoxysilane to Modify Epoxy Resin Molecule
Cao Fachun1,2; Wu Hang3; Yang Yange1,4; Cao Jingyi4; Zhang Tao1,3; Wang Fuhui3
Corresponding AuthorWu Hang(wuhang@mail.neu.edu.cn) ; Yang Yange(ygyang@imr.ac.cn)
2019-02-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:2Pages:238-248
AbstractEpoxy coatings are widely used to protect metals from corrosion in ocean engineering and process industries. It has been proved that the adhesion between epoxy coating and metal is a key factor that affects their service life of the coating. However, interface between epoxy coating and metal substrate is usually combined by weak van der Weals force or secondary bond, which limits the protective performance of coatings. This work aims to translate the interface state from the physical adsorption to chemical bonding so as to increase the service life of epoxy coating. A kind of reactive resin gamma-APS/EP with hydrolysis characteristic was prepared using gamma-aminopropyltrimethoxysilane (gamma-APS), and used as a coating filler with different contents of 0.5%similar to 10%. Both dry and wet adhesion strength of epoxy coatings with different contents of gamma-APS/EP were examined, the resistance to aggressive medium of epoxy varied with the contents of gamma-APS/EP was evaluated by water absorption measurement, and the structure and composition of the coating/metal systems were characterized by using SEM, XPS, DSC and FTIR. The results showed that amino groups in gamma-APS/EP disappeared and methoxysilyl groups (Si-O-CH3) were remained after the synthesis process. Adhesion strength of the epoxy coating with metal substrate was significantly enhanced by introducing gamma-APS/EP. Moreover, the dry adhesion strength of epoxy coating with 3%gamma-APS/EP reached the maximum value of 12.4 MPa, which was twice the strength of pure epoxy, and was decreased with the content of gamma-APS/EP further increasing. Meanwhile, wet interface adhesion strength of epoxy coating with 3% gamma-APS/EP was still kept about 7.4 MPa after 900 h immersion in 3.5%NaCl, more than three times of pure epoxy coating. And also, epoxy coating with 3% gamma-APS/EP showed the best performance with lower saturated water absorption. The chemical bonding can be obtained by the generation of oxane on the interface resulting from the reaction between the synthesized reactive resin and the hydroxyl on the metal surface after the reactive resin was added in the epoxy resin. Furthermore, the content of gamma-APS/EP affected the number of chemical bonds at the interface, the hydrophilicity and the bulk (d)ensity of coating. Finally, an interfacial chemical bonding mechanism was proposed.
Keywordepoxy coating gamma-aminopropyltrimethoxysilane chemical bonding
Funding OrganizationNational Natural Science Foundation of China ; China Postdoctoral Science Foundation
DOI10.11900/0412.1961.2018.00121
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51401217] ; China Postdoctoral Science Foundation[2017M613383]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000455945800008
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/131428
Collection中国科学院金属研究所
Corresponding AuthorWu Hang; Yang Yange
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
3.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
4.Navy Coating Anal & Test Ctr, Beijing 102442, Peoples R China
Recommended Citation
GB/T 7714
Cao Fachun,Wu Hang,Yang Yange,et al. Study on Chemical Bonding Between Epoxy Coating and Metal Substrate Using gamma-Aminopropyltrimethoxysilane to Modify Epoxy Resin Molecule[J]. ACTA METALLURGICA SINICA,2019,55(2):238-248.
APA Cao Fachun,Wu Hang,Yang Yange,Cao Jingyi,Zhang Tao,&Wang Fuhui.(2019).Study on Chemical Bonding Between Epoxy Coating and Metal Substrate Using gamma-Aminopropyltrimethoxysilane to Modify Epoxy Resin Molecule.ACTA METALLURGICA SINICA,55(2),238-248.
MLA Cao Fachun,et al."Study on Chemical Bonding Between Epoxy Coating and Metal Substrate Using gamma-Aminopropyltrimethoxysilane to Modify Epoxy Resin Molecule".ACTA METALLURGICA SINICA 55.2(2019):238-248.
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