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Preparation and corrosion behavior of Cu-8-HQ@HNTs/epoxy coating.
- Source :
-
Progress in Organic Coatings . Feb2020, Vol. 139, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- • Cu-8-HQ@HNTs controlled the release of 8-HQ in response to acidic environment. • Cu-8-HQ@HNTs were distributed uniformly in epoxy and reduced the hydrophilicity of coating. • Cu-8-HQ@HNTs/epoxy coating provided long-term corrosion resistance. • Cu-8-HQ@HNTs/epoxy coating exhibited self-healing behavior under damage. 8-Hydroxyquinoline (8-HQ) corrosion inhibitor was loaded into halloysite nanotubes (HNTs) under negative pressure and encapsulated by Cu-8-HQ complex stopper, and then Cu-8-HQ@HNTs/epoxy coating was prepared by mixing Cu-8-HQ@HNTs with epoxy. The surface morphology, wettability and adhesion of coating were observed and determined by optical microscopy, sessile water droplet static contact angle and pull-off adhesion tester. The releasing behavior of 8-HQ in water was investigated by UV–vis spectrophotometer, and the corrosion resistance of epoxy coatings in 3.5% NaCl solution was analyzed by electrochemical impedance spectroscopy (EIS). Results show that the prepared Cu-8-HQ@HNTs complex has a higher release rate in acidic environment than that in neutral and alkaline solution. Cu-8-HQ@HNTs/epoxy coating has a smooth morphology, a higher and more stable corrosion resistance than that of blank epoxy coating and 8-HQ@HNTs/epoxy coating. The self-healing behavior of Cu-8-HQ@HNTs/epoxy coating is attributed by the dissolution of end stopper of HNTs due to the acidification of scratched coating edge zone and the release of 8-HQ from the HNTs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03009440
- Volume :
- 139
- Database :
- Academic Search Index
- Journal :
- Progress in Organic Coatings
- Publication Type :
- Academic Journal
- Accession number :
- 141028383
- Full Text :
- https://doi.org/10.1016/j.porgcoat.2019.105434