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Anticorrosive and photocatalytic properties research of epoxy-silica organic–inorganic coating
Anticorrosive and photocatalytic properties research of epoxy-silica organic–inorganic coating
- Source :
- Colloids and Surfaces A: Physicochemical and Engineering Aspects. 622:126647
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The organic-inorganic hybrid coating was fabricated for anti-corrosion application using bisphenol A diglycidyl ether (BADGE) epoxy resin with inorganic silica nanoparticles prepared by sol-gel method. The precursor, tetraethyl orthosilicate (TEOS) formed via hydrolytic condensation the silica dispersed in the protective coating on the metal substrate that could prevent the permeation of corrosive media. In order to increase the functionality of the coating, the photocatalyst zinc oxide (ZnO) nanoparticles were added to bestow the light degradation on the coating. The as-fabricated nanoparticles and coatings were analyzed using Fourier Transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–vis spectrum (UV–vis) analysis. The anti-corrosion performance of the organic-inorganic hybrid coating was investigated by electrochemical impedance spectroscopy (EIS) and salt spray tests. Noteworthily, EIS results showed that the epoxy-silica organic-inorganic coating was109Ωcm2,which could increase the impedance modulus (at 0.01 Hz) of Q215 steel by about 7 orders of magnitude after immersion in 3.5 wt% NaCl aqueous solution for 96 h. The salt spray test results showed that metal substrate was still not completely corroded after 68 days. In addition, the addition of ZnO to the coating has photo-degradation effect on methyl orange and the photo-degradation efficiency can reach 55%.
- Subjects :
- Materials science
Nanoparticle
02 engineering and technology
Epoxy
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Dielectric spectroscopy
Tetraethyl orthosilicate
chemistry.chemical_compound
Colloid and Surface Chemistry
Chemical engineering
chemistry
Coating
visual_art
visual_art.visual_art_medium
Methyl orange
engineering
Salt spray test
Fourier transform infrared spectroscopy
0210 nano-technology
Subjects
Details
- ISSN :
- 09277757
- Volume :
- 622
- Database :
- OpenAIRE
- Journal :
- Colloids and Surfaces A: Physicochemical and Engineering Aspects
- Accession number :
- edsair.doi...........6b26c1bc7414f74803e8f9f0ef997959
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2021.126647