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- Title
Investigation of smart graphene oxide multilayer nanocoating for improved steel structural protection in natural seawater.
- Authors
Beryl, J. Raja; Xavier, Joseph Raj
- Abstract
The GO-AMTT/TiS2 nanofiller was developed by combining surface-modified titanium disulphide (TiS2) with graphene oxide (GO) and 2-amino-5-methylthio-1H-1,2,4-triazole (AMTT), and it was subsequently incorporated into the epoxy resin (EP) to produce EP-GO-AMTT/TiS2 nanocomposite. Using electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM), the performance of epoxy coating on mild steel as a barrier against different concentrations of GO-AMTT/TiS2 in naturally occurring seawater was evaluated. It was found that that epoxy coating with 0.6 weight percent of GO-AMTT/TiS2 nanoparticles exhibited the highest resistance after exposed to seawater for 1 h. The limiting oxygen index test and thermogravimetric analysis revealed that the GO/AMTT-TiS2 significantly improved the flame retardancy properties of the epoxy coating. The peak heat release rate and total heat release values for the EP-GO/AMTT-TiS2 significantly decreased by 74% and 66%, respectively, as compared to pure EP, showing that the material is more flame retardant. The EIS experiments showed that the EP-GO/AMTT-TiS2 nanocomposite had increased coating resilience even after 960 h of submersion in seawater. According to SECM investigations, a small amount of ferrous ions was released at the scribe area of the EP-GO/AMTT-TiS2 coating. This is because the coated substrate is more resistant to anodic dissipation than the uncoated substrate. The developed EP-GO/AMTT-TiS2 coating has higher protective and hydrophobic (WCA: 157°) characteristics. The epoxy matrix's adhesive properties were enhanced by the addition of GO/AMTT-TiS2. Therefore, an EP-GO/AMTT-TiS2 nanocomposite may be employed in an industrial coating.
- Subjects
STRUCTURAL steel; GRAPHENE oxide; HEAT release rates; NANOCOATINGS; SEAWATER; FIRE resistant polymers; ARTIFICIAL seawater
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 2, p458
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-023-09190-z