Long-term corrosion resistance of zinc-rich paint using functionalised multi-layer graphene-tripolyphosphate: in situ creation of zinc phosphate as corrosion inhibitor

Abstract

This study investigates the effect of hybrid multilayer graphene-tripolyphosphate on long-term corrosion protection efficiency of zinc-rich paint. The hybrid nanomaterial as a corrosion resistance modifier was prepared trough a simple method by the addition of sodium tripolyphosphate aqueous solution to a dispersed multi-layer graphene in water/ethanol during stirring. The performance of the hybrid nanomaterial was studied by salt spray, electrochemical impedance spectroscopy, scanning electron microscopy, X-ray diffraction, cathodic delamination and pull-off adhesion test. The experimental results showed that in the presence of 1 wt-% of the hybrid nanomaterial, cathodic protection duration increased from 28 days to more than 50 days. The improvement in the barrier property and the cathodic delamination resistance was significant in the presence of the nanomaterial after two years long-term study. X-ray diffraction analysis showed that the formation of zinc phosphate was responsible for the higher corrosion protection efficiency.

The effect of the hybrid multi-layered Graphene oxide/Talc as a hydrophobic agent in epoxy coating

“…Preparation of the multi-layered Graphene oxide MLGO was prepared according to the previous work [26]. Briefly, MLGO was prepared by the rapid thermal expansion (one minute) of the expandable Graphite at 700°C to form expanded Graphite (EG).…”

Assessment of Anticorrosion Performance of Zinc-Rich Epoxy Coatings Added with Zinc Fibers for Corrosion Protection of Steel

“…Therefore, many efforts have been made to reduce zinc loading and/or improve the anticorrosive properties of zinc-rich coatings. Surface modification of zinc is a common way to reduce the particle electrochemical activity by forming a complex layer on its surface and thus prolongs the cathodic protection time of zinc-rich coatings. , The incorporation of lamellar pigments such as lamellar Al particles, micaceous iron oxide, and clay nanolayers has been reported to decrease the zinc consumption rate by hindering the electrolyte penetration and therefore extending the cathodic protection period. , In addition, phosphate-type pigments and hydrophobic additives such as TiO 2 nanoparticles and ionic liquids were incorporated to improve the inhibitive effect of zinc-rich coatings. − The electrical connectivity in zinc-rich coatings and hence the utilization efficiency of zinc particles can be improved by adding electrically conductive materials. Metallic nanoparticles such as Zn and Al nanoparticles, , conductive polymers/composites such as polypyrrole and polyaniline, ,− conductive pigments such as diiron phosphide (Fe 2 P) and stainless-steel flakes, and many carbon-based additives such as biochar, carbon nanotubes, , and graphene ,, are reported to effectively improve the film conductivity, leading to a better cathodic protective activity.…”

“… 9 , 10 In addition, phosphate-type pigments and hydrophobic additives such as TiO 2 nanoparticles and ionic liquids were incorporated to improve the inhibitive effect of zinc-rich coatings. 11 − 13 The electrical connectivity in zinc-rich coatings and hence the utilization efficiency of zinc particles can be improved by adding electrically conductive materials. Metallic nanoparticles such as Zn and Al nanoparticles, 14 , 15 conductive polymers/composites such as polypyrrole and polyaniline, 6 , 16 − 18 conductive pigments such as diiron phosphide (Fe 2 P) 19 and stainless-steel flakes, 20 and many carbon-based additives such as biochar, 21 carbon nanotubes, 22 , 23 and graphene 1 , 24 , 25 are reported to effectively improve the film conductivity, leading to a better cathodic protective activity.…”