Self-healing anti-corrosion coating of graphene.
Self-healing anti-corrosion coating of graphene is restored in seconds. It is tolerant of extreme environmental conditions. It can even be applied under water, on surface with any geometry.
Any anti-corrosion coating designed to protect surface of metal from the impact of destructive environmental factors. However, as a rule, in violation of the integrity of this coating, it loses its effectiveness. Eventually over time the metal surface is covered with rust and corrodes.
Developed a self-healing anti-corrosion coating of graphene is restored in seconds, preventing the formation of barely visible defects. The new coating is resistant to extreme environmental conditions. It can even be applied under water, on surface with any geometry.
Experiments have shown that covered with a new anti-corrosion coating, the metal surface 200 times rebuild their structure after repeated mechanical damage (scratches, bumps, chips, etc.) and is not subjected to corrosion in hydrochloric acid solution.
Coating the chemical composition is a silicone oil (polymerized siloxane) with the addition of hollow microcapsules recovered from oxide graphene. Externally it is a low-viscosity oil film.
The coating combines the properties of fluidity and viscosity. The fluidity of the coating lends itself silicone oil, and the viscosity of microcapsules graphene. A small concentration of microcapsules graphene is able to significantly increase the viscosity of the oil. Five % of the total mass of the microcapsules increases it a thousand times. The particles are heavier, oily liquid.
It is the fluidity provides rapid, almost instant, self-correct a violation of the integrity of the coating. But viscosity does not allow the coating to drain from the surface of the metal.
Graphene microcapsules when added to silicone oil to absorb it, forming the linked structure of the protective coating. When the violation of the oil out of the capsules and restores the connection between the damage.
Here are the links to the sources:
https://hi-news.ru/technology/uchenye-sozdali-iz-grafena-samovosstanavlivayushheesya-antikorrozijnoe-pokrytie.html ; https://spj.sciencemag.org/research/2019/3517816/ .
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