Effect of Biomass Carbon Nanoparticles on the Corrosion Resistance of Polyimide Materials
To achieve the resource utilization of biomass and develop high-performance corrosion-resistant coating materials,carbon nanoparticles(CNs)and onion-like carbon(OLCs)were successfully prepared using hydrothermal synthesis and high-temperature carbonization methods,respectively.The two particles were added to polyimide ma-terials to develop high-performance corrosion-resistant coatings.The influence of these particles on the corrosion resistance of polyimide coatings was investigated using an electrochemical workstation.The results indicated that the addition of biomass carbon nanoparticles and onion-like carbon particles had different effects on the corrosion resistance of polyimide coatings.The composite coating modified with onion-like carbon particles(OLCs/PI)signifi-cantly enhanced the corrosion resistance of polyimide compared to the composite coating modified with carbon nanoparticles(CNs/PI).The anti-corrosion mechanism is attributed to the hydrophilic nature of carbon nanoparticles,which tend to dissolve in simulated seawater,thereby reducing the corrosion resistance of the composites.In con-trast,onion-like carbon particles are hydrophobic and provide additional tortuous paths for the penetration of corro-sive media or act as micro-containers to store corrosive media,thus improving the corrosion resistance.Conse-quently,the prepared composites remain stable during seawater immersion,thereby enhancing the corrosion resis-tance of polyimide materials.
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