Solution-Processed Two-Dimensional Metal Oxide Anticorrosion Nanocoating.

Area of Science:

• Materials Science
• Corrosion Science
• Nanotechnology

Background:

• Graphene-based anticorrosion nanocoatings face industrial limitations due to cost, scalability, and quality issues.
• Two-dimensional (2D) nanomaterials, specifically metal oxide nanosheets, present a promising alternative for advanced anticorrosion applications.

Purpose of the Study:

• To propose requirements for rational anticorrosion nanocoating using metal oxide nanosheets.
• To demonstrate the efficacy of Ti$_{0.87}$O$_{2}$ and Ca$_{2}$Nb$_{3}$O$_{10}$ nanosheet coatings for metal protection.

Main Methods:

• Facile layer-by-layer (LbL) self-assembly technique for fabricating nanosheet coatings.
• Characterization of coating performance on stainless steel (SUS) substrates.
• Evaluation of corrosion resistance, mechanical, and thermal robustness through driving tests.

Main Results:

• 10 and 20 nm thick nanosheet coatings achieved high inhibition efficiency (IE) of 99.92% and 99.89% on stainless steel.
• Nanosheet-coated samples exhibited suitable corrosion resistance, mechanical, and thermal robustness in driving tests.
• Understanding and control of thermal oxidation mechanisms were established for high-temperature applications.

Conclusions:

• Metal oxide nanosheet coatings offer a viable and high-performance solution for anticorrosion nanotechnology.
• The LbL self-assembly method provides a scalable route for industrial implementation.
• Further materials design and understanding of thermal mechanisms will enhance high-temperature applications.