Nanoparticle-based anticorrosion coatings for molten salts applications

High-temperature molten salt systems are employed in a wide variety of industrial applications, linked to energy production and storage, such as concentrated solar power, waste heat recovery, storage plants, fuel cells nuclear, etc. The reactivity of these salts is one of the main issues to address for the employment of affordable steels as constructive materials. In this work, the performance of a polymeric anticorrosion coating based on nanoparticles is analyzed for carbon and stainless steel subjected to solar salt, at 390 and 565 degrees C, respectively.The application of the protective coating produced a more homogeneous corrosion layer in both steels compared to uncoated samples. For carbon steel, the spallation of the corrosion layer was mitigated. For stainless steel, the corrosion was significantly reduced. The was confirmed by SEM-EDX confirmed the inclusion of alumina nanoparticles into the corrosion scale and their reaction with stainless steel to form mixed oxides was corroborated by XRD. Molten salts were analyzed by ICP. The obtained results pave the way for anticorrosion coatings based on nanoparticles for high temperature molten salts applications.

Automated summary

In this study, a polymeric anticorrosion coating based on nanoparticles was evaluated for carbon steel and stainless steel in solar salt environment at temperatures of 390℃ and 565℃, respectively. The coated samples showed a more homogeneous corrosion layer and reduced corrosion compared to uncoated samples. The inclusion of alumina nanoparticles into the corrosion scale and their reaction with stainless steel to form mixed oxides were confirmed by SEM-EDX and XRD analysis. ICP analysis was used to examine the molten salts. These findings suggest the potential of using nanoparticle-based anticorrosion coatings for high-temperature molten salt applications.