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Nanofluids are defined as stable colloidal suspensions of nanoparticles within solvents. Over the past thirty years, they have emerged as promising candidates for various energy applications due to their unique material properties, which often exhibit anomalous behaviors, such as enhanced thermal energy storage (TES). The thermophysical properties and transport phenomena of nanofluids, including unusual mass transfer characteristics, can be complex and differ significantly from those of the base solvents. The envisioned applications of nanofluids are diverse and include their use as cooling agents in automobiles and manufacturing plants; as heat transfer fluids (HTFs) in heat exchangers for conventional thermal power plants, nuclear power plants, and renewable energy systems like concentrated solar power (CSP) plants; as materials for enhanced thermal energy storage, either in the form of sensible heat stored in molten salt nanofluids or latent heat in phase change materials (PCMs); as surfactants for cleaning purposes; as agents for mitigating radiation; and as corrosion inhibitors. This study investigates the corrosion performance of nanofluids when applied to metallic and alloy substrates for potential applications. Electrochemical experiments were conducted to assess the corrosion response and extent in aluminum and scratched brass. To evaluate the feasibility of adding nanoparticles to coolants, aluminum and brass surfaces were exposed to 0.01 M NaCl water solutions doped with silica nanoparticles at concentrations of 0.05% and 0.1% by mass, along with sodium dodecyl benzene sulfonate (SDBS) at 0.1% by mass. The results showed that the relative corrosion performance of the nanofluids is highly sensitive to the material nature of the tested substrates. Both brass and aluminum demonstrated improved corrosion resistance upon the introduction of silica SDBS additives into the fluid.