Abstract
The corrosion behavior of brass in TiO2 and Al2O3 nanofluids using a simulated cooling water (SCW) as the base solution and sodium dodecyl benzene sulfonate (SDBS) as the dispersant was studied by electrochemical measurements and surface analysis in this paper. It was found that SDBS could be adsorbed on the brass surface to form a protective film and have a corrosion inhibition effect on brass in SCW. In the SCW-SDBS-TiO2 nanofluid, some negatively charged TiO2 nanoparticles were attached to the brass surface and no obvious SDBS adsorption film was found, and the SDBS in this nanofluid had almost no corrosion inhibition on brass. In the SCW-SDBS-Al2O3 nanofluid, the brass surface was covered by a uniformly distributed SDBS film containing some Al2O3 nanoparticles which were positively charged, and the corrosion inhibition of brass was significantly improved in this nanofluid. It is concluded that the adsorption of SDBS on the brass surface in nanofluids is related to the charge status of the nanoparticles, which makes brass have different corrosion resistance in various nanofluids.
Highlights
Nanofluids are a new type of energy-saving cooling medium, which refer to a uniformly dispersed medium formed by adding nanoparticles to a base solution
In the simulated cooling water (SCW)-sodium dodecyl benzene sulfonate (SDBS)-Al2O3 nanofluid, the SDBS anions can be adsorbed on the surface of the positively charged Al2O3 nanoparticles by electrostatic adsorption, which improved the electrostatic repulsion between the nanoparticles as well
In SCW, the brass surface was covered by loose corrosion products and had poor corrosion resistance
Summary
Nanofluids are a new type of energy-saving cooling medium, which refer to a uniformly dispersed medium formed by adding nanoparticles to a base solution. In order to evenly disperse nanoparticles in the base solution, a certain amount of dispersants (surfactants) is often added to the nanofluids during the preparation [12,13,14]. Sodium dodecyl benzene sulfonate (SDBS) is a common surfactant used in nanofluids, and it exhibits a corrosion inhibition effect on metals at appropriate concentrations [17]. TiO2 and Al2O3 nanoparticles with opposite charging properties were selected to prepare a TiO2 nanofluid and Al2O3 nanofluid, respectively, with simulated cooling water and commonly used SDBS as the base solution and dispersant. In order to determine the effect of the nanoparticles’ charging properties on the aggressiveness of the nanofluids, the corrosion behavior of brass in these two kinds of nanofluids was studied and compared by electrochemical and surface analysis methods in this paper
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