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. 2020 May 29;10(6):1046.
doi: 10.3390/nano10061046.

Comparison of the Corrosion Behavior of Brass in TiO2 and Al2O3 Nanofluids

Siyu Xie  1 , Yi Zhang  1 , Yanfang Song  1 , Fang Ge  1 , Xin Huang  1 , Honghua Ge  1 , Yuzeng Zhao  1
Affiliations

Comparison of the Corrosion Behavior of Brass in TiO2 and Al2O3 Nanofluids

Siyu Xie et al. Nanomaterials (Basel). .

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.

Keywords: Al2O3 nanofluid; TiO2 nanofluid; brass; corrosion; sodium dodecyl benzene sulfonate.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Nyquist plots of brass immersed in different media for 5 days.
Figure 2
Figure 2
Equivalent circuit for fitting electrochemical impedance spectroscopy (EIS).
Figure 3
Figure 3
Potentiodynamic polarization curves of the brass electrode after immersion for 5 days in different media.
Figure 4
Figure 4
SEM photos and EDS results of the brass surface after immersion of 5 days in different media. (a) Simulated cooling water (SCW); (b) SCW-sodium dodecyl benzene sulfonate (SDBS); (c) SCW-SDBS-TiO2 nanofluid; and (d) SCW-SDBS-Al2O3 nanofluid.
Figure 4
Figure 4
SEM photos and EDS results of the brass surface after immersion of 5 days in different media. (a) Simulated cooling water (SCW); (b) SCW-sodium dodecyl benzene sulfonate (SDBS); (c) SCW-SDBS-TiO2 nanofluid; and (d) SCW-SDBS-Al2O3 nanofluid.
Figure 4
Figure 4
SEM photos and EDS results of the brass surface after immersion of 5 days in different media. (a) Simulated cooling water (SCW); (b) SCW-sodium dodecyl benzene sulfonate (SDBS); (c) SCW-SDBS-TiO2 nanofluid; and (d) SCW-SDBS-Al2O3 nanofluid.
Figure 4
Figure 4
SEM photos and EDS results of the brass surface after immersion of 5 days in different media. (a) Simulated cooling water (SCW); (b) SCW-sodium dodecyl benzene sulfonate (SDBS); (c) SCW-SDBS-TiO2 nanofluid; and (d) SCW-SDBS-Al2O3 nanofluid.
Figure 4
Figure 4
SEM photos and EDS results of the brass surface after immersion of 5 days in different media. (a) Simulated cooling water (SCW); (b) SCW-sodium dodecyl benzene sulfonate (SDBS); (c) SCW-SDBS-TiO2 nanofluid; and (d) SCW-SDBS-Al2O3 nanofluid.
See this image and copyright information in PMC

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