Influence of Al2O3 nanoparticles on the corrosion behavior of brass in simulated cooling water

The influence of Al 2 O 3 nanoparticles on the corrosion behavior of brass in simulated cooling water (SCW) with or without sodium dodecyl benzene sulfonate (SDBS) was investigated by means of electrochemical impedance spectroscopy , polarization curves, scanning electron microscope, energy spectrum analysis, X-ray diffraction and Fourier transform infrared spectroscopy . Results indicate that the brass suffered severe corrosion in SCW and the SCW-Al 2 O 3 nanofluid. The main corrosion product was Zn 5 (OH) 6 (CO 3 ) 2 . Al 2 O 3 nanoparticles promoted both anodic and cathodic processes in the brass electrode, and dezincification was most serious in the SCW-Al 2 O 3 nanofluid. The adsorption of SDBS on the brass surface was enhanced, and a more compact protective film was formed on the brass surface in the SCW-Al 2 O 3 -SDBS nanofluid. As a result, the corrosion resistance of brass was increased in this medium.