Effect of TiO2 nanoparticles and SDBS on corrosion behavior of 3003 aluminum alloy in aqueous ethylene glycol containing chloride ions at high temperature

Highlights: • The corrosion effect of TiO₂ nanofluids antifreeze on engine was studied at 88 ℃. • The co-existence of SDBS and TiO₂ nanoparticles can shield Cl^- and inhibit corrosion. • The best corrosion inhibition occurred at 2500 mg/L SDBS and 0.1 vol% TiO₂. -- Abstract: The antifreeze mainly composed of aqueous ethylene glycol is easily contaminated with chloride ions, which will accelerate corrosion of aluminum alloy in the components of the engine heat transfer system at long-term high temperatures. In the present work, corrosion behavior of 3003 aluminum (Al) alloy with the addition of TiO₂ nanoparticles and sodium dodecyl benzene sulfonate (SDBS) in aqueous ethylene glycol (EGW) containing chloride ions at 88 ℃ was examined. The corrosion behavior of 3003 Al alloy was investigated by potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The scanning electron microscopy (SEM), energy dispersion X-ray (EDX) and Fourier transform infrared spectroscopy (FT-IR) were used to explore the morphology, structure, and composition of the sediment on the alloy surface. And the Turbiscan Lab (TLAB) dispersion stability analyzer was utilized to test the dispersion stability of TiO₂ nanofluids. The experimental results demonstrated that the co-existence of TiO₂ and SDBS performed the significant corrosion inhibition, and can protect alloy from chloride ions.