Synthesis of self-sacrifice amorphous titanium dioxide-coated aluminum via hydrolysis reaction for anticorrosion application

Abstract

Anticorrosion deposits were prepared on Al alloy substrate surface by a hydrolysis process. In this paper, a hydrolysis reaction technique was applied to prepare TiO2 deposit on Al alloy surface by formation of Al2O3 particles at home temperature. The prepared deposits were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR). The amorphous TiO2 was characterized by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods and the anticorrosion performance in 0.1 M NaCl solution was evaluated by electrochemical measurements. The value of the E corr can positive shift from − 685 to − 539 mV in 0.1 M NaCl. The results indicated that the TiO2 layer provided good barrier on Al alloy surface with Al2O3 particles, and the amorphous TiO2 deposit decreased Al alloy corrosion rate by self-sacrifice. This amorphous deposit can be applied as a protection layer at the Al alloy surface by simple hydrolysis reaction.