Abstract
The protective bis-[triethoxysilylpropyl]tetrasulfide (BTESPT) silane films doped with cerium were prepared on surface of 7N01 aluminum alloy by dip-coating method. Single variable tests were used to obtain optimal silane concentration, curing temperature and cerium salt concentration. Fourier Transform Infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were used to characterize structure of the formed films. Corrosion performance of the films was evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and soaking tests. The results show that the corrosion resistance of the silane film on 7N01 aluminum alloy is improved greatly by doping of Ce into the silane film. The proper silane volume fraction is 5% and the curing temperature is 100 °C. The optimum cerium nitrate doping into the silane solution is 5 × 10−3 mol/L.
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