Abstract
This paper presents the process of preparing a phosphoric-acid thin anodic oxide composite film on an 18 μm aluminum alloy foil. The parameters of anodizing were adjusted to obtain a thin anodic oxide film, and then the nano-pores of the film were sealed by electrodeposited silane doped with Y3+. A dense and uniform oxide-organic composite film (called TAO-Si@Y film) with a thickness of only about 275 nm was successfully prepared. The structure, morphology, composition and corrosion resistance of the composite film were investigated using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), energy spectroscopy (EDS), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and neutral salt spray. The silanol groups of the silane reacted with the thin anodic oxide film to form Al-O-Si. The TAO-Si@Y film had a corrosion current density icorr of 9.18 × 10−9 A cm−2 and a low-frequency impedance modulus |Z|0.01 of 2.26 × 106 Ω cm2, which could provide long-term corrosion protection to the Al foil substrate. Furthermore, the influence of the Y3+ doping in silane solution on the composite film was also discussed.
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