Abstract
The amorphous Ni–P layer of high phosphorus content was deposited on 3003 aluminum alloy sheet either without interlayer or over an interlayer of sprayed Al–Ce coating. Their surface morphology, microstructure and chemical composition distribution were analyzed using scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). Their corrosion resistance was characterized by potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and immersion corrosion test. The results showed that the corrosion resistance of Ni–P coating with sprayed Al–Ce interlayer was superior to that of conventional electroless Ni–P coating. The corrosion current density and corrosion rate of Ni–P coating with sprayed Al–Ce interlayer decreased greatly compared with conventional electroless Ni–P coating.
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