The micro-arc oxidation/graphene
oxide (MAO/GO) composite coatings
were successfully prepared on the surface of magnesium alloys by the
MAO and electrodeposition technologies. The morphology and composition
of the MAO/GO composite coatings were characterized by scanning electron
microscopy, energy-dispersive spectrometry, X-ray diffraction, X-ray
photoelectron spectroscopy, UV–vis spectroscopy, Raman spectroscopy,
roughness test, and binding test. The electrochemical impedance spectroscopy,
polarization curve, and immersion test were used to evaluate the protection
performance of MAO/GO composite coatings provided to a substrate.
The test results showed that GO covered the surface of the MAO film
and had a multilayer structure in the composite coatings. The composite
coatings performed the function of sealing the micropores of the MAO
film. The elements in the surface of the composite coatings were evenly
distributed and the C element content was high. We find that the composite
coatings were smoother than the MAO film. The bonding force of the
composite coating needs to be enhanced. The corrosion resistance of
the MAO/GO composite coatings was obviously better than that of a
single MAO film.
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