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Aluminum coatings on Mg alloy AZ31 were fabricated using the thermal spraying technique, and then sealed with silane. The surface morphology and chemical groups were discerned using scanning electron microscopy and examined using Fourier transformation infrared spec-troscopy, respectively. The salt fog tests and the potentiodynamic electrochemical technique were applied to evaluate the influence of silane on corrosion of the AZ31 alloy with aluminum coatings. The results showed that the corrosion resistance of the aluminum-coated AZ31 alloy was superior to that of the substrate. The aluminum coating sealed with various silane layers led to a further increase in the corrosion resistance of the alloy. Double silane layers were more corrosion-resistant than the single one. Also, it was no longer significant for more than two silane layers to improve the corrosion resistance. It implied that the optimum choice for silane treatment on the aluminum coatings was two layers.