Rapid corrosion of magnesium alloys in the physiological environment limits their use as orthopedic implant materials. Therefore, the silane film modified with nano-hydroxyapatite (nHA) was prepared on the surface of AZ31 magnesium alloy to improve its corrosion resistance. The silane films are continuous, uniform, and adherent well to the Mg substrate, and the modification of the film by nHA increased the thickness from ∼1.92 to ∼3.25 μm. Compared to the bare substrate, the corrosion current density of the sample with the silane film modified with nHA decreases by three orders of magnitude from 9.23× 10−5 to 2.779 × 10−8 A/cm2. According to the immersion tests, it is found that the synergistic effect of sub-film corrosion and blistering is the dominant mode of film failure. During the immersion of less than 72 h, the modification by nHA improves the corrosion resistance by delaying the sub-film corrosion and blistering of the film.
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Song et al. (2024) studied this question.
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