Fig. 1 (a) shows the XRD results of magnesium alloy surface before and after hydrothermal treatment. Mg(OH)2 generates diffraction peaks at around 33 °, 37 °, 58 °，62 ° and 73° which is consistent with the literature. Compared with the bare AZ31B, the diffraction peak observed at 18 ° belongs to the (006) surface of LDH, which is caused by the aluminum content in magnesium alloy. Besides, the strength of the LDH peak is very low, which indicates that the surface of the alloy after hydrothermal treatment is mainly Mg(OH)2. The functional group differences on the surface of H3 (hydrothermal treated for 3 h) samples before and after PTES modification were compared by FT-IR spectroscopy, as shown in Fig. 1 (b). After PTES modification, the new peaks appeared at 1150 cm−1 and 1196 cm-1. The former is a C−F bond stretching vibration peak, which can be attributed to the superhydrophobic surface introduced by PTES, and the latter is cross-linked between Si−OH after hydrolysis of PTES. In summary, the superior water-repellent properties of superhydrophobic coatings are attributed to the combination of surface-interleaved micro-nano-scale roughness and low surface energy PTES modification.
Fig. 1 (a) XRD spectra of the Mg(OH)2 layer on the AZ31B magnesium alloy. (b) FT-IR spectra of samples H3 (i) and H3/PTES (ii) [1].
[1] Zhang Y , Feng Y , Meng X , et al. The Study on Enhanced Superhydrophobicity of Magnesium Hydroxide Corrosion‐Resistant Coating on AZ31B after 8 Months[J]. Advanced Engineering Materials.
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