Bahareh Javanpour, et al. Journal of Applied Electrochemistry, 2022, 52(1), 67-83.
Double silane treatment of the anodized layer using two alkoxysilanes with different functional groups. The anodized samples were first silane treated with tetraethoxysilane (TEOS) sol, and then subjected to secondary modification treatment with trimethoxypropylsilane (TMPSi). The results show that two alkoxysilanes with different functional groups are compatible and improve overall corrosion resistance.
Silane treatment procedure
· First, prepare the sol starting solution with tetraethoxysilane (TEOS) and ethanol (EtOH). After an aging process for a day, the dip-coating technique was conducted using a dip coater adjusted at a 20 cm/min constant withdrawal rate. Coated samples had been dried under a controlled condition at 60-70 °C for 1 h to avoid cracking, and followed a heat treatment for 1 h at 300 °C for in an oven.
· As for the modifcation step, the sample was retreated by the trimethoxypropylsilane sol (TMPSi). Therefore, a sol was synthesized using distilled water and Ethanol in TMPSi: EtOH: water, 1:10:10 molar ratio adjusted in pH 2.3 by (0.1 M) HNO3. Likewise, the sample was immersed in the second sol (TMPSi sol) and then dried under the same condition. Ultimately, heat treatment lasted for 1 h at 150 °C.
Emarati, et al. Surface Engineering, 2019, 35(5), 456-465.
