Tsai Shang-Tien, ChangJean Wen-Chyuan, Huang Lin-Yi, Tsai Tseng-Chang
Hawing GemS Technology Corporation, Taichung 402, Taiwan.
Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung 811, Taiwan.
Materials (Basel). 2020 Oct 15;13(20):4595. doi: 10.3390/ma13204595.
MFI zeolite film coated on AA6061 alloy was prepared from fumed silica modified with/without n-octyldecyltrimethoxysilane (ODS) by means of dry gel conversion (DGC) method. The DGC-grown MFI zeolite film could form a strong barrier to protect AA6061 surface against the corrosion from NaCl solution. By using fumed silica as a starting material, the hydrophilicity and anti-corrosion capability of the MFI zeolite film declined with increasing humidity in the DGC synthesis. By silanization with ODS, the surface hydrophobicity of the MFI zeolite film increased, leading to substantial enhancement in anti-corrosion capability. On the other hand, MFI film grown from ODS-modified fumed silica exhibited low hydrophilicity and a much improved anti-corrosion protection property by four orders of magnitude, even stronger than the ODS post-treated MFI film. The strong anti-corrosion capability is attributed to the "thick layer" surface hydrophobicity of zeolite crystal.
采用干凝胶转化（DGC）法，以用/不用正辛基癸基三甲氧基硅烷（ODS）改性的气相二氧化硅为原料，在AA6061合金上制备了MFI沸石膜。通过DGC生长的MFI沸石膜可以形成一个强大的屏障，保护AA6061表面免受NaCl溶液的腐蚀。以气相二氧化硅为原料时，在DGC合成过程中，MFI沸石膜的亲水性和抗腐蚀能力随湿度增加而下降。通过用ODS进行硅烷化处理，MFI沸石膜的表面疏水性增加，导致抗腐蚀能力大幅提高。另一方面，由ODS改性的气相二氧化硅生长的MFI膜表现出低亲水性，并且抗腐蚀保护性能提高了四个数量级，甚至比ODS后处理的MFI膜更强。强大的抗腐蚀能力归因于沸石晶体的“厚层”表面疏水性。
