The Assembly of Silicalite-1 Layer on Open Cell Aluminum Foam and Its Corrosion Resistance

In this paper, three different methods (secondary growth method, in situ hydrothermal method and hot pressing with silane method) for synthesizing silicalite-1 molecular sieve anti-corrosive film on open-cell aluminum foam surface were studied, and the silane coupling agent was used as a connecting layer to enhance the bonding force. The surface morphology was observed by scanning electron microscopy, the phase composition was analyzed by x-ray diffraction, and the corrosion resistance was predicted by electrochemical test results. It was shown that the silicalite-1 anti-corrosion film prepared by the secondary growth method has the best surface, crystallinity (more than 98%), anti-corrosion performance, and good hydrophobicity. Finally, through Raman Microscopy test, the film formation mechanism of the secondary growth method was analyzed. The results show that the initial hydrogen bonds between the hydroxyl groups of the molecular sieve particle and the hydroxyl groups of the silane coupling agent change to covalent bonds due to the dehydration condensation reaction, and other free hydroxyl groups react in the same way with the hydroxyl groups on the aluminum foam surface.