I'm trying to develop a coating for tillage implements. CRS are dipped in sodium silicate and then will be dipped on HMDS. I am curios if HMDS will attached to the metal by doing this so. I also employed solvent exchange method to remove water on the pore spaces of my sodium silicate coating.
Make sure Your metal surface is perfectly clean, metals are always coated with some sort of grease. You can try some adhesion promoters like aromatic amines, or immersing metal in phosphoric acid with some Zn cations first (creates phosphate layer). If You have problems, replace sodium silicate with ethanol solution of tetraetoxysilane (2-5%), and let it dry overnight. TEOS hydrolyse and polymerise forming SiO2 on the surface.
Thank you! I initially clean the metal substrates with Ethanol before dipping it with sodium silicate.
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