Electrochemical Properties of Melting Gel Coatings

Abstract

Organic-inorganic melung gel coatings were applied to titanium alloy substrates to decrease their corrosion and extend their lifetime in an eiecirochemical application. Melting gels containing phenyl substitutions were coated onto the substrates. The ratio of diphenyl dimethoxysilane (DPhDMS) to methanol was varied to change the thickness of the coatings. The coadngs were inspected visually to see that there is good adhesion between the coating and the substrate. Nanoindenter tests were performed to determine hardness.

Obtaining Thickness-Limited Electrospray Deposition for 3D Coating

“…The third material was an oligomeric silsesquioxane made by a sol–gel process as described elsewhere. − These “melting gels” (MGs) possess consolidation temperatures, T c 's, between ∼120 and ∼170 °C. MGs have been applied in the past as anticorrosive coatings − and hermetic barriers. , For this study, we used two MG formulations prepared using methyltriethoxysilane (MTES) along with dimethyldiethoxysilane (DMDES) and phenyltriethoxysilane (PhTES), along with dipheynldiethoxysilane (DPhDES). The selected compositions of (mol %) 65%MTES–35%DMDES (65/35) and 87%PhTES–13%DPhDES (87/13) were selected to have a T g below (65/35: −15.7 °C) and above (87/13: 25–30 °C) room temperature and moderate T c ’s (65/35: ∼150 °C, 87/13: ∼135 °C).…”