Abstract
Nowadays, a variety of techniques exist for mitigating the effects of corrosion, including the use of anticorrosive coatings. In this study, we investigate the impact of viscosity on the final quality of a silica/PDMS-based ceramic coating, synthesized through sol-gel methodology. The polycondensation of tetraethylorthosilicate (TEOS) with polydimethylsiloxane (PDMS) was conducted at concentrations of 10, 20, and 40 wt.%, employing DBTL as a catalyst. The coatings were deposited on Al-6061 surfaces via immersion. Infrared spectroscopy indicates the integration of the inorganic phase (SiO₂; 1100 cm⁻¹, 720 cm⁻¹) with the siloxane chain (PDMS; 2900 cm⁻¹, 1250 cm⁻¹, 920 cm⁻¹, 785 cm⁻¹). As the siloxane chain length increased, modifications to the silica structure were observed, with the appearance of signals at 889 cm-1, 867 cm-1, and 835 cm-1. Conversely, the gelation times are reduced in proportion to the PDMS content in the sol solution. Therefore, to obtain smooth and homogeneous finishes, different gelation times are required when applying solutions with viscosities between 5 and 12 mPa·s. These coatings exhibited the most significant increase in corrosion resistance, reaching approximately 75%.
Published Version
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