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Polymer science, Coating and films
The aim of this experimental research is to study the ability of niobium rich sol-gel coatings to withstand thermal stress, while remaining impermeable to corrosive agents for the protection of aerospace alloys. The coating material is developed via polymeric sol-gel synthesis employing 3-(trimethoxysilyl)propylmethacrylate (MAPTMS) and niobium ethoxide precursors as a source of silicon and niobium, respectively. The beneficial effect of niobium inclusion within coating was characterised spectroscopically, calorimetrically and electrochemically. The thermal cycling effects of the coating were studied using microscopic and accelerated test methods. Electrochemical tests showed that corrosion current of the material was 2 orders lower in magnitude than MAPTMS coating. The neutral salt spray test results of thermal stressed samples prove that inclusion of niobium nanoparticles within the silane matrix considerably improves the corrosion resistance performances in salt spray test resulting in better ability to resist thermal shock failure when compared to the MAPTMS coating alone.
Varma, R., Oubaha, M., Periyat, P., McDonagh, C., Duffy, B.: Application of Niobium Enriched Ormosils as Thermally Stable Coatings for Aerospace Aluminium Coatings. Surface and Coatings Technology, Volume 205, Issue 16, 15 May 2011, Pages 3992-3998.