Development of SiO2 coatings on metals by SOL-GEL technique

Sahu, AK and Panda, PK (2003) Development of SiO2 coatings on metals by SOL-GEL technique. In: Proceedings of the National Conference on Materials and Related Technologies (NCMRT-2003), 19-20 Sep 2003, Patiala (Punjab) India.

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SiO2 coatings on different metal substrates like aluminium, stainless steel etc were prepared by sol-gel dip coating technique. Tetra Ethyl Ortho Silicate (TEOS) solution (40%) in ethyl alcohol was used as the precursor for silica coatings. Hydrolysis of TEOS was effected with water to obtain coating solutions of suitable consistency for coatings. Various metal substrates were mechanically polished and chemically etched in suitable pickling solution to activate the metal surface for coating and then dip coated in already prepared silica coating solutions. The substrates were withdrawn at a constant rate of 2mm / sec. The coatings were subjected to heat treatment at different temperatures. The thickness of the coatings was measured and the surface of the coated specimen was characterised by scanning electron microscopy. The corrosion resistance of the coatings was measured in 3.5% NaCl solution and also in 5% H,SO, acid solution by the standard potentio-dynamic polarization technique. It was observed that the corrosion resistance of the SiO, coated A1 metal is about 65-92% as compared to the bare A1 metal. Silica coating on stainless steel was of nano-sized, with a pleasant light golden colour. The above coatings have high commercial value particularly for corrosion and abrasion resistant applications.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Corrosion resistance;Ceramic oxide coatings;sol-gel technique
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 15 Nov 2012 08:49
Last Modified: 15 Nov 2012 08:49

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