Ceramic coatings on metals prepared by sol-gel technique for corrosion resistance study

Sahu, A Kumar and Panda, P K (2005) Ceramic coatings on metals prepared by sol-gel technique for corrosion resistance study. Journal of Metallurgy and Materials Science, 47 (1). pp. 25-29.

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Aluminium metal substrates were coated with silica, titania and silica-titania using the alkoxide precursors. The coating solutions were prepared by hydrolysis and condensation reactions of the alkoxide precursors. The metal substrates were pre-treated and coatings were prep-ared by dip coating the substrates in coating solutions of suitable consistency. They were withdrawn at a constant rate of I min/sec. The coated substrates were heat treated in the temperature range of350-500°C for 2 hrs. The corr-osion resistance of coated substrates was measured by potentio-dynamic polarization test using 5% I-12SO4 as well as 3.5% NaCI solutions and the results were compared with corrosion of bare metal. From the above study, it was observed that the corrosion rate of alum-inium metal was reduced by 86% for silica coatings, 25% for titania coatings and 77% for silicatitania coatings in 5% H2SO4 solutions. Similarly, the corresponding reduction of corrosion rates was 99%. 90% and 95% respectively in 3.5%NaCl solution. The corrosion resistance of silica coatings was very good compared to poor resistance of pure titania coatings. The addition of silica increases the corrosion resistance of titania appreciably.

Item Type:Article
Official URL/DOI:http://eprints.nmlindia.org/5066
Uncontrolled Keywords:Ceramic coatings; sol-gel technique; corrosion resistance
Divisions:Corrosion and Surface Engineering
ID Code:5066
Deposited By:Dr. A K Sahu
Deposited On:30 Apr 2012 10:46
Last Modified:01 May 2013 13:37
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