Process for the preparation of corrosion resistant silica coatings on metal

Panda, PK (2010) Process for the preparation of corrosion resistant silica coatings on metal. 242254.

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Abstract

The invention describes a process for the preparation of silica coatings by passing steam over tetra ethyl ortho silicate (TEOS) wherein TEOS in alcohol medium is heated to obtain concentrated TEOS TEOS so obtained is subjected to steam to hydroiyse to silicon tetra-hydroxide simultaneously diluting the concentrated solution to a viscosity level suitable for coating. Metal substrates such as aluminium polished and pre-treated with pickling solutions was dipped into the above coating solution. The substrate was then dried in the temperature range of 60-110°C followed by sintering / heat treating to obtain uniform coatings of silica. The process of the present invention such as control of viscosity, uniformity of the final coatings removes the major drawbacks of the prior art / existing process in which TEOS is also used as coating precursor. The silica coated metal substrates find application such as in corrosion resistance.

Item Type: Patent
Uncontrolled Keywords: Silica coatings;Corrosion resistant;Tetra ethyl ortho silicate (TEOS)
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 15 Nov 2012 14:17
Last Modified: 15 Nov 2012 14:17
URI: http://nal-ir.nal.res.in/id/eprint/11350

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