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Title: Characterization of corrosion resistance properties of sol-gel alumina coating in mine water environment
Authors: Ruhi, G
Modi, O P
Jha, A K
Singh, I B
Keywords: Mild steel
X-Ray diffraction
Sol-gel alumina coating
Issue Date: May-2009
Publisher: CSIR
Abstract: Sol-gel alumina coating was developed on mild steel surface by using dip coating technique. Prior to the sol-gel coating, the substrate was treated with zinc-phosphating solution to improve the bonding of the coating. The corrosion resistance properties of the sol-gel alumina coated, uncoated and surface pre-treated substrates were evaluated in an artificial mine water solution. Electrochemical measurements like OCP<sub> </sub>variation with time, partial polarisation and electrochemical impedance analysis were carried out to evaluate corrosion resistance properties of the coatings. The microstructure and compositional analysis of the sol-gel coated specimens were investigated by SEM and XRD, respectively. The experimental results exhibited a significant improvement in the corrosion resistance of the sol-gel coated specimens as compared to the uncoated and surface pre-treated specimens. The SEM micrographs showed the presence of a compact coating of thickness 20 micron (approx). The XRD spectrum of the sol-gel coated specimens suggested the presence of <img src='/image/spc_char/alpha.gif'>-alumina phase in the coating.
Description: 216-220
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.16(3) [May 2009]

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