Corrosion Performance of Nano-Alumina Coatings over Anodized Aluminum Alloy by Dip Coating Method


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Resumo

Alumina coatings are widely used to enhance the wear, abrasion, and corrosion resistance of metal components. This investigation aims at studying the alumina sol-gel coating on the anodized aluminum alloy surface using a dip coating technique. A stable alumina coating was deposited over the anodized aluminum surface using oxime-modified aluminum(III) isopropoxide as sol-gel precursor. The scanning electron microscopy image of the coated anodized sample suggests deposition of a uniform and crack-free aluminum coating. The corrosion resistances of bare, anodized, and coated anodized aluminum alloy samples were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization in 3.5 wt % aqueous NaCl solution. An appreciable shifting was observed in the equilibrium corrosion potential (Ecorr) and the corrosion current density (icorr) values of both anodized and coated anodized samples: i.e. Ecorr: from –1377.11 mV (anodized) to –711.54 mV (coated anodized) and icorr: from 80.37 μA/cm2 (anodized) to 0.090 μA/cm2 (coated anodized). The results clearly indicate the corrosion resistive behavior of nano-alumina coatings.

Sobre autores

Dalip Singh

School of Automobile Mechanical and Mechatronics, Manipal University

Email: dhayal21v@gmail.com
Índia, Jaipur, 303007

Veena Dhayal

Department of Chemistry, Manipal University

Autor responsável pela correspondência
Email: dhayal21v@gmail.com
Índia, Jaipur, 303007

Dinesh Chandra Agarwal

National Institute for Research and Development in Defence Shipbuilding (NIRDESH)

Email: dhayal21v@gmail.com
Índia, New Delhi

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