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Particle-Doped Organic-Inorganic Hybrid Coatings as Corrosion Inhibiting Surface Treatments for Aluminum Alloys

Published online by Cambridge University Press:  01 February 2011

Tammy L. Metroke ,
Olga Kachurina  and
Edward T. Knobbe
Tammy L. Metroke
Affiliation:
Oklahoma State University, Environmental Institute, 003 Life Sciences East, Stillwater, OK 74075
Olga Kachurina
Affiliation:
Oklahoma State University, Environmental Institute, 003 Life Sciences East, Stillwater, OK 74075
Edward T. Knobbe
Affiliation:
Oklahoma State University, Environmental Institute, 003 Life Sciences East, Stillwater, OK 74075
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Abstract

Organically-modified silicate (Ormosil) films have been found to provide good corrosion resistance for metal substrates and are potential replacement systems for hexavalent chromiumbased conversion coatings. Significant enhancement in corrosion resistance properties were observed upon addition of sub-micron to micron-sized particles (TiO2, Al2O3, SiN, TiN) to the Ormosil coating as determined using accelerated salt spray and electrochemical analysis. Rcorr values derived from potentiodynamic polarization curves were found to increase from 1520 to (3800 - 4680) kΩcm2 upon addition of various concentrations of TiO2, Al2O3, SiN or TiN particles to the Ormosil thin film. Similarly, Epit values were found to range from +0.2 V for the non-doped Ormosil to (0.6 – 1.9) V for particle-doped Ormosil thin films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 726: Symposium Q – Hybrid Organic-Inorganic Materials , 2002 , Q12.3
Copyright
Copyright © Materials Research Society 2002

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