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Crosslinked Organic-Inorganic Hybrid Thin Films for Corrosion Resistance: Spectroscopic and Salt Spray Characterization

Published online by Cambridge University Press:  01 February 2011

Tammy L. Metrokeand  and
Edward T. Knobbe
Tammy L. Metrokeand
Affiliation:
Department of Chemistry and the Environmental Institute, Oklahoma State University, Stillwater, OK 74078
Edward T. Knobbe
Affiliation:
Department of Chemistry and the Environmental Institute, Oklahoma State University, Stillwater, OK 74078
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Abstract

Spray-coated, R-Si (OR')3 / TMOS (R = epoxide), thin films are being investigated as room temperature curing corrosion resistant coatings for 2024-T3 aluminum alloy. Solid state 1H-13C CP/MAS NMR indicates that primary aliphatic amines and super acids are effective crosslinkers for epoxide groups in aqueous ormosil systems. Incorporation of a crosslinking agent into the coating was found to reduce the cure time of the deposited film from >7 days to approximately 30 min. Accelerated salt spray and filiform corrosion resistance tests were conducted to determine the effects of crosslinking on the corrosion resistance behavior of ormosil thin films. The choice of curing agent was found to influence film structure and corrosion resistance properties. Amine cured thin films were hard and highly adherent to the aluminum alloy substrates, exhibiting excellent bare and filiform corrosion resistance, in addition to good compatibility with organic polymer paint systems. In contrast, the adhesion and corrosion resistance of super acid cured thin films to aluminum alloy substrates was significantly less, producing films which readily delaminated from the substrate. These observations can be related to the film structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 628: Symposium CC – Hybrid Organic/Inorganic Materials , 2000 , CC11.4
Copyright
Copyright © Materials Research Society 2000

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References

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