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Surface Science Studies of the Effect of Mn2+ on Zinc Phosphating of 2024-T3 Al Alloy

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Abstract:

The present work is part of a broader investigation of the effects of additives in zinc phosphate (ZPO) coating solutions that are designed for specific applications to Al and its alloys. ZPO conversion coatings improve the corrosion resistance of the Al substrate and increase the adhesion of paint. Coatings formed on 2024-T3 aluminum alloy, after dipping in ZPO coating baths containing Mn2+, have been studied by X-ray photoelectron spectroscopy (XPS), SEM, and scanning Auger microscopy (SAM). Variations are observed in coating morphology and composition as the amount of Mn2+ in the coating solution increases through the 0 to 2500 ppm range. Adhesion tests give information on the relative strength of the coating-substrate interaction at different microstructural areas.

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Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

753-758

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.753

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Online since:

July 2006

Authors:

A.S. Akhtar, D. Susac, K.C. Wong, P.C. Wong, K.A.R. Mitchell

Keywords:

Aluminium Alloy, Auger Electron Spectroscopy (AES), Conversion Coating, Mn2+ Additive, Photoelectron Spectroscopy, Scanning Electron Microscope (SEM), Zinc Phosphate

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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