SEM and RBS characterization of a cobalt‐based conversion coating process on AA2024‐T3 and AA7075‐T6 | Zendy

Hughes A. E. | Zendy; Gorman J. | Zendy; Harvey T. G. | Zendy; McCulloch D. | Zendy; Toh S. K. | Zendy

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SEM and RBS characterization of a cobalt‐based conversion coating process on AA2024‐T3 and AA7075‐T6

Author(s) -

Hughes A. E.,

Gorman J.,

Harvey T. G.,

McCulloch D.,

Toh S. K.

Publication year - 2004

Publication title -

surface and interface analysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.52

H-Index - 90

eISSN - 1096-9918

pISSN - 0142-2421

DOI - 10.1002/sia.1986

Subject(s) - cobalt , materials science , coating , scanning electron microscope , conversion coating , transmission electron microscopy , metallurgy , alloy , aluminium , vanadium , x ray photoelectron spectroscopy , chemical engineering , composite material , nanotechnology , engineering

Samples of aluminium alloys AA2024‐T3 and AA7075‐T6 were treated with a chromate‐based deoxidizer, then conversion coated with a commercial cobalt‐based solution and finally sealed with a commercial vanadate‐based product. The alloy specimens were examined using scanning electron microscopy, transmission electron microscopy and Rutherford backscattering spectroscopy. The thickness of the cobalt‐based conversion coating increased rapidly up to 5 min of immersion but more slowly for longer times. Sealing resulted in penetration of vanadium through the oxide and a small increase in thickness due to the deposition of a thin sealing coating within the pores and on the external surface of the cobalt‐containing coating. Copyright © 2004 John Wiley & Sons, Ltd.

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