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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.