An EXAFS investigation of molybdate-based conversion coatings
An EXAFS investigation of molybdate-based conversion coatings
The composition of molybdate-based conversion coatings on zinc–nickel alloy electrodeposits was examined by extended X-ray absorption fine structure (EXAFS). The absorption spectra from appropriate standards showed distinct differences between the Mo(IV) and Mo(VI) oxidation states. A pre-edge peak was apparent for the various molybdate species and molybdenum trioxide, with the energy and intensity dependent on the coordination of the molybdenum. A shift in the molybdenum K-edge spectra was also evident between Mo(IV) and Mo(VI) compounds. A qualitative analysis revealed that both Mo(IV) and Mo(VI) species were present within the molybdate-based conversion coating, with a significant prevalence of hexavalent molybdenum.
chromate-replacement, conversion coatings, exafs, molybdate, passivation, zinc–nickel alloy
553-561
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Ross, D.H.
4ab3060e-30a7-4ba4-942a-fe29dc64f04f
Treacy, G.M.
5edf1780-7dcb-48b7-b04f-5e6f35b7dc0e
Wilcox, G.D.
0c96bc8e-9830-4ddb-b6c7-3b6965d6ae0a
Baldwin, K.R.
1fbb749c-51c1-4b02-a16b-5c125f5f6645
2003
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Ross, D.H.
4ab3060e-30a7-4ba4-942a-fe29dc64f04f
Treacy, G.M.
5edf1780-7dcb-48b7-b04f-5e6f35b7dc0e
Wilcox, G.D.
0c96bc8e-9830-4ddb-b6c7-3b6965d6ae0a
Baldwin, K.R.
1fbb749c-51c1-4b02-a16b-5c125f5f6645
Wharton, J.A., Ross, D.H., Treacy, G.M., Wilcox, G.D. and Baldwin, K.R.
(2003)
An EXAFS investigation of molybdate-based conversion coatings.
Journal of Applied Electrochemistry, 33, .
Abstract
The composition of molybdate-based conversion coatings on zinc–nickel alloy electrodeposits was examined by extended X-ray absorption fine structure (EXAFS). The absorption spectra from appropriate standards showed distinct differences between the Mo(IV) and Mo(VI) oxidation states. A pre-edge peak was apparent for the various molybdate species and molybdenum trioxide, with the energy and intensity dependent on the coordination of the molybdenum. A shift in the molybdenum K-edge spectra was also evident between Mo(IV) and Mo(VI) compounds. A qualitative analysis revealed that both Mo(IV) and Mo(VI) species were present within the molybdate-based conversion coating, with a significant prevalence of hexavalent molybdenum.
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Published date: 2003
Keywords:
chromate-replacement, conversion coatings, exafs, molybdate, passivation, zinc–nickel alloy
Identifiers
Local EPrints ID: 22462
URI: http://eprints.soton.ac.uk/id/eprint/22462
PURE UUID: 8f634f56-e87d-44ba-9506-0a1d79e4b4ec
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Date deposited: 21 Mar 2006
Last modified: 09 Jan 2022 02:56
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Contributors
Author:
D.H. Ross
Author:
G.M. Treacy
Author:
G.D. Wilcox
Author:
K.R. Baldwin
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