An electrochemical evaluation of possible non-chromate conversion coating treatments for electrodeposited zinc-nickel alloys
An electrochemical evaluation of possible non-chromate conversion coating treatments for electrodeposited zinc-nickel alloys
A number of possible non-chromate conversion coating formulations have been studied to examine their efficacy as replacements for chromate-based coating treatments on electrodeposited zinc-nickel alloys. Data have been collected from both electrochemical and conventional salt fog corrosion tests. In the latter tests all the alternative non-chromate systems studied delayed the onset of the corrosion of the zinc-nickel coating itself but only the simple molybdate and the permanganate/molybdate dual treatment brought about improvements in times to red rusting of the steel substrate. The electrochemical evaluations suggested that simple molybdate-treated surfaces act as only moderate barriers to the chloride environments. Of the two dual treatments, permanganate/molybdate behaved similarly to the simple molybdate treated surfaces in the electrochemical tests, but the molybdate/permanganate was more protective, although this was not exhibited in the salt fog corrosion tests.
conversion coating, electrodeposition, metal coating, zinc plating, materials replacement, corrosion resistance, molybdates, permanganates, galvanized steel, carbon steel, zinc base alloys, surface treatment, corrosion potential, sodium chloride, nickel alloy
152-158
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Wilcox, G.D.
0c96bc8e-9830-4ddb-b6c7-3b6965d6ae0a
Baldwin, K.R.
1fbb749c-51c1-4b02-a16b-5c125f5f6645
1999
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Wilcox, G.D.
0c96bc8e-9830-4ddb-b6c7-3b6965d6ae0a
Baldwin, K.R.
1fbb749c-51c1-4b02-a16b-5c125f5f6645
Wharton, J.A., Wilcox, G.D. and Baldwin, K.R.
(1999)
An electrochemical evaluation of possible non-chromate conversion coating treatments for electrodeposited zinc-nickel alloys.
Transactions of the IMF, 77 (4), .
Abstract
A number of possible non-chromate conversion coating formulations have been studied to examine their efficacy as replacements for chromate-based coating treatments on electrodeposited zinc-nickel alloys. Data have been collected from both electrochemical and conventional salt fog corrosion tests. In the latter tests all the alternative non-chromate systems studied delayed the onset of the corrosion of the zinc-nickel coating itself but only the simple molybdate and the permanganate/molybdate dual treatment brought about improvements in times to red rusting of the steel substrate. The electrochemical evaluations suggested that simple molybdate-treated surfaces act as only moderate barriers to the chloride environments. Of the two dual treatments, permanganate/molybdate behaved similarly to the simple molybdate treated surfaces in the electrochemical tests, but the molybdate/permanganate was more protective, although this was not exhibited in the salt fog corrosion tests.
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Published date: 1999
Keywords:
conversion coating, electrodeposition, metal coating, zinc plating, materials replacement, corrosion resistance, molybdates, permanganates, galvanized steel, carbon steel, zinc base alloys, surface treatment, corrosion potential, sodium chloride, nickel alloy
Identifiers
Local EPrints ID: 22930
URI: http://eprints.soton.ac.uk/id/eprint/22930
ISSN: 0020-2967
PURE UUID: 8f38f589-9356-4535-808a-203ca5d91d5f
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Date deposited: 05 Feb 2007
Last modified: 08 Jan 2022 02:47
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Author:
G.D. Wilcox
Author:
K.R. Baldwin
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