An electrochemical evaluation of possible non-chromate conversion coating treatments for electrodeposited zinc-nickel alloys


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 Institute of Metal Finishing, 77, (4), pp. 152-158.

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Description/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.

Item Type: Article
ISSNs: 0020-2967 (print)
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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
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ePrint ID: 22930
Date :
Date Event
1999Published
Date Deposited: 05 Feb 2007
Last Modified: 16 Apr 2017 22:48
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/22930

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