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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.

Record type: Article


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


Local EPrints ID: 22930
ISSN: 0020-2967
PURE UUID: 8f38f589-9356-4535-808a-203ca5d91d5f
ORCID for J.A. Wharton: ORCID iD

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Date deposited: 05 Feb 2007
Last modified: 17 Jul 2017 16:20

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Author: J.A. Wharton ORCID iD
Author: G.D. Wilcox
Author: K.R. Baldwin

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