SVET investigation into use of simple molybdate passivation treatments on electrodeposited zinc coatings

LEWIS, O. D., GREENFIELD, D., AKID, R., DAHM, R. H. and WILCOX, G. W. (2006). SVET investigation into use of simple molybdate passivation treatments on electrodeposited zinc coatings. Transactions of the Institute of Metal Finishing, 84 (4), 188-195.

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Link to published version:: 10.1179/174591906X124038

Abstract

Chromate replacement in passivation processes has formed the basis of much research, molybdates having already been studied as one entirely chromium free alternative. Molybdate conversion coatings from three different solutions have been examined using the scanning vibrating electrode technique (SVET) to determine whether molybdates are capable of 'self-repair', one of the beneficial features of chromates. Additionally, morphological studies and neutral salt spray corrosion tests have been used to characterise the samples. Chromate passivated samples have been used as the standard against which the molybdates have been assessed throughout the study. SVET line scans conducted over a period of ∼74 min suggest that molybdates are capable of some form of self-repair when damaged. However, the anodic potential perturbation during repassivation is larger than that observed with chromates.

Item Type: Article
Additional Information: © W.S. Maney & Son Ltd
Research Institute, Centre or Group: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number: 10.1179/174591906X124038
Depositing User: Ann Betterton
Date Deposited: 10 Jan 2008
Last Modified: 07 Oct 2010 10:47
URI: http://shura.shu.ac.uk/id/eprint/361

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