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New 'green' corrosion inhibitors based on rare earth compounds

journal contribution
posted on 01.01.2011, 00:00 authored by Maria ForsythMaria Forsyth, Marianne Seter, Bruce HintonBruce Hinton, G Deacon, P Junk
A series of rare earth organic compounds pioneered by our group have been shown to provide a viable alternative to theuse of chromates as corrosion inhibitors for some steel and aluminium applications. For example we have shown thatthe lanthanum 4-hydroxy cinnamate offers excellent corrosion mitigation for mild steel in aqueous environments whilerare earth diphenyl phosphates offer the best protection in the case of aluminium alloys. In both cases the protectionappears to be related to the formation of a nanometre thick interphase occurring on the surface that reduces theelectrochemical processes leading to metal loss or pitting. Very recent work has indicated that we may even be able toaddress the challenging issue of stress corrosion cracking of high strength steels. Furthermore, filiform corrosion can besuppressed when selected rare earth inhibitor compounds are added as pigments to a polymer coating. There is little doubtfrom the work thus far that a synergy exists between the rare earth and organic inhibitor components in these novelcompounds. This paper reviews some of the published research conducted by the senior author and colleagues over the past10 years in this developing field of green corrosion inhibitors

History

Journal

Australian journal of chemistry

Volume

64

Issue

6

Pagination

812 - 819

Publisher

CSIRO

Location

Collingwood, VIC.

ISSN

0004-9425

eISSN

1445-0038

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2011, CSIRO