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Recent developments in corrosion inhibitors based on rare earth metal compounds

journal contribution
posted on 01.01.2014, 00:00 authored by Maria ForsythMaria Forsyth, Marianne Seter, Mike Yongjun TanMike Yongjun Tan, Bruce HintonBruce Hinton
Rare earth organic compounds can provide an environmentally safe and non-toxic alternative to chromates as corrosion inhibitors for some steel and aluminium applications. For steel lanthanum 4-hydroxy cinnamate offers corrosion protection and reduces the susceptibility to hydrogen embrittlement. Recent work has also indicated that it inhibits the corrosion of steel in environments containing high levels of carbon dioxide. For aluminium alloys, cerium diphenyl phosphate provides excellent corrosion inhibition in chloride environments, and reduces susceptibly to stress corrosion cracking. Furthermore, for both steel and aluminium alloys filiform corrosion can be suppressed when rare earth inhibitor compounds are added as pigments to polymer coatings. The levels of inhibition observed are thought to be due to synergistic effects between the rare earth and organic parts of these novel compounds, and are related to the various species that may be present in the complex chemical conditions that develop in solution close to a metal surface. This paper reviews some of the published research conducted by the group at Deakin University over recent years.©2014 Institute of Materials, Minerals and Mining.

History

Journal

Corrosion Engineering Science and Technology

Volume

49

Issue

2

Pagination

130 - 135

ISSN

1478-422X

eISSN

1743-2782

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2014, Maney Publishing