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Corrosion inhibition of 7000 series aluminium alloys with cerium diphenyl phosphate

journal contribution
posted on 03.02.2011, 00:00 authored by J A Hill, T Markley, Maria ForsythMaria Forsyth, Patrick HowlettPatrick Howlett, Bruce HintonBruce Hinton
Cerium diphenyl phosphate (Ce(dpp)3) has previously been shown to be a strong corrosion inhibitor for aluminium-copper magnesium alloy AA2024-T3 and AA7075 in chloride solutions. Surface characterisation including SEM and ToF-SIMS coupled with electrochemical impedance spectroscopy (EIS) measurements are used to propose a mechanism of corrosion inhibition which appears to involve the formation of a complex oxide film of aluminium and cerium also incorporating the organophosphate component. The formation of a thin complex film consisting of hydrolysis products of the Ce(dpp)3 compound and aluminium oxide is proposed to lead to the observed inhibition. SEM analysis shows that some intermetallics favour the creation of thicker deposits predominantly containing cerium oxide compounds.

History

Journal

Journal of alloys and compounds

Volume

509

Issue

5

Pagination

1683 - 1690

Publisher

Elsevier BV

Location

Amsterdam, The Netherlands

ISSN

0925-8388

eISSN

1873-4669

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2010, Elsevier B.V.