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Influence of praseodymium - synergistic corrosion inhibition in mixed rare-earth diphenyl phosphate systems
journal contributionposted on 01.01.2007, 00:00 authored by T Markley, A Hughes, T Ang, G Deacon, P Junk, Maria ForsythMaria Forsyth
Mixed rare-earth organophosphates have been investigated as potential corrosion inhibitors for AA2024-T3, and previously have shown synergistic inhibition behavior; however, the mechanism was not identified. In this paper, a key factor contributing to corrosion inhibition of AA2024-T3 with mischmetal diphenyl phosphate [Mm(dpp)3] is the unique stability of Pr(dpp)3 compared to other key rare earths in mischmetal. Although increasing pH causes precipitation of other components, the Pr compound is stable at higher pH. Electrochemically, a synergy is evident when Ce(dpp)3 and Pr(dpp)3 are combined. Raman mapping indicates the Pr(dpp)3 inhibitor leads to a more uniform coverage of the alloy.
JournalElectrochemical and solid-state letters
LocationPennington, N. J.
Publication classificationC1.1 Refereed article in a scholarly journal
Copyright notice2007, Electrochemical Society
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cerium compoundscorrosion inhibitorsorganic compoundspHpraseodymium compoundsprecipitationRaman spectraScience & TechnologyPhysical SciencesTechnologyElectrochemistryMaterials Science, MultidisciplinaryMaterials ScienceALUMINUM-ALLOYCONVERSION COATINGSLOCALIZED CORROSIONCERIUMPROTECTIONAA2024-T3CHROMATE