Corrosion protection of AA2024-T3 using rare earth diphenyl phosphates

Tracey Anne Markley, Maria Forsyth, Anthony E Hughes

Research output: Contribution to journalArticleResearchpeer-review

96 Citations (Scopus)

Abstract

Existing corrosion protection technologies for aluminium alloys utilising chromates are environmentally damaging and extremely toxic. This paper presents a preliminary investigation into rare earth diphenyl phosphates as new environmentally benign corrosion inhibitors. Full immersion weight loss experiments, cyclic potentiodynamic polarisation measurements and Raman spectroscopy were used in this study. Results show cerium diphenyl phosphate (Ce(dpp)(3)) acts as a cathodic inhibitor, decreasing cathodic current density and E-corr by passivating cathodic intermetallic particles on the alloy surface. Mischmetal diphenyl phosphate (Mm(dpp)(3)) acts a mixed inhibitor, shifting E-corr to more noble values, decreasing cathodic current density, increasing the breakdown potential and suppressing pitting. (c) 2006 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)4024 - 4031
Number of pages8
JournalElectrochimica Acta
Volume52
Issue number12
Publication statusPublished - 2007

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