Corrosion inhibition of 7000 series aluminium alloys with cerium diphenyl phosphate

Julie Anne Hill, Tracey Markley, Maria Forsyth, Patrick C. Howlett, Bruce R W Hinton

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67 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1683-1690
Number of pages8
JournalJournal of Alloys and Compounds
Volume509
Issue number5
DOIs
Publication statusPublished - 3 Feb 2011

Keywords

  • Aluminium alloys
  • Cerium
  • Corrosion
  • Corrosion inhibitors
  • Diphenylphosphate
  • Scanning electron microscopy
  • Surface characterisation metals and alloys
  • Surfaces and interfaces

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