The effect of CeCl3 as an inhibitor on the localized corrosion of AA2024-T3 as a function of temperature

Jichao Li, Belinda Hurley, Rudolph Buchheit

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Cerium inhibition of localized corrosion of AA2024-T3 as a function of temperature is evaluated based on the electrochemical characteristics of synthesized intermetallic compounds (IMCs) using a microcell method. Corrosion morphology studies of secondary phase particles in AA2024-T3 subjected to similar conditions are also presented. In a 4 mM Ce3+-containing solution, the anodic characteristics of IMCs are similar to those in a NaCl solution without any inhibitors at all temperatures tested, indicating Ce3+ is not an effective anodic inhibitor. Strong suppression of cathodic kinetics occurring on IMCs is observed in the presence of Ce3+ at all test temperatures. The inhibition efficiencies on cathodic reactions are similar at 30 and 50°C, but become weaker at 70°C. Electrochemical analysis indicates that inhibition provided by Ce3+ depends on the kinetics of local pH increases and the subsequent formation of Ce hydroxide on the surface, making Ce a slow inhibitor. The sluggish inhibition kinetics are amplified at high temperature (>50°C). The initial dealloying corrosion of S-phase cannot be inhibited at ambient temperatures. This effect becomes more severe at high temperature (>50°C). Trenching corrosion around Al-Cu-Mn-Fe type particles can be well suppressed with addition of Ce3+ at temperatures up to 50°C.

Original languageEnglish
Pages (from-to)C845-C852
JournalJournal of the Electrochemical Society
Volume163
Issue number14
DOIs
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© The Author(s) 2016. Published by ECS. All rights reserved.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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