A comparison of the metastable pitting response of aluminium alloys

R. K. Gupta, B.R.W. Hinton, C. R. Hutchinson, N. Birbilis

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Aluminium and aluminium alloys are susceptible to pitting corrosion when exposed to most aqueous solutions. Stable pitting corrosion occurs above a critical potential known as the pitting potential (Epit), however, several studies have revealed that metastable pitting (viz. pit germination and metastable activity) can occur below the pitting potential of Al and its alloys. Each metastable pitting event is associated with a sharp increase in the current and therefore the number of such events can be quantified by analysis of transients as a function of time or potential. The metastable pitting response determined can be used for the quantification of subsequent pitting propensity of an alloy. In the present work, current transients collected upon pure Al and two Al alloys (AA2024-T3, AA5005-H34) are anlaysed and presented. Metastable pitting events were related to the microstructure of the alloys which also dictates the yield strength.

Original languageEnglish
Title of host publication18th International Corrosion Congress 2011
Subtitle of host publication20-24 November 2011; Perth, Australia
Place of PublicationBlackburn VIC Australia
PublisherAustralasian Corrosion Association
Number of pages7
ISBN (Print)9781618393630
Publication statusPublished - 2011
EventInternational Corrosion Congress 2011 - Perth Convention and Exhibition Centre, Perth, Australia
Duration: 20 Nov 201124 Nov 2011
Conference number: 18th


ConferenceInternational Corrosion Congress 2011
Abbreviated titleICC 2011
OtherThe 18th International Corrosion Congress took place between the 20th and the 24th November 2011 in the Perth Convention and Exhibition Centre, Australia. The International Corrosion Congress is the major event of the International Corrosion Council (ICC), an international body founded to advance corrosion science and engineering and is held once every three years by different host countries.


  • AA2024
  • AA5005
  • Aluminium
  • Corrosion
  • Metastable pitting
  • Passivity

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