Modeling pit initiation rate as a function of environment for Aluminum alloy 7075-T651

M. K. Cavanaugh, N. Birbilis, R. G. Buchheit

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Pit initiation in AA7075 was characterized by measuring metastable pits from potentiostatic testing. Environmental conditions included a range of temperatures (0-60°C), chloride concentration (0.01-0.6 M), electrolyte pH (2.5-10) and electrochemical potential (E). Metastable pit initiation rate, λ, was shown to have a dependence on all environmental variables, which is highly relevant to practical service. As a result of the wide variation in λ, an artificial neural network (ANN), rather than a deterministic model, was utilized to model λ as a function of environment. Additionally, the significant body of results herein sheds light on the general pitting characteristics of such high strength Al-alloys in a quantitative sense - whereby T, pH, and [Cl -] were all deemed significant parameters in accurately determining λ.

Original languageEnglish
Pages (from-to)336-345
Number of pages10
JournalElectrochimica Acta
Volume59
DOIs
StatePublished - Jan 1 2012

Keywords

  • 7xxx series
  • Aluminum alloys
  • Corrosion
  • Metastable pitting
  • Neural networks

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Electrochemistry

Fingerprint

Dive into the research topics of 'Modeling pit initiation rate as a function of environment for Aluminum alloy 7075-T651'. Together they form a unique fingerprint.

Cite this