Corrosion Behavior of Aluminum-Lithium Alloys

Abstract

Corrosion behavior of three aluminum-lithium (Al-Li) alloys was investigated in aerated 0.5 M sodium sulfate (Na2SO4), deaerated 3.5% sodium chloride (NaCl), and aerated 3.5% NaCl. Corrosion behavior of the Aluminum Association (AA) alloys 2090-T8E41 (UNS A92090, sheet), AA 8090-T851 (UNS a98090, sheet), and AA 8090-T82551 (UNS A98090, bar) was compared to behavior of the conventional AA 7075T6 (UNS A97075, sheet). Uniform corrosion was the predominant form of attack in aerated Na2SO4, and deaerated NaCl, although some localized attack resulted from corrosion of intermetallics on specimen surfaces. Pitting was the main form of attack in aerated NaCl. In all three media, the sheet materials corroded at a similar rate, but the bar form of AA 8090 corroded at a lower rate. Pretreatment of the alloys by immersion in a cerium (Ce) solution inhibited pitting in aerated NaCl but only for a short period.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1994
Accession Number
ADA283797

Entities

People

  • W. N. Garrard

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Australia
  • Body Weight
  • Boundaries
  • Capacitance
  • Chlorides
  • Computers
  • Elements
  • Environment
  • Equations
  • Equivalent Circuits
  • Experimental Data
  • Lithium Alloys
  • Materials
  • Resistance
  • Silicon Carbide
  • Sodium Compounds
  • Standards

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.