Corrosion of Graphite Aluminum Metal Matrix Composites

Abstract

Several commercial G/Al MMCs have been studied by potentiodynamic polarization in deaerated 0.5 M Na2SO4. The results have been compared with those which were predicted by the mixed electrode theory. The results indicate that processing conditions, especially the cooling rate, had a strong influence on the corrosion behavior of the G/Al MMCs. Large scale G/Al model MMCs were fabricated at MIT in order to study the corrosion behavior of G/Al galvanic couples with the scanning potential microprobe (SPM). Preliminary results indicate that coating graphite with discontinuous alumina did not reduce the corrosion rate of the G/Al galvanic couple. Ion implanting the surface of G/Al model MMCs with zinc, a cathodic inhibitor, did reduce the corrosion G/Al galvanic couple; however, the protection was incomplete.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1991
Accession Number
ADA234322

Entities

People

  • J. F. Chiang
  • L. H. Hihara
  • M. A. Buonanno
  • R. M. Latanision

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Cyber
  • Space

DTIC Thesaurus Topics

  • Aluminum
  • Chemistry
  • Composite Material Fabrication
  • Composite Materials
  • Corrosion Resistance
  • Fabrication
  • Galvanic Corrosion
  • Inhibitors
  • Ion Implantation
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Metal Matrix Composites
  • Metallurgy
  • Metals

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials