Corrosion Behavior of Metal Matrix Composites

Abstract

A research program was conducted to assess the corrosion behavior of two categories of copper metal matrix composites; commercially available composites and composites in development. The commercially available composite studied was dispersion strengthened copper (2.7 vol % Al2O3/Cu) which was found to possess comparable corrosion resistance to copper. In addition, it did not appear to be susceptible to stress corrosion cracking when U-bend specimens were tested in 3.5 wt % NaCl or artificial seawater for a period of 4 months. Stress corrosion cracking was also not observed under proof ring loading in 3.5 wt % NaCl for a period of 8 months at an applied stress of 95% of the yield stress. The composites in development studied were HEHR Gr (sub p) Cu composites containing 1.2, 5, 15, 25 and 40 vol % graphite; 50 vol % GR (sub f) Cu; and 70 vol % W (sub f) Cu. These composites experienced varying degrees of galvanic corrosion during polarization. Benzotriazole, however, offers excellent potential as a corrosion inhibitor for these composites.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1993
Accession Number
ADA265352

Entities

People

  • Harovel G. Wheat

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Composite Materials
  • Copper
  • Corrosion
  • Corrosion Resistance
  • Crystal Structure
  • Galvanic Corrosion
  • Graphitic Materials
  • Material Degradation Processes
  • Materials
  • Materials Science
  • Mechanical Properties
  • Metal Matrix Composites
  • Resistance
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Three Dimensional

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials