Corrosion Behavior of High Density Tungsten Alloys

Abstract

The corrosion behavior of high density tungsten alloys has been examined by electrochemical potentiostatic polarization methods and weight loss measurements in full immersion tests. Electrochemical tests were carried out in aqueous solutions, buffered to pH 4, 9, 12 with and without 0.1M sodium chloride and immersion tests in 5% NaCL solution. Pure tungsten and all the alloys studied undergo active-passive transitions and corrosion rates increase with increasing pH. The chloride ion generally increases corrosion rates slightly, but in pH12 solution, the chloride ion inhibits the anodic reaction to some extent. A 97N-2Ni-0.7Fe-0-3Co alloy was found to be the most corrosion resistant in solutions containing chloride ions. The data also suggests that copper as an alloying element accelerates corrosion of tungsten alloys in NaCL solution. Both general dissolution and localized attack at grain boundaries were observed.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1987
Accession Number
ADA187108

Entities

People

  • Frank C. Chang
  • Milton Levy

Tags

Communities of Interest

  • Advanced Electronics
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Body Weight
  • Chemistry
  • Corrosion Resistance
  • Current Density
  • Elements
  • Engineering
  • Grain Boundaries
  • High Density
  • Information Processing
  • Materials
  • Metals
  • Military Research
  • Plastic Explosives
  • Powders
  • Resistance
  • Tungsten Alloys

Fields of Study

  • Materials science

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.