Corrosion of High-Density Sintered Tungsten Alloys. Part 3. Electrochemical Tests
Abstract
The corrosion behaviour of tungsten and high-density tungsten alloys (W greater than or equal to 90 weight %) has been examined electrochemically through anodic polarization measurements, instantaneous corrosion rate measurements, galvanic coupling, and surface potential mapping. In the anodic polarization tests, pure tungsten and the four alloys studied underwent transitions from an active state to a state where any further increase in potential produced no further increase in current. The presence of chloride ions increased corrosion rates. Predictions of likely trends in corrosion rates from the above electrochemical tests were not in complete agreement with those obtained by the long-term immersion tests. Similarly, a consistent prediction of the likely nature of the corrosion products that would result from long-term immersion testing was not obtained from the above studies. Predictions about which alloys would be susceptible to a crevice effect were in agreement with the immersion testing results, namely those alloys not containing Cu would be most susceptible. Australia.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1988
- Accession Number
- ADA205888
Entities
People
- B. S. Smith
- B. T. Moore
- J. J. Batten
- S. A. Bombaci
- W. N. Garrard
Organizations
- Defence Science and Technology Group