Journal of Failure Analysis and Prevention

, Volume 4, Issue 6, pp 19–22 | Cite as

Intergranular corrosion of a light aircraft aluminum alloy propeller

  • A. A. Johnson
  • R. J. Storey
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Abstract

Examination of the wreckage of a light aircraft revealed that approximately 20 cm was missing from one tip of the aluminum alloy propeller. Fractographic and metallographic examination of the remaining portion of the propeller revealed extensive grain-boundary separation in the vicinity of the fracture, and grain edges and corners rounded by corrosion on the fracture surface. Energy dispersive X-ray analysis (EDXA) revealed fluorine on, and in the vicinity of, the fracture surface. In the ensuing litigation, it was asserted that the crash occurred because the propeller fractured in flight as the result of intergranular attack caused by the use of a fluorine-bearing cleaner.

Keywords

aluminum alloy intergranular corrosion propeller 

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References

  1. 1.
    National Transportation Safety Board, Report NYC 99FA236, Sept 28, 1999.Google Scholar
  2. 2.
    J.R. Davis, Ed.: Aluminum and Aluminum Alloys, ASM Specialty Handbook, ASM International, 1993.Google Scholar
  3. 3.
    J.R. Davis, ed.: Corrosion of Aluminum and Aluminum Alloys, ASM International, 1999, Chap. 4.Google Scholar
  4. 4.
    D.A. Jones: Principles and Prevention of Corrosion, Macmillan, New York, 1992, Chap. 9.Google Scholar
  5. 5.
    R.J. Frick and A.A. Johnson: “A New Fracture Mode in an Aluminum-Zinc Alloy,” Microstruct. Sci., 1976, 4, pp. 263–68.Google Scholar

Copyright information

© ASM International 2004

Authors and Affiliations

  • A. A. Johnson
    • 1
  • R. J. Storey
    • 1
  1. 1.Metals Research Inc.Louisville

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