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Journal of Failure Analysis and Prevention

, Volume 8, Issue 1, pp 12–19 | Cite as

Effects of Inhibited Acid Cleaning of Steel Fracture Surfaces for Failure Analyses

  • Michael J. Mullen
  • Arthur H. Griebel
  • John M. Tartaglia
Feature—Peer-Reviewed

Abstract

To Clean Or Not To Clean? In many failure analyses, adherent rust limits the scope of the fracture surface examinations and presents dilemmas for the failure analyst. The rust must be removed to identify fracture initiation sites and crack propagation modes, and the cleaning methodology varies with service life and type of environmental exposure that the component experienced. In this study, failure analysts examined laboratory fracture samples in a scanning electron microscope (SEM). The fractures were then subjected to controlled rusting conditions, and subsequently varying exposures to inhibited acid were used to remove the rust. The fracture surfaces were again examined in the SEM, after rust removal. The ideal immersion time in the inhibited acid varied with the desired inspection. Although large fracture surface features remained visible after long cleaning times, fine features were damaged by even brief exposure to inhibited acid. However, inhibited acid cleaning is extremely helpful and remains the only means of obtaining useable fractographic results in many situations.

Keywords

Fracture surface Fractography Cleaning Oxide Rust Steel 

Notes

Acknowledgments

The authors gratefully acknowledge the optical and SEM picture contributions of Richard Frederick of Stork CRS, and Billy Lap Pun Chan and Peter Latta, former CRS co-op students from the University of British Columbia in Canada.

References

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    ASM Metals Handbook, 9th edn., Fractography, vol. 12, ASM International, Materials Park, Ohio, pp. 73–76Google Scholar
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    SlipLines, International Metallographic Society Newsletter, vol. 33, Issue 2, March 2005, ASM International, Materials Park, Ohio, p. 4Google Scholar

Copyright information

© ASM International 2007

Authors and Affiliations

  • Michael J. Mullen
    • 1
  • Arthur H. Griebel
    • 1
  • John M. Tartaglia
    • 1
  1. 1.Stork Climax Research Services, Inc.WixomUSA

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