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Observation of Localized Corrosion of Ni-Based Alloys Using Coupled Orientation Imaging Microscopy and Atomic Force Microscopy

Published online by Cambridge University Press:  10 February 2011

Peter J. Bedrossian ,
Adam J. Schwartz ,
Mukul Kumar  and
Wayne E. King
Peter J. Bedrossian
Affiliation:
Chemistry and Materials Science Directorate, University of California, Lawrence Livermore National Laboratory, Livermore CA 94551
Adam J. Schwartz
Affiliation:
Chemistry and Materials Science Directorate, University of California, Lawrence Livermore National Laboratory, Livermore CA 94551
Mukul Kumar
Affiliation:
Chemistry and Materials Science Directorate, University of California, Lawrence Livermore National Laboratory, Livermore CA 94551
Wayne E. King
Affiliation:
Chemistry and Materials Science Directorate, University of California, Lawrence Livermore National Laboratory, Livermore CA 94551
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Abstract

We present a method for assessing the relative vulnerabilites of distinct classes of grain boundaries to localized corrosion. Orientation imaging microscopy provides a spatial map which identifies and classifies grain boundaries at a metal surface. Once the microstructure of a region of a sample surface has been characterized, a sample can be exposed to repeated cycles of exposure to a corrosive environment alternating with topographic measurement by an atomic force microscope in the same region in which the microstructure had been mapped. When this procedure is applied to Ni and Ni-based alloys, we observe enhanced attack at random grain boundaries relative to special boundaries and twins in a variety of environments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 586: Symposium M – Interfacial Engineering for Optimized Properties II , 1999 , 81
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

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4. The compositions of these alloys are given in Davis, J., et al., ed, ASM Handbook Volume 13: Corrosion, ASM International, Metals Park, OH, 1987, p. 664.Google Scholar