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An in Situ Small Angle Neutron Scattering Investigation of AgO.7Au0.3 Dealloying

Published online by Cambridge University Press:  22 February 2011

Sean G. Corcoran ,
David Wiesler ,
John Barker  and
Karl Sieradzki
Sean G. Corcoran
Affiliation:
Naval Research Laboratory, Chemistry Division, Code 6170, Washington, DC 20375
David Wiesler
Affiliation:
National Institute of Standards and Technology, Materials Science and Engineering Laboratory, Gaithersburg, MD 20899 Arizona State University, Department of Mechanical and Aerospace Engineering, Tempe, AZ 85287
John Barker
Affiliation:
National Institute of Standards and Technology, Materials Science and Engineering Laboratory, Gaithersburg, MD 20899
Karl Sieradzki
Affiliation:
Current address: George Washington University, Department of Physics, 725 21st street NW, Washington, D.C. 20074
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Abstract

In situ small angle neutron scattering (SANS) was used to characterize the formation of the random 3-dimensional porous structure created during the free corrosion of a Ag0.7Au0.3 alloy in concentrated HNO3. The evolution of the porosity was followed in situ for a period of 21 hours. The average ligament width evolved from a size of approximately 6 nm following only 7 minutes of dealloying to approximately 22.5 nm after 21 hours of de-alloying. Using a model developed by N.F. Berk (Phys. Rev. Lett., 58 (1987) 2718) for the scattering properties of random porous media, we were able to characterize the average ligament width distribution as a function of time. Our results represent the first in situ nanoscale characterization of the formation of 3-dimensional porosity in a corrosion system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 377
Copyright
Copyright © Materials Research Society 1995

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References

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