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Characteristics of the Oxides Films formed on Alloy C-22

Published online by Cambridge University Press:  11 February 2011

Alan W. Szmodis ,
Kelly L. Anderson ,
Joseph C. Farmer ,
Tiangan Lian  and
Christine A. Orme
Alan W. Szmodis
Affiliation:
Lawrence Livermore National Laboratory, Chemistry and Material Science Division, Livermore, CA 94550
Kelly L. Anderson
Affiliation:
Lawrence Livermore National Laboratory, Chemistry and Material Science Division, Livermore, CA 94550
Joseph C. Farmer
Affiliation:
Lawrence Livermore National Laboratory, Chemistry and Material Science Division, Livermore, CA 94550
Tiangan Lian
Affiliation:
Lawrence Livermore National Laboratory, Chemistry and Material Science Division, Livermore, CA 94550
Christine A. Orme
Affiliation:
Lawrence Livermore National Laboratory, Chemistry and Material Science Division, Livermore, CA 94550
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Abstract

The passive corrosion rate of Alloy C-22 is exceptionally low in a wide range of aqueous solutions, temperatures and electrochemical potentials. Alloy C-22 contains approximately 22% chromium (Cr) by weight; thus, it forms a Cr-rich passive film in most environments. A study of the composition, thickness and other properties of the passive film was undertaken to better understand the role of the protective oxide in preventing corrosion. In general the oxide film is expected to be a function of solution pH, temperature and applied electrochemical potential. In this work we focus on the oxide films that form at pH=8.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II4.8
Copyright
Copyright © Materials Research Society 2003

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References

1. Annual Book of ASTM Standards, Volume 02.04 “Nonferrous Metals” (ASTM International, 2002: West Conshohocken, PA)Google Scholar
2. Annual Book of ASTM Standards, Volume 03.02 “Wear and Erosion; Metal Corrosion” (American Society for Testing and Materials, 2001: West Conshohocken, PA)Google Scholar