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Effects of Fluoride and other Anions on the Corrosion of Alloy 22

Published online by Cambridge University Press:  11 February 2011

A. L. Pulvirenti ,
K. M. Needham ,
M. A. Adel-Hadadi ,
A. Barkatt ,
C. R. Marks  and
J. A. Gorman
A. L. Pulvirenti
Affiliation:
The Catholic University of America, Washington, D.C. 20064
K. M. Needham
Affiliation:
The Catholic University of America, Washington, D.C. 20064
M. A. Adel-Hadadi
Affiliation:
The Catholic University of America, Washington, D.C. 20064
A. Barkatt
Affiliation:
The Catholic University of America, Washington, D.C. 20064
C. R. Marks
Affiliation:
Dominion Engineering, Inc., 11730 Plaza America Drive Reston, VA 20190
J. A. Gorman
Affiliation:
Dominion Engineering, Inc., 11730 Plaza America Drive Reston, VA 20190
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Abstract

Samples of Alloy 22 were tested in solutions containing various anions in order to determine their effect on the corrosion of the alloy. It was found that Alloy 22 is relatively corrosion resistant in HCl and HNO3 at pH 1 and 160°C (general corrosion rates on the order of 10 μm/year), but more susceptible to phosphoric acid, especially under reducing conditions. The presence of fluoride raised the corrosion rate of Alloy 22 to the order 1 mm/year at pH 1, and fluoride is still active towards Alloy 22 at pH levels as high as 3.5. Samples tested in solutions of 1000xJ13 in which the pH was altered during testing showed an increase in corrosion rate over solutions of constant pH. Preliminary electrochemical tests suggest that nitrate may be an effective corrosion inhibitor in fluoride containing solutions, while sulfate is not.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II4.6
Copyright
Copyright © Materials Research Society 2003

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References

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