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Effect of Anions on the Fluoride Corrosion of Titanium-Grade 7

Published online by Cambridge University Press:  11 February 2011

A. L. Pulvirenti ,
K. M. Needham ,
M. A. Adel-Hadadi ,
D. S. Wong ,
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
D. S. Wong
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

The effects of chloride, sulfate, and nitrate on the fluoride ion local attack of Ti-Grade 7 (Ti-7: UNS R52400) were investigated. It was observed that a chloride: fluoride ratio of as high as 10 : 1 by mole was necessary to produce visible severe attack in immersion tests. Localized attack on Ti-7 was most severe at approximately 120°C, and at neutral pH. However, electrochemical studies detected that a narrowing of the passive region can occur at chloride: fluoride ratios as small as 1.1 : 1 by mole. The addition of sulfate did not significantly inhibit pitting or stress corrosion cracking of Ti-7 U-bends. However, the addition of nitrate is suspected to act as an effective inhibitor.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II4.12
Copyright
Copyright © Materials Research Society 2003

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References

REFERENCES

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