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Effects of Fluoride and Chloride Ions on Corrosion of Titanium Grade 7 in Concentrated Groundwaters

Published online by Cambridge University Press:  21 March 2011

A. L. Pulvirenti ,
K. M. Needham ,
M. A. Adel-Hadadi  and
A. Barkatt
A. L. Pulvirenti
Affiliation:
The Catholic University of America, Washington DC, 20064 C. Marks and J. Gorman, Dominion Engineering, Inc. 6862 Elm Street Suite 460, MacLean, VA, 22101
K. M. Needham
Affiliation:
The Catholic University of America, Washington DC, 20064 C. Marks and J. Gorman, Dominion Engineering, Inc. 6862 Elm Street Suite 460, MacLean, VA, 22101
M. A. Adel-Hadadi
Affiliation:
The Catholic University of America, Washington DC, 20064 C. Marks and J. Gorman, Dominion Engineering, Inc. 6862 Elm Street Suite 460, MacLean, VA, 22101
A. Barkatt
Affiliation:
The Catholic University of America, Washington DC, 20064 C. Marks and J. Gorman, Dominion Engineering, Inc. 6862 Elm Street Suite 460, MacLean, VA, 22101
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Abstract

Titanium Grade 7 (Ti-7) was tested for both general and local corrosion in environments consisting of fluoride and chloride salts added to simulated groundwaters. Tests were conducted on both U-bends and disks in order to determine the extent of corrosion under stressed and unstressed conditions. The experiments were run over a broad range of temperatures and pH values for periods of up to 164 days. It was found that Ti-7 is susceptible to intergranular attack in some of the test solutions at moderately elevated temperatures, leading to conspicuous localized corrosion. Pitting was detected within 14 days, with pit depths on the order of 0.1 mm. Surface defects appeared to promote the initiation of pitting. The same environment caused stress corrosion cracking failure in a statically stressed U-bend.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ1.9
Copyright
Copyright © Materials Research Society 2002

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