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Some Effects of Microstructure and Chemistry on Corrosion and Hydrogen Embrittlement of Ticode–12*

Published online by Cambridge University Press:  21 February 2011

J. A. Ruppen ,
R. B. Diegle ,
R. S. Glass  and
T. J. Headley
J. A. Ruppen
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
R. B. Diegle
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
R. S. Glass
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
T. J. Headley
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
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Abstract

Effects of microstructure and chemistry on corrosion and hydrogen embrittlement of TiCode-12 have been investigated. Heat treating mill-annealed TiCode-12 in the temperature range 500–750°C results in a sensitization effect, i.e., an increase in the uniform corrosion rate when tested in either boiling 1N HCl or a MgCl2 brine. This effect is caused by microstructural changes involving the precipitation of Ti2Ni. Electrochemical studies indicate that sensitization results from galvanic coupling between Ti2Ni, acting as cathode, and the α-Ti matrix with resultant shifts in corrosion potential. Increasing the Fe content of the alloy promotes the sensitization effect.

Hydrogen embrittlement of TiCode-12 was studied using the slow strain rate technique. Hydrogen concentrations to 130 wppm did not cause embrittlement. However, above 220 wppm hydrogen, degradation was observed as a decrease in mechanical behavior and the appearance of cleavage-like secondary cracks. The embrittlement was dependent on temperature and alloy chemistry but not environment (air or brine).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 15: Symposium D – Scientific Basis for Nuclear Waste Management VI , 1982 , 685
Copyright
Copyright © Materials Research Society 1983

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Footnotes

*

This work performed at Sandia National Laboratories supported by the U.S. Department of Energy under contract number DE-AC04–76DP00789.

References

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