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Measurement of the Nickel/Nickel Oxide Phase Transition in High Temperature Hydrogenated Water Using the Contact Electric Resistance (CER) Technique.

DE2004821680

Publication Date	2001
Personal Author	Attanasio, S. A.; Morton, D. S.; Ando, M. A.; Panayotou, N. F.; Thompson, C. D.
Page Count	16
Abstract	Prior studies of Alloy 600 and Alloy X-750 have shown the existence of a maximum in stress corrosion cracking (SCC) susceptibility in high temperature water (e.g., at 360 degrees C), when testing is conducted over a range of dissolved (i.e., aqueous) hydrogen (H(sub 2)) concentrations. It has also been shown that this maximum in SCC susceptibility tends to occur in proximity to the nickel/nickel oxide (Ni/NiO) phase transition, suggesting that oxide phase stability may affect primary water SCC (PWSCC) resistance. Previous studies have estimated the Ni/NiO transition using thermodynamic calculations based on free energies of formation for NiO and H(sub 2)O. The present study reports experimental measurements of the Ni/NiO transition performed using a contact electric resistance (CER) instrument.
Keywords	Nickel alloys Hydrogen Chemistry Oxides Electric conductivity Phase stability Stress corrosion Testing Thermodynamics Water Cracking(Fracturing)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lockheed Martin Electronics Labs., Syracuse, NY.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200417

Measurement of the Nickel/Nickel Oxide Phase Transition in High Temperature Hydrogenated Water Using the Contact Electric Resistance (CER) Technique.

Measurement of the Nickel/Nickel Oxide Phase Transition in High Temperature Hydrogenated Water Using the Contact Electric Resistance (CER) Technique.
DE2004821680

Publication Date	2001
Personal Author	Attanasio, S. A.; Morton, D. S.; Ando, M. A.; Panayotou, N. F.; Thompson, C. D.
Page Count	16
Abstract	Prior studies of Alloy 600 and Alloy X-750 have shown the existence of a maximum in stress corrosion cracking (SCC) susceptibility in high temperature water (e.g., at 360 degrees C), when testing is conducted over a range of dissolved (i.e., aqueous) hydrogen (H(sub 2)) concentrations. It has also been shown that this maximum in SCC susceptibility tends to occur in proximity to the nickel/nickel oxide (Ni/NiO) phase transition, suggesting that oxide phase stability may affect primary water SCC (PWSCC) resistance. Previous studies have estimated the Ni/NiO transition using thermodynamic calculations based on free energies of formation for NiO and H(sub 2)O. The present study reports experimental measurements of the Ni/NiO transition performed using a contact electric resistance (CER) instrument.
Keywords	Nickel alloys Hydrogen Chemistry Oxides Electric conductivity Phase stability Stress corrosion Testing Thermodynamics Water Cracking(Fracturing)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lockheed Martin Electronics Labs., Syracuse, NY.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200417