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

Title

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

Creator

• Author: Attanasio, S. A.
  Creator Type: Personal
• Author: Morton, D. S.
  Creator Type: Personal
• Author: Ando, M. A.
  Creator Type: Personal
• Author: Panayotou, N. F.
  Creator Type: Personal
• Author: Thompson, C. D.
  Creator Type: Personal

Contributor

• Sponsor: United States. Department of Energy.
  Contributor Type: Organization
  Contributor Info: US Department of Energy (United States)

Publisher

• Name: Lockheed Martin
  Place of Publication: Schenectady, New York
  Additional Info: Lockheed Martin Corporation, Schenectady, NY 12301 (United States)

Date

• Creation: 2001-05-08

Language

• English

Description

• Content Description: 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 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. The CER is capable of measuring the surface resistance of a metal to determine whether it is oxide-covered or oxide-free at a given condition. The transition aqueous hydrogen (H{sub 2}) concentration corresponding to the Ni/NiO equilibrium was measured at 288, 316, 338 and 360 C using high purity Ni specimens. The results showed an appreciable deviation (i.e., 7 to 58 scc H{sub 2}/kg H{sub 2}O) between the measured Ni/NiO transition and the theoretical Ni/NiO transition previously calculated using free energy data from the Journal of Solution Chemistry. The CER-measured position of the Ni/NiO transition is in good agreement with the maxima in PWSCC susceptibility at 338 and 360 C. The measured Ni/NiO transition provides a reasonable basis for estimating the aqueous H{sub 2} level at which the maximum in SCC susceptibility is likely to be observed at temperatures lower than 338 to 360 C, at which SCC tests are time-consuming to perform. Limited SCC data are presented which are consistent with the observation that SCC susceptibility is maximized near the Ni/NiO transition at 288 C.
• Physical Description: 1940 Kilobytes pages

Subject

• Keyword: Thermodynamics
• Keyword: Alloys
• Keyword: Testing
• STI Subject Categories: 08 Hydrogen
• Keyword: Phase Stability
• Keyword: Free Energy
• STI Subject Categories: 42 Engineering
• Keyword: Oxides
• Keyword: Water
• Keyword: Chemistry
• Keyword: Hydrogen
• Keyword: Stress Corrosion

Source

• Other Information: PBD: 8 May 2001

Collection

• Name: Office of Scientific & Technical Information Technical Reports
  Code: OSTI

Institution

• Name: UNT Libraries Government Documents Department
  Code: UNTGD

Resource Type

• Report

Format

• Text

Identifier

• Report No.: LM-01K035
• Grant Number: AC12-00SN39357
• DOI: 10.2172/821680
• Office of Scientific & Technical Information Report Number: 821680
• Archival Resource Key: ark:/67531/metadc786426

Note

• Display Note: OSTI as DE00821680