Hydrogen ingress into copper-nickel alloys
- SRI International, Menlo Park, CA (United States). Materials Research Center
Hydrogen (H) ingress into two copper (Cu)-nickel (Ni) alloys -- a commercial 77% Cu-15% Ni alloy (aged) and alloy K-500 (UNS N05500, aged and unaged) --- was studied using a technique referred to as hydrogen ingress analysis by potentiostatic pulsing (HIAPP). Anodic current transients obtained for these alloys in an acetate buffer (1 mol/L acetic acid + 1 mol/L sodium acetate [NaAc]) were analyzed using a diffusion-trapping model to determine trapping constants and H entry fluxes. A small increase was observed in the irreversible trapping constant for alloy K-500 with aging. Trapping constants of the aged alloys were similar within the limits of uncertainty, but H entry flux for the 77% Cu alloy was lower than that for aged or unaged alloy K-500. The lower flux may have accounted at least partly, for the Cu alloy's higher resistance to H embrittlement. Trap densities were consistent qualitatively with levels of sulfur (S) and phosphorus (P) in the two alloys. This finding supported an assumption that S and P provided the primary irreversible traps.
- OSTI ID:
- 7289337
- Journal Information:
- Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 50:4; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evaluation of a diffusion/trapping model for hydrogen ingress in high-strength alloys. Annual report, 15 September 1993-14 September 1994
Characterization of hydrogen ingress in high-strength alloys. Final report, 15 September 1993-14 September 1995
Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
ELEMENTS
EMBRITTLEMENT
HYDROGEN EMBRITTLEMENT
MEASURING METHODS
METALLURGICAL EFFECTS
MONEL
NICKEL ALLOYS
NICKEL BASE ALLOYS
NONMETALS
PHOSPHORUS
SULFUR