Measurement of the Nickel/Nickel Oxide Transition in Ni-Cr-Fe Alloys and Updated Data and Correlations to Quantify the Effect of Aqueous Hydrogen on Primary Water SCC.

Attanasio, S. A. ; Morton, D. S.

Technical Information Center Oak Ridge Tennessee

关键词: Nickel base alloys;    Hydrogen;    Stress corrosion;    Oxides;    Alloys;   

RP-ID  :  DE2004821507

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Alloys 600 and X-750 have been shown to exhibit a maximum in primary water stress corrosion cracking (PWSCC) susceptibility, when testing is conducted over a range of aqueous hydrogen (H(sub 2)) levels. Contact electric resistance (CER) and corrosion coupon testing using nickel specimens has shown that the maximum in SCC susceptibility occurs in proximity to the nickel-nickel oxide (Ni/NiO) phase transition. The measured location of the Ni/NiO transition has been shown to vary with temperature, from 25 scc/kg H(sub 2) at 360 C to 4 scc/kg H(sub 2) at 288 C. New CER measurements show that the Ni/NiO transition is located at 2 scc/kg H(sub 2) at 260 C. An updated correlation of the phase transition is provided.