Primary Water SCC Understanding and Characterization Through Fundamental Testing in the Vicinity of the Nickel/Nickel Oxide Phase Transition

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

Lockheed Martin

关键词: Corrosion;    Crack Propagation;    Testing;    08 Hydrogen;    36 Materials Science;   

DOI  :  10.2172/821310
RP-ID  :  LM-01K038
RP-ID  :  AC12-00SN39357
RP-ID  :  821310

美国|英语

来源: UNT Digital Library

【 摘 要 】

This paper quantifies the nickel alloy stress corrosion crack growth rate (SCCGR) dissolved hydrogen level functionality. SCCGR has been observed to exhibit a maximum in proximity to the nickel/nickel oxide phase transition. The dissolved hydrogen level SCCGR dependency has been quantified in a phenomenological model in terms of the stability of nickel oxide not the dissolved hydrogen level. The observed SCCGR dependency has been extended to lower temperatures through the developed model and Contact Electrical Resistance (CER) measurements of the nickel/nickel oxide phase transition. Understanding obtained from this hydrogen level SCC functionality and complementary SCC subprocesses test results is discussed. Specifically, the possible SCC fundamental subprocesses of corrosion kinetics, hydrogen permeation and pickup have also been measured for nickel alloys. Secondary Ion Mass Spectroscopy (SIMS) analysis has been performed on SCCGR specimens tested in heavy water (D{sub 2}O).