Replicating PWR Primary Water Conditions in Low Pressure H2-Steam Environment to Study Alloy 600 Oxidation Processes. Issue 2 (1st January 2019)

• Record Type: Journal Article
• Authors: Volpe, L.; Bertali, G.; Curioni, M.; Burke, M. G.; Scenini, F.
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 2(2019)
• Page Start: C1
• Page End: C8
• Publication Date: 2019-01-01
• Subjects: Corrosion -- High Temperature Corrosion -- Ni/NiO transition -- Redox Potential -- Solid State Reference Electrode; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0081902jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The effects of thermodynamic parameters associated with low pressure H2 -steam on the oxidation behavior of Nickel have been investigated to simulate PWR primary water conditions. An Y2 O3 -ZrO2 solid state reference electrode operated between 372 and 480°C, and exposed to variable hydrogen partial pressures, was used to obtain in-situ potential measurements to identify the Ni/NiO transition. Microstructural analyses on Alloy 600 coupons exposed to H2 -steam under different oxidizing conditions showed a marked dependence of the intergranular oxidation processes, as expected for a PWR environment. Overall, the H2 -steam simulated an environment that can be considered to be representative of PWR primary water.