Catalytic Response and Electrode Kinetics on Noble Metal-Treated Type 304 Stainless Steel in 288°C Water

ABSTRACTThe coolant in boiling water reactor (BWR) recirculation lines is high-purity, neutral pH water containing radiolytically generated O2, hydrogen peroxide (H2O2), and H2.1-2 The level of oxidants is sufficient enough to promote intergranular stress corrosion cracking (IGSCC) of sensitized sta...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2000-12, Vol.56 (12), p.1242-1249
Main Authors: Kim, Y.-J., Andresen, P.L.
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steels
Chemical reactions
Copper
Corrosion
Corrosion potential
Corrosion tests
Electrochemical corrosion
Electrochemistry
Electrode polarization
Electrodes
Exact sciences and technology
Ferric oxide
Haematite
Heat resistant steels
Heavy metals
Hematite
High temperature
Hydrogen
Iron oxides
Kinetics
Magnetite
Metals
Metals. Metallurgy
Noble metals
Reaction kinetics
Recombination
Stainless steel
Water
Water chemistry
Zinc
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Summary:ABSTRACTThe coolant in boiling water reactor (BWR) recirculation lines is high-purity, neutral pH water containing radiolytically generated O2, hydrogen peroxide (H2O2), and H2.1-2 The level of oxidants is sufficient enough to promote intergranular stress corrosion cracking (IGSCC) of sensitized stainless steel (SS). In the BWR primary coolant, the radiolytic products, O2, H2, and H2O2, are the most stable species, and their concentrations can be calculated by radiolysis models. The electrochemical corrosion potential (ECP) is a primary controlling factor in IGSCC susceptibility of structural materials in high-temperature water, under unirradiated and irradiated conditions. The ECP is known to be controlled by the effective dissolved O2, H2O2, and H2 concentrations, and the increase in the mass transport rate and associated electrochemical interactions of reactants caused by hydrodynamic water flow is expected to alter the ECP behavior of structural materials under various water chemistry conditions. IGSCC is markedly decreased if the ECP is decreased below ~ ­230 mV vs the saturated hydrogen electrode (SHE).3-6 Also, low ECP provide an increased tolerance to aqueous impurities. One approach to controlling IGSCC in BWR is to decrease the dissolved oxidant levels by adding H2 in the feed water, known as hydrogen water chemistry (HWC), which consequently decreases the ECP of SS components. Under HWC, the H2 levels in almost all areas of BWR are in stoichiometric excess amounts for the
ISSN:0010-9312
1938-159X
DOI:10.5006/1.3280512