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H 2 O 2 and γ-radiation induced corrosion of 304L stainless steel in aqueous systems
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0003-0663-0751
2019 (English)In: Radiation Physics and Chemistry, ISSN 0969-806X, E-ISSN 1879-0895, Vol. 159, p. 159-165Article in journal (Refereed) Published
Abstract [en]

In light-water reactors the water used as neutron moderator and coolant is subjected to a constant radiation field which leads to the formation of a number of oxidizing and reducing species. In this work, the reactivity of the radiolysis product H 2 O 2 towards the 304L alloy, commonly used for structural materials in nuclear power plants, was investigated as well as oxidative dissolution of steel components as a consequence of γ-radiation and chemically added H 2 O 2 . The concentration of hydrogen peroxide as a function of time was monitored in the presence of different amounts of steel powder, and the second order reaction rate constant was determined to k 2 = (1.8 ± 0.2) × 10 −10 m s −1 . In the case of catalytic decomposition of hydrogen peroxide, hydroxyl radicals are formed which can be scavenged by methanol. In this reaction formaldehyde is formed, which can be detected spectroscopically. A high yield of formaldehyde was observed, indicating that catalytic decomposition is the main reaction path of H 2 O 2 in the current system. A significant contribution of the homogeneous Fenton reaction to both the reaction rate constant and the formaldehyde formation must however be considered, as Fe(II) will be released from the oxide layer in solution. In the case of γ-irradiation, an increased nickel content in solution compared to background experiments is seen. When the steel is subjected to chemically added hydrogen peroxide on the other hand, the chromium content in solution is increased. This indicates that the different types of exposure will impact different parts of the oxide layer characterized by different composition. © 2019

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 159, p. 159-165
Keywords [en]
Formaldehyde, Gamma rays, Hydrogen peroxide, Iron compounds, Light water reactors, Neutron irradiation, Nuclear fuels, Nuclear power plants, Oxidation, Peroxides, Radiation chemistry, Rate constants, Steel corrosion, 304L stainless steel, Catalytic decomposition, Gamma irradiation, Neutron moderators, Oxidative dissolution, Radiation-induced, Radiolysis products, Second-order reaction, Austenitic stainless steel, chromium, hydroxyl radical, methanol, nickel, stainless steel, Article, corrosion, decomposition, dissolution, Fenton reaction, radiolysis, surface area
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-252508DOI: 10.1016/j.radphyschem.2019.02.047ISI: 000472690000022Scopus ID: 2-s2.0-85062715868OAI: oai:DiVA.org:kth-252508DiVA, id: diva2:1336950
Note

QC 20190711

Available from: 2019-07-11 Created: 2019-07-11 Last updated: 2019-07-11Bibliographically approved

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Toijer, ElinJonsson, Mats

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