Electrochemical behaviour of gold and stainless steel under proton irradiation and active RedOx couples

Leoni, E.; Corbel, C.; Cobut, V.; Simon, D.; Féron, Damien; Roy, M.; Raquet, O.

doi:10.1016/j.electacta.2007.07.029

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…As for the in-beam tests, it is plausible that radiolysis products such as hydroperoxy and other radical species formed during proton irradiation would modify the behavior of SCC. Some researchers 11,12) have examined the electrochemical behavior of stainless steels during proton irradiation, and demonstrated the promotion of electrochemical reactions induced by radiolysis products at the interface of the steels. A decrease of electrochemical potential followed by slow recovery in a transient period during proton irradiation has been correlated with the enhanced reaction followed by growth of passive film at the interface.…”

Section: Resultsmentioning

confidence: 99%

In-Beam Stress Corrosion Tests for Welded 308 Stainless Steel in Pure Water at 473 K

et al. 2014

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Stress corrosion tests were performed for welded 308 stainless steel under proton irradiation at 473 K. The concentration of oxygen and hydrogen in the feed water was controlled to be below 5 and 10 ppb, respectively. The in-beam loading condition was 0 and 300 MPa in tension under an irradiation dose rate of 1.3 © 10 ¹7 dpa/s. The electrochemical corrosion potential (ECP) was also measured during the tests. After the corrosion tests, the specimen surface at the fusion zone was examined by SEM for all specimens. Extensive electrochemical reactions on the specimen surface were implied by ECP measurement under the in-beam loading condition. The initiation of surface cracking followed by coalescence of numerous larger corrosion pits at the boundaries of ferrite phases in the austenitic matrix was detected for the in-beam specimens at 300 MPa. Thus, the initial process of stress corrosion cracking at weld metal would be accelerated under irradiation.

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Section: Resultsmentioning

confidence: 99%

In-Beam Stress Corrosion Tests for Welded 308 Stainless Steel in Pure Water at 473 K

et al. 2014

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“…1114) Since some radiolysis products such as oxygen, hydrogen peroxide and other radicals can act as strong oxidants in a water solution, the reduction reactions of oxidant species, namely cathodic reactions, are mainly enhanced by water radiolysis. 9,11) The addition of hydrogen to the water environment is well recognized as an effective countermeasure to suppress water radiolysis. 6) A drastic decrease in the production density of radiolysis oxidant species as a function of DH concentration has been reported in an in-pile reactor environment.…”

Section: Discussionmentioning

confidence: 99%

In-Beam Stress Corrosion Behavior of Welded 308 Stainless Steel at 473 K in Aerated and Hydrogenated Water Conditions

Murase¹,

Yamamoto²,

Shinohara³

et al. 2015

Mater. Trans.

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Stress corrosion tests were performed for welded 308 stainless steel under proton irradiation at 473 K in aerated water (DO: 0.150.22 ppm, DH: <10 ppb) and hydrogenated water (DH: 1.01.4 ppm, DO: <5 ppb) conditions. The in-beam loading condition was 0 and 300 MPa in tension under an irradiation dose rate of 1.3 © 10 ¹7 dpa/s. In situ measurement of electrochemical corrosion potential (ECP) and subsequent SEM analysis were also conducted for all the specimens. In the aerated water condition, the process of stress corrosion cracking (SCC) was significantly accelerated under irradiation, while the in-beam effect on SCC was suppressed in the hydrogenated water condition. The in-beam stress corrosion behavior is discussed in terms of both water radiolysis and radiation-induced microstructures.

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“…Besides these metallurgical factors, it is well accepted that neutron irradiation can signi cantly modify SCC behavior through radiolysis of the coolant water and microstructural/microchemical changes in the materials produced by displacement damage. Some radiolytic products such as hydrogen peroxide and other radicals can act as strong oxidants in a water solution, leading to enhanced cathodic reactions in the electrochemical reaction 9,10) . On the other hand, the development of dislocation structures under irradiation could provide additional internal areas to be oxidized through a higher oxygen diffusion rate along dislocations 11) , and thereby contribute to the increase in anodic reactions.…”

Section: Introductionmentioning

confidence: 99%

Selective Dissolution of Delta Ferrite Phase in Welded 308 Stainless Steel under Proton Irradiation

2017

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Electron backscatter diffraction (EBSD) measurements were performed for welded 308 stainless steel corroded under proton irradiation at 473 K. After chemical cleansing and subsequent mechanical polishing to remove oxide layers on the specimen surface for EBSD measurements, selective dissolution of delta ferrite (δ) phase in the dendritic microstructure was detected only for the in-beam corroded specimen. The susceptibility to δ phase dissolution is dependent on the deviation angle of its orientation from the (101) plane on the specimen surface when δ phases are in a grain of austenitic gamma (γ) phase as well as on the γ-γ phase grain boundaries except for the coincidence grain boundaries. Selective dissolution of δ phase would be explained by not only radiolytic products such as radical oxygen acting as electric charge carriers but also the radiation-induced point defects and dislocation structures playing an important role in sustaining anodic reactions at δ phases.

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Electrochemical behaviour of gold and stainless steel under proton irradiation and active RedOx couples

Cited by 9 publications

References 17 publications

In-Beam Stress Corrosion Tests for Welded 308 Stainless Steel in Pure Water at 473 K

In-Beam Stress Corrosion Tests for Welded 308 Stainless Steel in Pure Water at 473 K

In-Beam Stress Corrosion Behavior of Welded 308 Stainless Steel at 473 K in Aerated and Hydrogenated Water Conditions

Selective Dissolution of Delta Ferrite Phase in Welded 308 Stainless Steel under Proton Irradiation

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