Influence of light ion irradiation of the oxide layer on the oxidation rate of Zircaloy-4

Influence of light ion irradiation of the oxide layer on the oxidation rate of zircaloy-4: Irradiation of the post-transition oxide layer

“…It describes quite well the evolution of the oxidation kinetics after irradiation. The accelerating factor (~2-3) found with ions in this study is quite close to that measured between cladding corroded in autoclave and in PWR at low burnup [17,3] but the oxide layers formed in reactor are significantly thicker than those studied previously in the references [18,19,20,21,22] which were obtained during the pre-transition kinetics stage (<2µm).…”

“…They showed a significant increase of the corrosion rate and these results were interpreted either by the effect of metal irradiation [18] or in terms of electric field effect or oxygen diffusion paths through the dislocations induced by irradiation [19]. Progress was recently made on the influence of irradiation defects produced in the pre-transition oxide on the oxidation rate of zirconium alloys [20][21][22]. It was indeed proved that ion irradiation defects and especially oxygen vacancies generated in thin oxide layers formed on Zy4 result in a significant increase of its oxidation rate.…”

“…It was indeed proved that ion irradiation defects and especially oxygen vacancies generated in thin oxide layers formed on Zy4 result in a significant increase of its oxidation rate. A model taking into account the vacancy concentration produced by ion irradiation and their thermal stability in the primary water was proposed in reference [20]. It describes quite well the evolution of the oxidation kinetics after irradiation.…”

Linear response calculation of first‐order Raman spectra of point defects in silicon carbide

“…In the latter class of materials probes, Raman spectroscopy has recently gained more and more momentum thanks to the availability of compact, easy to use, and even portable, devices, to the improved spatial resolution allowing to scan over regions with varying degree of damage, and to the nondestructive character of this optical investigation. Raman spectroscopy has been employed to investigate irradiation effects in various oxides and carbides , occasionally also in situ . Among carbides, various SiC polytypes and composites have been characterized with Raman spectroscopy after irradiation.…”

A mechanistic study on sulfur-induced passivity degradation on Alloy 800 in simulated alkaline crevice chemistries at temperatures ranging from 21 °C to 300 °C

“…Because passivation degradation of Alloy 800 is an electrochemical process in essence, electrochemical methods such as polarization curve, electrochemical impedance spectroscopy (EIS) [8,19], electrochemical noise [38][39][40] et al are often used to investigate the corrosion degradation mechanism. In addition, analysis methods, such as Time-of-flight secondary ion mass spectrometry (ToF SIMS) [41][42][43], X-ray photoelectron spectroscopy [44][45][46], current sensing atomic force microscopy [47][48][49], Auger electron spectroscopy [50,51], are available to study the composition and structure of the passive layer. This paper presents our insight into the temperature and sulfurinduced passivity degradation on Alloy 800 in simulated alkaline crevice chemistries.…”