A mixed-conduction model for oxide films on Fe, Cr and Fe–Cr alloys in high-temperature aqueous electrolytes––I. Comparison of the electrochemical behaviour at room temperature and at 200 °C

Beverskog, B.; Bojinov, Martin; Englund, Anders; Kinnunen, Petri; Laitinen, Timo; Mäkelä, Kari; Saario, Timo; Sirkiä, Pekka

doi:10.1016/s0010-938x(02)00008-2

Cited by 76 publications

(20 citation statements)

References 22 publications

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“…the Point Defect Model [1][2][3][4][5][6][7][8][9][10][11] and the Mixed Conduction Model [12][13][14][15][16]. Both models assume that the metal is covered by a dense oxide layer.…”

Section: Introductionmentioning

confidence: 99%

Corrosion modelling of iron based alloy in nuclear waste repository

Bataillon

Bouchon

Chainais-Hillairet

et al. 2010

Electrochimica Acta

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“…the Point Defect Model [1][2][3][4][5][6][7][8][9][10][11] and the Mixed Conduction Model [12][13][14][15][16]. Both models assume that the metal is covered by a dense oxide layer.…”

Section: Introductionmentioning

confidence: 99%

Corrosion modelling of iron based alloy in nuclear waste repository

Bataillon

Bouchon

Chainais-Hillairet

et al. 2010

Electrochimica Acta

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“…In this model, R s corresponds to the resistance of the solution. relaxation process (time constant) appearing in the electrochemical system of EIS [24].Thus, the one time constant is well defined for three samples through the Bode diagram at medium frequency. It is clearly presented that the augmentation of the phase angle with an increase in the immersion time, as shown in Figures 5-7.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 98%

“…Electrochemical impedance spectroscopy (EIS) measurements were carried out at the OCP after the specimens had been immersed for 1,6,12,24,48, and 72 h, respectively. The testing frequency ranges from 100 kHz to 10 mHz with an applied AC disturbance signal of 10 mV rms (root mean square).…”

Section: Electrochemical Testingmentioning

confidence: 99%

“…The Bode phase angle plots (Figures 5b, 6b and 7b) exhibit an inflection in the medium frequency range of 1 kHz-0.1 Hz, attributed to the response of double layer capacitance. The number of distinguishable peaks or hollows is a representation of the relaxation process (time constant) appearing in the electrochemical system of EIS [24].Thus, the one time constant is well defined for three samples through the Bode diagram at medium frequency. It is clearly presented that the augmentation of the phase angle with an increase in the immersion time, as shown in Figures 5-7.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

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Effect of Different Welding Processes on Electrochemical and Corrosion Behavior of Pure Nickel in 1 M NaCl Solution

Wang

Zhang

et al. 2017

Metals

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Abstract:A plasma arc welding (PAW)-tungsten inert gas (TIG) hybrid welding process is proposed to weld pure nickel. In PAW-TIG welding, the arc of the PAW was first to be ignited, then TIG was ignited, while in PAW welding, only the PAW arc was launched. This paper investigated the effect of different welding processes on electrochemical and corrosion performance of between a pure nickel joint and a base metal in an aerated 1 M NaCl solution, respectively. The average grain size of the joint fabricated by PAW welding (denoted as J P joint) is 463.57 µm, the joint fabricated by PAW-TIG welding(denoted as J P-T joint) is 547.32 µm, and the base metal (BM) is 47.32 µm. In this work, the passivity behaviors of samples were characterized for two welding processes by electrochemical impedance spectroscopy (EIS), open circuit potential versus immersion time (OCP-t), and the potentiodynamic polarization plots. EIS spectra, attained with different immersion times, were analyzed and fitted by an equivalent electrical circuit. Photomicrographs of BM, J P , and J P-T were also taken with a scanning electron microscope (SEM) to reveal the morphological structure of the pit surfaces. Electrochemical tests show that the sequence of the corrosion resistance is BM > J P > J P-T . The size and quantity of the hemispherical corrosion pits of all samples are different. The corrosion morphology observations found a consistency with the consequence of the electrochemical measurements. The results show that an increase of the grain dimensions due to different heat treatments decreased the pure nickel stability to pitting corrosion.

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“…Warburg-type transport impedance [40]. By deconvolution of the spectra, it has been found that the high-frequency time constant is best described with Young-type impedance [35] Young impedance describes an insulating or semiconducting layer in which a steadystate profile of defects stretches from an interface to the bulk and gives rise to an exponential conductivity profile [41] Young impedance can be approximated by a constant phase element (CPE) in a frequency range [42] where…”

Section: Thin Layer Electrochemistrymentioning

confidence: 99%

Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors

Balachov¹,

Kobayashi²,

Tanzella³

et al. 2004

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REPORT DOCUMENTATION PAGEForm Approved OMB NO. Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and This work contributes to the design of safe and economical Generation-IV Super-Critical Water Reactors (SCWRs) by providing a basis for selecting structural materials to ensure the functionality of in-vessel components during the entire service life. During the second year of the project, we completed electrochemical characterization of the oxide film properties and investigation of crack initiation and propagation for candidate structural materials steels under supercritical conditions. We ranked candidate alloys against their susceptibility to environmentally assisted degradation based on the in situ data measured with an SRI-designed controlled distance electrochemistry (CDE) arrangement. A correlation between measurable oxide film properties and susceptibility of austenitic steels to environmentally assisted degradation was observed experimentally. One of the major practical results of the present work is the experimentally proven ability of the economical CDE technique to supply in situ data for ranking candidate structural materials for Generation-IV SCWRs. A potential use of the CDE arrangement developed at SRI for building in situ sensors for monitoring water chemistry in the heat transport circuit of Generation-IV SCWRs was evaluated and proved to be feasible. Understanding basic phenomena. Kinetic parameters of the charge and mass transport processes in the metal/oxide film/supercritical water system are derived from in situ oxide film studies to understand and quantify the rate-controlling processes and, eventually, the fundamentals of the metal oxidation phenomenon at supercritical temperatures. Providing a basis for the development of new alloys. Integration of the in situexperimental information on oxide film resistance to charge and mass transport for alloys of various compositions, along with fracture surface analysis and current theoretical understanding of the relationship between properties of the oxide films and stability of materials, is expected to aid in material selection and the development process. It will do so by providing recommendations for chemical compositions of the alloys in regard to their expected locations in the reactor (or more specifically, in regard to local temperature and oxidizing conditions). 1 WORK PERFORMED AND PRELIMINARY RESULTSDuring this project, SRI completed the electrochemical characterization of the oxide film prop...

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A mixed-conduction model for oxide films on Fe, Cr and Fe–Cr alloys in high-temperature aqueous electrolytes––I. Comparison of the electrochemical behaviour at room temperature and at 200 °C

Cited by 76 publications

References 22 publications

Corrosion modelling of iron based alloy in nuclear waste repository

Corrosion modelling of iron based alloy in nuclear waste repository

Effect of Different Welding Processes on Electrochemical and Corrosion Behavior of Pure Nickel in 1 M NaCl Solution

Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors

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