Analysis of the impedance response of passive iron

Castro, E.B.

doi:10.1016/0013-4686(94)e0172-v

Cited by 43 publications

(30 citation statements)

References 16 publications

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“…12). A linear region is observed between [−0.05, 0.25] V versus SCE, in which a donor concentration of 8.1 × 10 21 cm −3 is obtained, slightly higher than the reported in literature [20].…”

Section: Physical Interpretation Of the Growth Under Potential Controsupporting

confidence: 48%

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Electrochemical impedance spectroscopy for studying passive layers on steel rebars immersed in alkaline solutions simulating concrete pores

Sánchez

Gregori

Alonso

et al. 2007

Electrochimica Acta

218

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Section: Physical Interpretation Of the Growth Under Potential Controsupporting

confidence: 48%

“…In fact, a diffusion tail appears in Nyquist plot, and thus the electric equivalent circuit including a Warburg component becomes necessary [16,17]. The presence of Warburg components has been related with the diffusion of oxygen vacancies in the frame of the Point Defect Model [17][18][19][20] for n-type semiconductors behaviour.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical impedance spectroscopy for studying passive layers on steel rebars immersed in alkaline solutions simulating concrete pores

Sánchez

Gregori

Alonso

et al. 2007

Electrochimica Acta

218

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“…In particular, electrochemical impedance spectroscopy has proved to be very useful to achieve this goal [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Chemical composition and electronic structure of anodic passive films on low-C 13CrNiMo stainless steel

Gervasi

Méndez

Bolzán

et al. 2015

J Solid State Electrochem

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Mott-Schottky analysis and electrochemical and X-ray photoelectron spectroscopy (XPS) measurements were performed on passive films formed on low-C 13CrNiMo stainless steel with different applied heat treatments. Heat treatments render particular microstructural features of the alloy with a significant impact on the ability of the passive films to afford adequate protection against localized corrosion. A lower level of retained austenite in the substrate renders thinner passive films. Phosphates coexist with oxidized Fe(III) compounds as the prevailing species in the anodic layers. Mo was only detected in the oxide film formed on the sample with a higher retained austenite content.Passive layers behave as n-type semiconductors with two types of donors, namely, shallow-level and deep-level states. The observed flat band potential V FB ≅ -0.425 ± 0.005 V vs. standard calomel electrode (SCE) is independent of the thermal treatment of the alloy but under potential bias conditions at the corrosion potential the occurrence of the cathodic reaction on the oxide surface is hindered on the sample with higher retained austenite in its microstructure as compared to the sample with lower retained austenite content.

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“…Information on the electrical properties of the film bulk and the interfacial regions can also be extracted [3,4,[11][12][13][14][15][16]. However, the relatively high number of adjustable parameters often precludes unambiguous interpretation of impedance spectra in terms of a unique kinetic model.…”

Section: Symmetrical and Asymmetrical Configurations For In Situ Studmentioning

confidence: 99%

“…Electrochemical impedance spectroscopy has been widely applied to the study of the kinetics of the growth and dissolution of oxide films for a range of technically important metals and alloys [11][12][13][14][15][16]. The first step in this approach is to correlate measurement data with electrochemical models.…”

Section: Symmetrical and Asymmetrical Configurations For In Situ Studmentioning

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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Analysis of the impedance response of passive iron

Cited by 43 publications

References 16 publications

Electrochemical impedance spectroscopy for studying passive layers on steel rebars immersed in alkaline solutions simulating concrete pores

Electrochemical impedance spectroscopy for studying passive layers on steel rebars immersed in alkaline solutions simulating concrete pores

Chemical composition and electronic structure of anodic passive films on low-C 13CrNiMo stainless steel

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

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