Chemical composition and electronic structure of passive films formed on Alloy 600 in acidic solution

Ries, Lúcia Allebrandt da Silva; Belo, M. Da Cunha; Ferreira, M.G.S.; Müller, Ivan

doi:10.1016/j.corsci.2007.11.006

Cited by 69 publications

(15 citation statements)

References 27 publications

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“…The positive and negative slope in the Mott-Schottky analysis were reported for austenitic stainless steels and nickel-based alloys in simulated PWR environments [26,36,[38][39][40]. One possible explanation is related to the spinel structure of the oxides formed on these materials.…”

Section: Mott-schottky Analysismentioning

confidence: 73%

Electrochemical and spectroscopic characterization of oxide films formed on Alloy 182 in simulated boiling water reactor environment: Effect of dissolved hydrogen

et al. 2018

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In boiling water reactor (BWR) environments, the content of dissolved hydrogen (DH) in the high-temperature water has an influence on the stress corrosion cracking (SCC) susceptibility of Ni-based alloys. In order to understand the possible role of different types of surface oxide films in the SCC initiation process, oxide films formed on Alloy 182 weld metal under simulated BWR conditions at 274°C with varying contents of DH from 10 to 2200 ppb, were investigated by electrochemical and spectroscopic methods. The influence of the DH content on the nature of the oxide films is discussed in the context of SCC mechanisms.

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Section: Mott-schottky Analysismentioning

confidence: 73%

Electrochemical and spectroscopic characterization of oxide films formed on Alloy 182 in simulated boiling water reactor environment: Effect of dissolved hydrogen

et al. 2018

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“…A constant phase element (CPE) was introduced into each equivalent circuit in order to reproduce the EIS results. The CPE is used to account for the fact that deviations from the ideal circuit element may occur owing to the complex oxide film structure of the materials in high‐temperature water . The impedance of the CPE is typically expressed as

Z_{C P E} = \frac{1}{Q {true(j ω true)}^{n}}

where Q , n , j , and ω are the CPE coefficient, CPE exponent, imaginary unit, and angular frequency, respectively.…”

Section: Resultsmentioning

confidence: 99%

Corrosion behavior of different parts of the weld of 316L/52M/A508 dissimilar metal welded joint in simulated pressurized water reactor primary water

Ding

Zhang

Wang

et al. 2015

Materials & Corrosion

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The electrochemical behavior and oxide film structure of the weld of 316L/52M/A508 dissimilar metal welded joints were investigated via scanning electron microscopy (SEM), potentiodynamic polarization measurements, electrochemical impedance spectroscopy (EIS), and X‐ray photoelectron spectroscopy (XPS). The electrochemical measurements revealed that the weld materials could be arranged in descending order of protectiveness of the oxide film formed on their surface; that is, Alloy52Mw > Alloy52Mb > C52M > C308. The results of EIS and XPS analyses showed that the oxide films formed on these materials were duplex‐structured; this duplex structure consisted of a Cr‐rich (in 52M nickel‐based weld materials) or Cr/Fe‐rich (in C308 stainless steel weld materials) inner layer and a Ni/Fe‐rich (in 52M nickel‐based weld materials) or Fe‐rich (in 308 stainless steel weld materials) porous outer layer.

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“…1) as for nitinol because of the high content of Ni (50 at.%) in nitinol. The two anodic current peaks are related to the formation of α-Ni(OH) 2 and β-Ni(OH) 2 , and the abrupt increase in the current density at E>0.8 V Ag|AgCl is due to nickel dissolution [39]. The shape of the cyclic voltammograms at E≥0.9 V Ag|AgCl is typical for pitting corrosion.…”

Section: Electrochemical Behavior Of Nitinol In 1 M Acetic Acidmentioning

confidence: 97%

Kinetics of passivity of NiTi in an acidic solution and the spectroscopic characterization of passive films

Metikoš‐Huković

Katić

Milošev

2012

J Solid State Electrochem

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Anodic polarization of nitinol in acetic acid under galvanostatic conditions produces oxide films composed mainly of TiO 2 . An exponential current-field relation is valid during ionic conduction through the growing oxide, in which the field coefficient is related to the jump distance. Transport processes in anodic films have been discussed in terms of a cooperative mechanism developed for amorphous oxide films on valve metals, in which both metal and oxygen ions were involved in ionic conduction. For more crystalline oxide structure of passive films on nitinol, formed during a prolonged potentiostatic conditions, the charge transfer takes place only through the oxygen vacancies as mobile species via a high-field-assisted mechanism. Based on the results of the Mott-Schottky analysis, these films behave as n-type semiconductors indicating that oxygen vacancies formed during the film formation and growth act as electron donors. The barrier/protecting and electronic/ semiconducting properties of the passive films as well as their chemical composition were studied using electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy.

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Chemical composition and electronic structure of passive films formed on Alloy 600 in acidic solution

Cited by 69 publications

References 27 publications

Electrochemical and spectroscopic characterization of oxide films formed on Alloy 182 in simulated boiling water reactor environment: Effect of dissolved hydrogen

Electrochemical and spectroscopic characterization of oxide films formed on Alloy 182 in simulated boiling water reactor environment: Effect of dissolved hydrogen

Corrosion behavior of different parts of the weld of 316L/52M/A508 dissimilar metal welded joint in simulated pressurized water reactor primary water

Kinetics of passivity of NiTi in an acidic solution and the spectroscopic characterization of passive films

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