Passivity of Metals

Frankenthal, R. P.; Krüger, J.; Vijh, Ashok K.

doi:10.1149/1.2129644

Cited by 161 publications

(145 citation statements)

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“…A considerable increase in Fe 2+ species is evident, as is a slight increase in OH, compared to the other entries in this table. This would be expected if there were less of the FeOOH species traditionally associated with the passive film and more of the precursor Fe(OH) 2 . ,, Wieckowski has reported that cyclic voltammograms obtained for polycrystalline iron and Fe (100) show differences in the baseline current in the anodic part of the cyclic voltammogram . It is possible that corrosion and pitting in sulfate leads to the exposure of different faces on the polycrystalline iron, thereby leading to shift in features and increased anodic current.…”

Section: Resultsmentioning

confidence: 99%

“…Corrosion and passivation of iron and its alloys have been studied extensively. − However, in spite of the numerous studies published, a great deal remains to be understood about these processes. There is no clear consensus on the nature of the passive film formed on iron in borate media, especially regarding the hydroxylation or lack thereof of these films. ,− The effect of surface morphology of iron on the electrochemical behavior has been to the best of our knowledge largely unexplored after some early reports by Wieckowski …”

Section: Introductionmentioning

confidence: 99%

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Combined UHV-Electrochemical Study of Polycrystalline Iron Electrodes in Borate and Sulfate Media

et al. 1997

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The passivation and corrosion of polycrystalline iron have been investigated using combined ultrahigh vacuum/electrochemical methods (UHV-EC) in borate electrolytes with and without sulfate contamination under a variety of experimental conditions. The presence of sulfate ions leads to enhanced anodic dissolution of iron under all circumstances, along with an increased hydroxylation of the surface film. Pitting of the iron surface is also observed. We report an unexpected effect: exposure of the electrode surface to sulfate solution significantly retards subsequent passivation in borate solution. This inhibition is observed even if the sulfate exposed sample is cleaned to the atomic level in UHV, prior to immersion in borate. This retardation manifests itself by way of a systematic trend toward higher potentials for the active−passive transition and the observation of increased anodic currents in the passive region. We attribute this effect to changes in surface morphology brought about by pitting of iron in sulfate solutions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combined UHV-Electrochemical Study of Polycrystalline Iron Electrodes in Borate and Sulfate Media

et al. 1997

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“…Ccr and CFe were calculated from equation 5 for each layer in the oxide and alloy phases until the bulk alloy composition was reached. The relevant value of A ' was used for each layer, depending on whether it was in the oxide or alloy phase.…”

Section: Resultsmentioning

confidence: 99%

“…Knowing IN, the intensity from each element can now be obtained for each layer, n, from (4). The molar concentration, C,,i, for element i in layer n is obtained from (5) In,iCP…”

Section: Methodsmentioning

confidence: 99%

Quantitative composition‐depth profiles of thin films

Frankenthal

Siconolfi

1985

Surface & Interface Analysis

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A technique utilizing a layer by layer analysis has been developed for obtaining the composition-depth profiles of thin films from Auger electron spectroscopy (AES) combined with ion sputtering. The technique, which has monolayer resolution and gives significantly more accurate results than prior methods, has been used for analyzing the composition of the native oxide on a series of iron-chromium alloys. The new results differ significantly from those that do not consider layer by layer variations in composition, and they are in good agreement with those obtained some years ago by ion-scattering spectrometry (ISS). In addition, it was confirmed that no preferential sputtering of Fe or Cr occuni during argon ion sputtering of the alloys.

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“…Despite this importance, there is a surprisingly large number of open questions concerning these films, most of them dealing with structural properties [1]. Two impediments to progress in understanding these films are particularly acute.…”

Section: Introductionmentioning

confidence: 99%

Growth and Dissolution of Protective Oxide Films on Titanium: an in-Situ Neutron Reflectivity Study

Wlesler

Majkrzak

1994

MRS Proc.

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The structure and morphology of titanium thin film electrodes have been investigated by neutron reflectometry. This technique yields a detailed depth profile of the scattering density, which is used to determine hydrogen and oxygen concentration profiles within the electrode. By depositing the electrode on a thick silicon crystal window, we are able to monitor the growth and dissolution of the protective oxide film covering the titanium as a function of time, electrode potential, and electrolyte composition. We find that, in 0.1 N sulfuric acid, the oxide dissolves at 0.7 A/h and is self-healing, meaning that as the oxide dissolves the metal underneath is oxidized to maintain a protective barrier. In contrast, when a -2 V cathodic bias is applied to a passive film, the oxide thins with no compensating oxide growth underneath, and the film undergoes electrochemical breakdown.

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Passivity of Metals

Abstract: not Available.

Cited by 161 publications

References 0 publications

Combined UHV-Electrochemical Study of Polycrystalline Iron Electrodes in Borate and Sulfate Media

Combined UHV-Electrochemical Study of Polycrystalline Iron Electrodes in Borate and Sulfate Media

Quantitative composition‐depth profiles of thin films

Growth and Dissolution of Protective Oxide Films on Titanium: an in-Situ Neutron Reflectivity Study

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