Photoelectrochemical analysis of the effects of pH and sulfate ions on the structure and the composition of the passive film formed on Fe-20Cr-15Ni alloy

Jang, HeeJin; Park, Chan‐Jin; Kwon, Hyuk‐Sang

doi:10.1007/s12540-009-0057-0

Cited by 4 publications

(2 citation statements)

References 28 publications

(50 reference statements)

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“…These diagrams are established for the type of barrier layer that forms, not for specific metals or alloys, although specific alloy effects are likely to become important as, presumably, the kinetic param eters depend upon the substrate. Thus, a defective chromia barrier layer with the general formula, Cr 2 + x O 3 -y , forms on many chromium containing alloys (stainless steels [64,65], Ni-Cr [66], Fe-Cr [66], etc.) and on pure chromium.…”

Section: The Kinetic Properties Of the Passive Statementioning

confidence: 99%

Some personal adventures in passivity—A review of the point defect model for film growth

Macdonald

2012

Russ J Electrochem

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A review is presented of the history of the development of the Point Defect Model (PDM) for the growth and breakdown of passive films that form on the surfaces of reactive metals in contact with corrosive, condensed phase environments. The PDM has passed through three generations, with each successive gen eration addressing issues that have arisen from experiment. Thus, the first Generation model (PDM I), which was developed in the late 1970s/early 1980s, assumed that the passive film was a single defective oxide layer that contained cation vacancies and oxygen vacancies that were generated and annihilated at the metal/film and film/solution interfaces. This model was inspired by the work by Wagner on high temperature oxidation. As with gas phase systems, the film was assumed not to dissolve. However, it soon became evident that this model could not account for the properties of the passive state on metals in contact with aqueous environments and, accordingly a Generation II model (PDM II) was developed to address these issues. PDM II incorporated the bi layer structure of the film comprising a defective oxide (or hydride) barrier layer that grows into the metal and an outer layer that forms by precipitation of material from the reaction of cations transmitted through the barrier layer with species in the environment (including water, HS -, etc.), introduced metal interstitials to the suite of defects, recognized barrier layer dissolution, and recognized the need to classify reactions as to whether they are lattice conservative or non conservative. PDM II has enjoyed considerable success and the author knows of no instance where it has been demonstrated to be at odds with experiment when confluence between experiment and theory has been demonstrated. A Generation III model (PDM III) has been recently developed to extend the theory to those cases (e.g., the valve metals) where the outer layer is so resistive that it controls the impedance of the interface and hence the corrosion rate. A fourth generation model that will describe passivity on alloys is now under development. The experi mental evidence upon which each generation is based is reviewed.

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Section: The Kinetic Properties Of the Passive Statementioning

confidence: 99%

Some personal adventures in passivity—A review of the point defect model for film growth

Macdonald

2012

Russ J Electrochem

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“…Therefore, the Pd-based alloys studied in this work are regarded to have ntype semiconductivity predominated by Fe oxide, from the conducting type and the flat band potential. The donor density, which means the density of oxygen vacancy practically, for the passive films was determined from the Mott-Schottky plots, assuming the dielectric constant as 15.6 [25]. The dielectric constants of the passive film of Pdbased alloys are not known, actually.…”

Section: Resultsmentioning

confidence: 99%

Effects of Crystallization on the Corrosion and Passivity of Amorphous Pd-Fe-Co-Si-B Alloys

Jang

Lee

Kim

2017

Journal of Nanomaterials

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Corrosion behavior of Pd48.2Fe17Co16.7Si13.4B4.7 and Pd51.4Fe18Co18Si11.1B1.5 alloys was examined by potentiodynamic polarization tests in pH 8.5 buffer solution. The amorphous alloy ribbons showed passivity with the passive current densities of 2 × 10−6 A/cm2~4 × 10−6 A/cm2. The crystalline alloys showed a higher corrosion rate in pH 8.5 buffer solution with the degree of variation depending on the alloy composition. It is suggested from the Mott-Schottky analysis that the donor density was lower for the amorphous alloy than the crystalline alloy.

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Photoelectrochemical analysis of passive films formed on Ni and its alloys and its application to their corrosion behaviors

Jang

Kwon

2015

J Solid State Electrochem

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Photoelectrochemical analysis of the effects of pH and sulfate ions on the structure and the composition of the passive film formed on Fe-20Cr-15Ni alloy

Cited by 4 publications

References 28 publications

Some personal adventures in passivity—A review of the point defect model for film growth

Some personal adventures in passivity—A review of the point defect model for film growth

Effects of Crystallization on the Corrosion and Passivity of Amorphous Pd-Fe-Co-Si-B Alloys

Photoelectrochemical analysis of passive films formed on Ni and its alloys and its application to their corrosion behaviors

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