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  4. Modeling of electrochemical oxide film growth-a PDM refinement
 
Zitierlink DOI
10.26092/elib/2395
Verlagslink DOI
10.1016/j.electacta.2022.139847

Modeling of electrochemical oxide film growth-a PDM refinement

Veröffentlichungsdatum
2022-01-07
Autoren
Bösing, Ingmar  
La Mantia, Fabio  
Thöming, Jorg  
Zusammenfassung
The Point Defect Model (PDM) is known for over 40 years and has brought deeper insight to the understanding of passivity. During the last decades it has seen several changes and refinements, and it has been widely used to analyze growth kinetics of different alloys. Nevertheless, the model has been based on still unconfirmed assumptions, as constant and potential independent electric field strength. To overcome this limitation, we introduce a Refined PDM (R-PDM) in which we replace those assumptions by using additional equations for charge distribution including new physically valid boundary conditions based on considering finite dimensions for the defects by introduction of two defect layer at the film boundaries and by calculating the potential drop at the surface of the film towards the solution over the compact double layer. The calculations by the R-PDM show that the original PDM assumptions are only valid for very specific parameter combinations of oxide film growth and vacancies transport and cannot generally be taken for granted. We believe our findings of electric field and potential drop dependency on the external potential to pave the way for a more realistic description of passive layer formation.
Schlagwörter
Passivity

; 

metal oxides

; 

modeling

; 

oxide film growth

; 

PDM

; 

Point Defect Model
Verlag
Elsevier Science
Institution
Universität Bremen  
Fachbereich
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04)  
Institute
Fachgebiet 22: Chemische Verfahrenstechnik  
Fachgebiet 31: Energiespeicher- und Energiewandlersysteme  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Electrochimica Acta  
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

Bösing_Modeling of Electrochemical Oxide Film Growth-a PDM Refinement_2022.pdf

Size

1.71 MB

Format

Adobe PDF

Checksum

(MD5):3a309801748b94f17ca12937b04c7dc8

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