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Title: Localized Corrosion: Passive Film Breakdown vs. Pit Growth Stability: Part III. A Unifying Set of Principal Parameters and Criteria for Pit Stabilization and Salt Film Formation

Abstract

The framework for pit stability established in Part II of this series is elaborated upon and expanded. The maximum pit dissolution current density, i diff,max, which depends on temperature and maximum potential at the pit surface in a given pit environment, is proposed and compared with the diffusion current density to determine the conditions for pit stability and salt film formation. For an open pit, the criterion for pit stability is that i diss,max must be greater than or equal to the critical diffusion current density required for maintaining a critical local environment for active dissolution, i diff,crit. The critical condition of i diss,max = i diff,crit is associated with three parameters that must be exceeded for stabilization of an open pit: critical temperature T crit, critical potential E crit and critical pit depth r crit. Analogously, the criterion for salt film formation is i diss,max must further exceed the diffusion-limited current density i lim, and three parameters associated with salt film formation are: saturation temperature T sat, saturation potential E sat and saturation pit depth r sat. Unifying criteria for control of pit growth by charge transfer or diffusion are proposed, which provide interrelationships for all principle parameters. Themore » pit stability criteria for covered pits, such as metastable pits, are also described.« less

Authors:
ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD); The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1464853
Alternate Identifier(s):
OSTI ID: 1509858
Grant/Contract Number:  
[SC0016584]
Resource Type:
Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
[Journal Name: Journal of the Electrochemical Society Journal Volume: 165 Journal Issue: 11]; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; pit stability; pitting corrosion; salt film

Citation Formats

Li, Tianshu, Scully, J. R., and Frankel, G. S. Localized Corrosion: Passive Film Breakdown vs. Pit Growth Stability: Part III. A Unifying Set of Principal Parameters and Criteria for Pit Stabilization and Salt Film Formation. United States: N. p., 2018. Web. doi:10.1149/2.0251811jes.
Li, Tianshu, Scully, J. R., & Frankel, G. S. Localized Corrosion: Passive Film Breakdown vs. Pit Growth Stability: Part III. A Unifying Set of Principal Parameters and Criteria for Pit Stabilization and Salt Film Formation. United States. doi:10.1149/2.0251811jes.
Li, Tianshu, Scully, J. R., and Frankel, G. S. Sat . "Localized Corrosion: Passive Film Breakdown vs. Pit Growth Stability: Part III. A Unifying Set of Principal Parameters and Criteria for Pit Stabilization and Salt Film Formation". United States. doi:10.1149/2.0251811jes.
@article{osti_1464853,
title = {Localized Corrosion: Passive Film Breakdown vs. Pit Growth Stability: Part III. A Unifying Set of Principal Parameters and Criteria for Pit Stabilization and Salt Film Formation},
author = {Li, Tianshu and Scully, J. R. and Frankel, G. S.},
abstractNote = {The framework for pit stability established in Part II of this series is elaborated upon and expanded. The maximum pit dissolution current density, idiff,max, which depends on temperature and maximum potential at the pit surface in a given pit environment, is proposed and compared with the diffusion current density to determine the conditions for pit stability and salt film formation. For an open pit, the criterion for pit stability is that idiss,max must be greater than or equal to the critical diffusion current density required for maintaining a critical local environment for active dissolution, idiff,crit. The critical condition of idiss,max = idiff,crit is associated with three parameters that must be exceeded for stabilization of an open pit: critical temperature Tcrit, critical potential Ecrit and critical pit depth rcrit. Analogously, the criterion for salt film formation is idiss,max must further exceed the diffusion-limited current density ilim, and three parameters associated with salt film formation are: saturation temperature Tsat, saturation potential Esat and saturation pit depth rsat. Unifying criteria for control of pit growth by charge transfer or diffusion are proposed, which provide interrelationships for all principle parameters. The pit stability criteria for covered pits, such as metastable pits, are also described.},
doi = {10.1149/2.0251811jes},
journal = {Journal of the Electrochemical Society},
number = [11],
volume = [165],
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1149/2.0251811jes

Citation Metrics:
Cited by: 10 works
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