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Title: Localized Corrosion: Passive Film Breakdown vs Pit Growth Stability: Part II. A Model for Critical Pitting Temperature

Abstract

Potentiostatic temperature-scanned experiments were performed on 316L stainless steel and revealed that both the measured values of critical pitting temperature (CPT) and their distribution ranges increased with the decrease of the aggressiveness of exposure conditions. Previous models for CPT cannot explain these observations, so a model for CPT is proposed based on criteria for pit growth stability with added effects of the passive film breakdown. The criterion for pit stability is assumed to be the maintenance of a critical pit solution concentration at the pit surface, which requires the maximum pit dissolution current density to be equal to or greater than the diffusion current density associated with this critical concentration. The resulting model can explain many observations of nature of the CPT. The CPT is shown not to be a single-valued critical value; instead, it is a statistically distributed value based on the detailed behavior of many pitting events. For potentiostatic measurements, the measured CPT is just the temperature at which the first stable pit forms. The commonly recognized and tightly distributed CPT is determined from the perspective of pit growth stability and it represents the temperature with the highest probability to form the first stable pit.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]
  1. The Ohio State Univ., Columbus, OH (United States). Fontana Corrosion Center
  2. Univ. of Virginia, Charlottesville, VA (United States). Center for Electrochemical Science and Engineering
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:
1440384
Alternate Identifier(s):
OSTI ID: 1509862
Grant/Contract Number:  
SC0016584
Resource Type:
Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 9; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CPT; critical pitting temperature; pitting corrosion

Citation Formats

Li, Tianshu, Scully, J. R., and Frankel, G. S. Localized Corrosion: Passive Film Breakdown vs Pit Growth Stability: Part II. A Model for Critical Pitting Temperature. United States: N. p., 2018. Web. doi:10.1149/2.0591809jes.
Li, Tianshu, Scully, J. R., & Frankel, G. S. Localized Corrosion: Passive Film Breakdown vs Pit Growth Stability: Part II. A Model for Critical Pitting Temperature. United States. doi:10.1149/2.0591809jes.
Li, Tianshu, Scully, J. R., and Frankel, G. S. Tue . "Localized Corrosion: Passive Film Breakdown vs Pit Growth Stability: Part II. A Model for Critical Pitting Temperature". United States. doi:10.1149/2.0591809jes.
@article{osti_1440384,
title = {Localized Corrosion: Passive Film Breakdown vs Pit Growth Stability: Part II. A Model for Critical Pitting Temperature},
author = {Li, Tianshu and Scully, J. R. and Frankel, G. S.},
abstractNote = {Potentiostatic temperature-scanned experiments were performed on 316L stainless steel and revealed that both the measured values of critical pitting temperature (CPT) and their distribution ranges increased with the decrease of the aggressiveness of exposure conditions. Previous models for CPT cannot explain these observations, so a model for CPT is proposed based on criteria for pit growth stability with added effects of the passive film breakdown. The criterion for pit stability is assumed to be the maintenance of a critical pit solution concentration at the pit surface, which requires the maximum pit dissolution current density to be equal to or greater than the diffusion current density associated with this critical concentration. The resulting model can explain many observations of nature of the CPT. The CPT is shown not to be a single-valued critical value; instead, it is a statistically distributed value based on the detailed behavior of many pitting events. For potentiostatic measurements, the measured CPT is just the temperature at which the first stable pit forms. The commonly recognized and tightly distributed CPT is determined from the perspective of pit growth stability and it represents the temperature with the highest probability to form the first stable pit.},
doi = {10.1149/2.0591809jes},
journal = {Journal of the Electrochemical Society},
number = 9,
volume = 165,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1149/2.0591809jes

Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

Figures / Tables:

Figure 1 Figure 1: (a) Current-time/temperature curves obtained from potentiostatic CPT measurements at 700 mV on the air-oxidized SS316L with working electrode area of 0.19∼0.21 cm2 in 0.6 M NaCl; (b) Metastable pitting transients observed in the outlier experiment at temperatures well above the tight distribution range of CPTs in the othermore » runs.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.