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Title: Direct observation of pitting corrosion evolutions on carbon steel surfaces at the nano-to-micro- scales

Abstract

The Cl¯-induced corrosion of metals and alloys is of relevance to a wide range of engineered materials, structures, and systems. Because of the challenges in studying pitting corrosion in a quantitative and statistically significant manner, its kinetics remain poorly understood. Herein, by direct, nano- to micro-scale observations using vertical scanning interferometry (VSI), we examine the temporal evolution of pitting corrosion on AISI 1045 carbon steel over large surface areas in Cl¯-free, and Cl¯-enriched solutions. Special focus is paid to examine the nucleation and growth of pits, and the associated formation of roughened regions on steel surfaces. By statistical analysis of hundreds of individual pits, three stages of pitting corrosion, namely, induction, propagation, and saturation, are quantitatively distinguished. By quantifying the kinetics of these processes, we contextualize our current understanding of electrochemical corrosion within a framework that considers spatial dynamics and morphology evolutions. In the presence of Cl¯ ions, corrosion is highly accelerated due to multiple autocatalytic factors including destabilization of protective surface oxide films and preservation of aggressive microenvironments within the pits, both of which promote continued pit nucleation and growth. Furthermore these findings offer new insights into predicting and modeling steel corrosion processes in mid-pH aqueous environments

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1500090
Grant/Contract Number:  
NE0008398
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Guo, Peng, La Plante, Erika Callagon, Wang, Bu, Chen, Xin, Balonis, Magdalena, Bauchy, Mathieu, and Sant, Gaurav. Direct observation of pitting corrosion evolutions on carbon steel surfaces at the nano-to-micro- scales. United States: N. p., 2018. Web. doi:10.1038/s41598-018-26340-5.
Guo, Peng, La Plante, Erika Callagon, Wang, Bu, Chen, Xin, Balonis, Magdalena, Bauchy, Mathieu, & Sant, Gaurav. Direct observation of pitting corrosion evolutions on carbon steel surfaces at the nano-to-micro- scales. United States. doi:10.1038/s41598-018-26340-5.
Guo, Peng, La Plante, Erika Callagon, Wang, Bu, Chen, Xin, Balonis, Magdalena, Bauchy, Mathieu, and Sant, Gaurav. Tue . "Direct observation of pitting corrosion evolutions on carbon steel surfaces at the nano-to-micro- scales". United States. doi:10.1038/s41598-018-26340-5. https://www.osti.gov/servlets/purl/1500090.
@article{osti_1500090,
title = {Direct observation of pitting corrosion evolutions on carbon steel surfaces at the nano-to-micro- scales},
author = {Guo, Peng and La Plante, Erika Callagon and Wang, Bu and Chen, Xin and Balonis, Magdalena and Bauchy, Mathieu and Sant, Gaurav},
abstractNote = {The Cl¯-induced corrosion of metals and alloys is of relevance to a wide range of engineered materials, structures, and systems. Because of the challenges in studying pitting corrosion in a quantitative and statistically significant manner, its kinetics remain poorly understood. Herein, by direct, nano- to micro-scale observations using vertical scanning interferometry (VSI), we examine the temporal evolution of pitting corrosion on AISI 1045 carbon steel over large surface areas in Cl¯-free, and Cl¯-enriched solutions. Special focus is paid to examine the nucleation and growth of pits, and the associated formation of roughened regions on steel surfaces. By statistical analysis of hundreds of individual pits, three stages of pitting corrosion, namely, induction, propagation, and saturation, are quantitatively distinguished. By quantifying the kinetics of these processes, we contextualize our current understanding of electrochemical corrosion within a framework that considers spatial dynamics and morphology evolutions. In the presence of Cl¯ ions, corrosion is highly accelerated due to multiple autocatalytic factors including destabilization of protective surface oxide films and preservation of aggressive microenvironments within the pits, both of which promote continued pit nucleation and growth. Furthermore these findings offer new insights into predicting and modeling steel corrosion processes in mid-pH aqueous environments},
doi = {10.1038/s41598-018-26340-5},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 4 works
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Figures / Tables:

Figure 1 Figure 1: Representative frequency diagrams showing the distribution of height differences across different pixel locations for AISI 1045 steel reacting with: (a) DI water, and (b) 100 mM NaCl solution. The height difference is calculated by subtracting the heights at a given (x, y) location at the respective times indicatedmore » in the legend from that at t = 0 h. As such, negative height differences indicate mass loss (e.g., pit formation, and surface roughening), and positive height differences indicate the deposition of corrosion products. (c) and (d) are the distributions over the height range of −5 to 5 μm, showing in more detail the respective height distributions in (a) and (b).« less

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