Understanding the Interactions of Multiple Pits Under Freely Corroding Conditions

Katona, Ryan Michael; Roop, Matthew Lawrence; Venkatraman, Aditya; Montes de Oca Zapiain, David; Schaller, Rebecca F.

doi:10.1149/1945-7111/ad9415

Title: Understanding the Interactions of Multiple Pits Under Freely Corroding Conditions

Journal Article · 10 December 2024 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/1945-7111/ad9415 · OSTI ID:2480609

^[1]; Roop, Matthew Lawrence ^[2]; Venkatraman, Aditya ^[1];

^[1]; Schaller, Rebecca F. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States)

The interactions of two propagating pits on a single cathode surface were evaluated across variations in chloride concentration, water layer (WL), pit sizes, separation distance (x₂), and cathode size (L_Cath) under freely corroding conditions using Finite Element Methods (FEM). Calculated FEM current was utilized to predict stability based on the Galvele pit stability product. FEM predictions were utilized to train a neural network machine learning model for rapid stability predictions. Pit one is in the center of a circular cathode while pit two moves radially from the center pit. With two pits, the overall current in each pit is decreased with respect to a single pit, however, the total current is increased. Increasing WL and LCath generally increased overall current in each pit and increased predicted maximum pit sizes. Increasing x₂ decreased current in pit two due to less cathode being available to support dissolution in proximity to pit two. Increasing chloride concentration from 0.6 to 3 M NaCl increased current, while increasing from 3 to 5.3 M NaCl decreased current. An overall increase in predicted pit size with increase in chloride concentration is predicted. A machine learning model was created to predict current and maximum pit size and captured underlying physics and predicted stability across the multidimensional parameter space.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 2480609

Report Number(s):: SAND--2025-02996J

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 12 Vol. 171; ISSN 0013-4651

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
atmospheric corrosion
finite element modeling
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Title: Understanding the Interactions of Multiple Pits Under Freely Corroding Conditions

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