Title:
High-Throughput Analysis of the Kinetics of Chloride-Induced Passive Layer Breakdown in Different Carbon Steel Microstructures within Simulated Concrete Pore Solution
Author(s):
Gisoo Daviran and Amir Poursaee
Publication:
Symposium Paper
Volume:
366
Issue:
Appears on pages(s):
57-65
Keywords:
Concrete, Corrosion, Martensite, Pearlite, Pore solution, SECM
DOI:
Date:
10/1/2025
Abstract:
Carbon steel bars are critical in steel-reinforced concrete structures and their corrosion leads to significant deterioration. Using a high-throughput approach, this study explored the kinetics of passive layer breakdown on different microstructures within a carbon steel reinforcing bar. Thermomechanically treated steel bars with three
distinct microstructures (martensite in the outer layer, bainite in the middle, and pearlite in the center) were vertically cut and immersed in the simulated concrete pore solution. After 24 hours of immersion, the solution was contaminated with 0.8M chloride ions. Scanning Electrochemical Microscopy (SECM) was employed to study the kinetics of the passive layer breakdown on each microstructure. The results showed that the breakdown of the passive layer was a time-dependent process and that the microstructure influenced its kinetics.