Influence of Chloride Ions on Corrosion Behavior of Steel Bars in a Simulated Concrete Pore Solution

Hongwei Wu
2019 International Journal of Electrochemical Science  
The performance of steel bars deteriorates under chloride corrosion. It is thus essential to study the corrosion mechanism of different steel bars to better understand the corrosion of steel bars in concrete structures. In this study, electrochemical techniques and scanning electron microscopy are used to study different steel bars in a simulated concrete pore solution after different numbers of days. The findings suggest that each sample's free corrosion potential, impedance arc radius, and
more » ... arc radius, and dispersion parameter decrease as the corrosion rate increases. When corrosion begins, the passive film remains unchanged, and one time constant is observed. Then, when the passive film is destroyed, two time constants appear. The pits exhibit a stepped structure with a discrete diameter and penetrate to the bottom of the passive layer. As the corrosion proceeds, the pits begin to overlap. The steel bar's fractal dimension first increases and then decreases. These results describe both the average characteristics and the details of the corrosion, providing theoretical guidance for choosing steel bars and monitoring corrosion.
doi:10.20964/2019.06.52 fatcat:c377ipu64va27ethio64ugyh7i