Abstract
The process of passivation of carbon steel when experiencing plastic deformation in simulated pore solution has been studied using electrochemical tests and atomic force microscopy (AFM). The polarization results show that the activity of the carbon steel increased with increasing degree of deformation. Before the passive films were ruptured, the heavily deformed samples presented a high open circuit potential (OCP). On the other hand, the pitting incubation time decreased with increasing plastic deformation. The Mott-Schottky results suggested that the high deformation caused the passive films to be heavily doped. In addition, the space charge layers of passive films were thinned when the plastic deformation increased. The AFM observations indicated that the passive films become more inhomogeneous as the deformation increased. These results demonstrate that passive films on the deformed carbon steel become unstable when the plastic deformation increases.
Highlights
Under normal conditions, the high alkalinity of concrete promotes the formation of a stable passive film on the steel bar, protecting it from corrosion
The results showed that the critical chloride concentration, which was related to the rupture of passive films, decreased as the tensile stress increased
In a cement extract solution, the open circuit potential (OCP) of carbon steel increases with increasing plastic deformation, while the pitting incubation time decreases as the plastic deformation increases
Summary
The high alkalinity of concrete promotes the formation of a stable passive film on the steel bar, protecting it from corrosion. The results showed that the critical chloride concentration, which was related to the rupture of passive films, decreased as the tensile stress increased. The influence of plastic deformation on the structure of passive films for carbon steel was studied in cement extract.
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