Abstract
The pitting corrosion behavior of HRB400 steel in various simulated concrete environments was investigated by the combination of polarization curves and statistical method. The results indicated that the chloride concentration threshold ([Cl−]th) for pitting of the steel was greatly affected by pH when the applied potential exists, which is always caused by random stray current. The interaction of applied potential and chloride concentration on the pitting behavior was discussed. Finally, pitting-risk-evaluation diagrams were built up, which could be easily used to assess the pitting risk of reinforcing bars under the chloride-containing environment with stray current.
Highlights
As one of the most basic building materials in widespread use during the past decades, reinforced concrete has endured many extreme conditions and shown long term durability [1]
It is worth mentioning that random stray current may exist for reinforced concrete structures that are near a direct current supply [29]
This would affect the potential of the reinforcing steel in a manner which may be beyond the pitting potential under certain chloride concentrations
Summary
As one of the most basic building materials in widespread use during the past decades, reinforced concrete has endured many extreme conditions and shown long term durability [1]. It is worth mentioning that random stray current may exist for reinforced concrete structures that are near a direct current supply (such as a subway line) [29] This would affect the potential of the reinforcing steel in a manner which may be beyond the pitting potential under certain chloride concentrations. It is still necessary to enhance the basic research on the corrosion of reinforcing steel in concrete under applied potential circumstances caused by random stray current through statistical methods. For certain pH values, the relation between applied potentials and the corresponding critical value of chloride concentration is established to assess the corrosion risk of reinforcing steel when it is affected by stray current
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