Stainless steel (SS) reinforcement has been increasingly used in marine substructures due to its superior corrosion resistance over that of plain carbon steel (CS) despite its greater material cost. While investigations have thoroughly addressed the reliability of corrosion detection techniques of CS reinforcement, very little work has addressed the variations in the applicability of these techniques to stainless steel reinforcement. This study evaluates the sensitivity of traditional corrosion detection methods such as half-cell potential and electrochemical impedance spectroscopy to stainless steel corrosion in concrete. Reinforced concrete specimens incorporating either plain carbon steel or stainless steel were designed to promote macrocell corrosion. The specimens were monitored for corrosion activity using half-cell potential and electrochemical impedance spectroscopy without a guard ring. Corrosion detection sensitivity was assessed by comparison to experimental results of analog specimens in the form of small concrete cylinders in which the uncertainty in the measurement results is minimized. Additionally, finite element simulations are used to further specify the limitations of each method. As a result of this work, modifications to existing methods or recommendation for more suitable methods will be provided for corrosion detection of stainless-steel reinforced concrete.

Subject
Steel reinforcement, Electrochemical impedance spectroscopy, Cylinders, Modeling, Corrosion rate, Corrosion detection, Corrosion modeling, Stainless steel, Elements, Chlorides, Concrete, Reinforcement, Anodes
Keywords:
Stainless steel, non-destructive techniques, half-cell potential, electrochemical impedance
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2021
Association for Materials Protection and Performance (AMPP)
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