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Current and potential transient during repassivation at freely corroding conditions [Elektronski vir]
Zajec, Bojan ; Kosec, Tadeja ; Legat, Andraž
Many corrosion prevention techniques are available when it comes to corrosion of steel in concrete, ranging from epoxy coatings, the use of corrosion inhibitors, adequate concrete quality, cathodic ...protection, etc. The use of stainless steel is also one of the possible corrosion prevention methods. Stainless steels are underutilized in this application mainly due to the initial higher costs of the project. It has been proven, both in the field and in the laboratory, that commonly used austenitic stainless steels adequately prevent corrosion from initiating in concrete exposed to saline environment. In this study different physical and electrochemical techniques will be used to monitor corrosion of stainless steel (type 304) embedded in mortar specimens made of Portland cement (CEM I). Two of these techniques, electrical resistance (ER) sensor and coupled multi-electrode array (CMEA), require custom design sensors embedded in concrete. The other three techniques are more conventional and include electrochemical impedance spectroscopy (EIS), coupling current measured through a resistor and galvanostatic pulse technique, which is a linear polarization technique adapted for corrosion measurement of steel in concrete. All mortar specimens will be exposed to cyclic ponding with sodium chloride solution. The cycle will last for a week, with 2 days of wetting and 5 days of drying. The total exposure time will be at least 2 years, depending on the technique and measuring equipment availability. Scanning electron microscopy, optical microscopy, computed tomography and EDS analysis will be used for analysis after the specimens will be demolished at the end of exposure. Measurements using different physical and electrochemical techniques will be analyzed and a detailed investigation of the type of stainless steel corrosion in concrete will be conducted. Corrosion rates from each technique will be calculated and compared, giving a good assessment of the usability of the technique for stainless steel corrosion monitoring. The results will also be compared with carbon steel corrosion measurements previously conducted in identical conditions.
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