Electrochemical characterization of mild steel in alkaline solutions simulating concrete environment
By Enrico Volpi and Andrea Olietti and Matteo Stefanoni and Stefano P. Trasatti
Published in Journal of Electroanalytical Chemistry
NULL
2015
Abstract
The majority of the studies on corrosion mechanism and protection of reinforcing steel bars are performed in alkaline solutions simulating the concrete environment, thus avoiding the complications related to the preparation of representative reinforced concrete samples. In this work the electrochemical behavior of \B450C\ mild steel was studied in saturated Ca(OH)2 solution by cyclicvoltammetry. Comparison with the electrochemical response in 1 M NaOH was also carried out, being such electrolyte the most commonly used for iron passivation studies. Results confirm the coexistence of two main processes, one leading to Fe(OH)2 and the following (reversible) to Fe(III) oxo-hydroxides. The latter appears more relevant to the growth of a protective layer and in turn strictly connected to the operative condition of the cyclic voltammetry. The influence that time has on the passive film growth was then investigated by means of anodic polarization and electrochemical impedance spectroscopy. All the results indicated that at least three days of immersion in Ca(OH)2 are required to guarantee the stabilization of the electrochemical response, thus leading to a protection similar to that observed with reinforced concrete.
Microsoft is Ending Support for Windows 7
Microsoft will discontinue support for Windows 7 on January 14, 2020 which means Gamry will also be discontinuing support for Windows 7. If you are upgrading to Windows 10, like many companies and institutions, you need to be running Version 7 of our s oftware . Please note that only USB and Ethernet-based instruments can run in Version 7. Eligible users can download the latest version of our software through our online Client Portal .
If you haven't already registered your instrument, you can do so through the Client Portal .
Please email Technical Support if you have any questions regarding this transition. Please be sure to include your instrument model and serial number when contacting us.