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An in situ optical second harmonic generation study of carbon steel in contact with an alkaline aqueous solution containing glutamic acid

In this paper we report a spectroelectrochemical investigation—relevant to the elucidation of rebar corrosion processes—based on in situ optical second‐harmonic generation spectroscopy. We studied the corrosion behaviour of a carbon steel electrode in contact with an alkaline aqueous solution—simulating the electrolyte of freshly prepared cement paste—containing glutamic acid, a candidate corrosion inhibitor 1 . The non‐linear time‐dependent optical response to exciting radiation at 1064 nm has been recorded as a function of applied potential. This approach allows to obtain detailed information regarding the dynamic electronic structure of the corrosion interface, which is not available from other electrochemical or spectroelectrochemical approaches.