Detection of stress corrosion cracking dynamics by dynamic electrochemical impedance spectroscopy

A novel dynamic electrochemical impedance spectroscopy (DEIS) technique has been developed that offers the possibility to determine impedance characteristics in a time domain during the rupture of the protective passive layer. This ability is associated with the analysis methodologyof the technique, which enables selective time–frequency analysis of the measurement data. This paper proposes that the DEIS technique allows the acquisition of instantaneous changes during the passive layer cracking process, which is strongly related to the initiation stage of stresscorrosion cracking. Moreover, the principles of application of the novel method in such investigations are discussed.