Out-field detection device and method for detecting passivation feature of stainless steel

A method for detecting a passivation feature of stainless steel, comprising:

• using an out-field stainless steel substrate as a working electrode and connecting the out-field stainless steel substrate with a working electrode interface of an electrochemical workstation;
• penetrating a metal electrode through a passivation solution container to make one end of the metal electrode be connected with a counter electrode of the electrochemical workstation, and the other end of the metal electrode be inserted into the passivation solution container;
• injecting a passivation solution into the passivation solution container to make the other end of the metal electrode contact with the passivation solution, and covering the passivation solution container with a cover glass;
• activating the electrochemical workstation to monitor an open circuit potential of a contact interface between the out-field stainless steel substrate and the passivation solution until the open circuit potential reaches a stable state;
• measuring a polarization curve of the contact interface using the electrochemical workstation;
• activating a Raman spectrometer and a Raman laser emission source to obtain a Raman spectrum of the passivation solution;
• determining, based on the Raman spectrum, a Raman feature peak intensity;
• determining, based on a correlation model, the Raman feature peak intensity, and the polarization curve, a passivation feature of the out-field stainless steel substrate, the correlation model representing a correspondence between a plurality of Raman feature peak intensities and a plurality of standard solution concentrations, and each of the standard solution concentrations not exceeding 0.1 M.