Online monitoring and regulating method for chloride molten salt corrosion

The invention discloses an online monitoring and regulating method for chloride molten salt corrosion. The method comprises the following steps: obtaining a polarization curve of a working electrode in molten salt to be tested under different addition amounts of magnesium metal by a corrosion electrochemical testing method; determining corrosion control indexes including corrosion potential, corrosion current density and linear polarization resistance; and detecting the corrosion potential, the corrosion current density and the linear polarization resistance of the molten salt to be tested online; monitoring the corrosivity of the molten salt to be tested on line, and when the corrosion index (corrosion potential, corrosion current density or linear polarization resistance) of the onlinedetection does not meet a molten salt corrosion control index, adding a proper amount of magnesium metal into the molten salt to be tested to enable the index of the online detection to reach the corrosion control index range,