Abstract: Optical microscopy was used to analyze the microstructures of AF1410 steel welded joints after being electron beam welded.The corrosion resistant performance and the electrochemical behavior of the melting area and the base metal were also analyzed using the neutral salt spray corrosion weight loss and electrochemical testing methods.The results show that there are the thick tempered martensite and the precipitated carbides on the electron beam welding seam,and the corrosion weight of the base metal is less than that of the melting area.Electrochemical testing results indicate that the open circuit potential of the melting area is lower,the corrosion current is higher and the impedance is also lower than that of the base metal,and the melting area is more susceptible to corrosion.This is due to the electrochemical reaction driven by the potential difference between the tempered martensite and the carbide precipitation,which causes the corrosion failure of the material in the corrosion medium.