Corrosion Behavior Study of 22MnB5 Steel and its Weld Using Electrochemical Method

Corrosion behaviors of ultra high strength steel 22MnB5 and its weld were studied based on electrochemical method in the present work. Electrochemical measurements such as Tafel polarization curve and electrochemical impedance spectroscopy were performed to investigate the corrosion mechanisms of 22MnB5 steel and its weld. The testing results indicated the weld metal possessed less corrosion resistance than the base metal, and the main reason for this phenomenon is the microstructure variation of the weld metal.