1.Anhui Key Laboratory of High Performance Nonferrous Metal Materials，Anhui Polytechnic University，Wuhu 241000，China；2.Key Laboratory of Marine Materials and Related Technologies，Zhejiang Key Laboratory of Marine Materials and Protective Technologies，Ningbo Institute of Materials Technology and Engineering，Chinese Academy of Sciences，Ningbo 315201，China；3.School of Materials Science and Engineering，Kunming University of Science and Technology，Kunming 650093，China；4.School of Opto-Electronic Engineering，Changchun University of Science and Technology，Changchun 130022，China；5.Ningbo Oriental Cable Co.，Ltd.，Ningbo 315801，China
Aiming at the electromagnetic corrosion behavior of 2507 super duplex stainless steel used for ocean umbilical cable，the effects of electromagnetic field changes on the electrochemical properties of 2507 super duplex stainless steel in simulated seawater were studied by potentiodynamic polarization，electrochemical impedance spectroscopy and Mott Schottky analysis.Subsequently，SEM and EDS were used to analyze the corrosion morphology and products of 2507 super duplex stainless steel.Results showed that the electromagnetic field could promote the corrosion of 2507 super duplex stainless steel in 3.5%NaCl solution.As the intensity of the electromagnetic field increased，self-corrosion potential and the impedance decreased，so the corrosion became more serious.Meanwhile，the passivation film semiconductor formed by 2507 super duplex stainless steel in 3.5%NaCl solution generated P-N conversion，and the higher the excitation current，the more negative the conversion potential.
