Effect of Tempering Time on Corrosion Resistance of High Co-Ni Steel

作者：Wang, Xin-yuan; Liu, Xin-yi; Wang, Chen-chong; Li, Tian-xiang; Liu, Duo; Wang, Xu; Ren, Jian-min^*; Huang, J. C.

来源：International Journal of Electrochemical Science, 2022, 17(12): 221216.

DOI：10.20964/2022.12.17

• High Co-Ni steel
• Tempering temperatures
• Corrosion behavior
• Microstructure
• Electrochemical corrosion

The present study attempts to improve corrosion resistant of high Co-Ni steel in similar to 1.0 wt% NaCl environment at 25 degrees C (room temperature) by different tempering times. Microstructures of specimens were characterized by X-ray diffraction (XRD), and scanning electron microscopy (SEM). The corrosion behavior was evaluated by polarization curve and electrochemical impedance spectroscopy. Firstly, the tempering time has a great influence on the morphology of martensite lath in high Co-Ni steel. Secondly, it was observed from the experimental data that a passivation/oxide layer with N-type semiconductor behavior was formed on all the samples studied in this paper. Increasing the tempering time can move the corrosion potential forward. Finally, tempering time of 16 h effectively improves the overall stability of the sample surface and reduces the corrosion tendency of the sample.

• 单位
  东北大学