J. Mater. Sci. Technol. ›› 2022, Vol. 107: 197-206.DOI: 10.1016/j.jmst.2021.06.079

• Research Article • Previous Articles     Next Articles

Effect of aging treatment on microstructure and corrosion behavior of a Fe-18Cr-15Mn-0.66N stainless steel

Yanxin Qiaoa, Xinyi Wanga, Lanlan Yanga,*(), Xiaojing Wanga, Jian Chena, Zhengbin Wangb,*(), Huiling Zhoua, Jiasheng Zoua, Fuhui Wangc,d   

  1. aSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
    bCAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    cSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
    dLaboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China
  • Received:2021-04-15 Revised:2021-04-15 Accepted:2021-04-15 Published:2022-04-30 Online:2022-04-28
  • Contact: Lanlan Yang,Zhengbin Wang
  • About author:zbwang12s@imr.ac.cn (Z. Wang).
    *:E-mail addresses: lanlanyang@just.edu.cn (L. Yang),

Abstract:

The effect of aging treatment on the microstructure and corrosion behavior of a Fe-18Cr-15Mn-0.66N high-nitrogen stainless steel (HNSS) in 3.5 wt.% NaCl solution was investigated using a series of electrochemical tests, scanning electronic microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that the aging treatment led to the precipitation of Cr2N particles along the grain boundaries and their morphologies changed from dispersive particles to continuous network as the aging time increased up to 60 min. Aging time had minor effects on the corrosion potential and corrosion current density, but resulted in the sharp decrease in the pitting corrosion potential. The passive film behaved as a n-type semiconductor, and the donor density of the passive film increased with the aging time. Meanwhile, the fraction of stable oxide (Cr2O3) in the passive film decreased with the aging time. It demonstrates that the aging treatment deteriorated the protectiveness of the passive film, hence weakened the corrosion resistance of HNSS.

Key words: High-nitrogen stainless steel, Corrosion, Aging treatment, Passive film