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 elec-trochemical 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 parti-cles 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 poten-tial 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.

Yanxin Qiao;Xinyi Wang;Lanlan Yang;Xiaojing Wang;Jian Chen;Zhengbin Wang;Huiling Zhou;Jiasheng Zou;Fuhui Wang

School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China

材料科学技术（英文版）

[1]Yanxin Qiao;Xinyi Wang;Lanlan Yang;Xiaojing Wang;Jian Chen;Zhengbin Wang;Huiling Zhou;Jiasheng Zou;Fuhui Wang-.Effect of aging treatment on microstructure and corrosion behavior of a Fe-18Cr-15Mn-0.66N stainless steel)[J].材料科学技术（英文版）,2022(12):197-206

HNSS

Effect,aging,treatment,microstructure,corrosion,behavior,18Cr,15Mn,66N,stainless,steel,high,nitrogen,wt,NaCl,solution,was,investigated,using,series,trochemical,tests,scanning,electronic,microscopy,ray,diffraction,photoelectron,spectroscopy,XPS,results,showed,that,led,precipitation,Cr2N,along,grain,boundaries,their,morphologies,changed,from,dispersive,particles,continuous,network,increased,up,Aging,had,minor,effects,current,density,but,resulted,sharp,pitting,potential,passive,film,behaved,type,semiconductor,donor,Meanwhile,stable,oxide,Cr2O3,decreased,It,demonstrates,deteriorated,protectiveness,hence,weakened,resistance

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