The corrosion behavior of NiCu low alloy steel and Q235 low carbon steel as the candidate materials for geological disposal containers of high-level radioactive waste in the simulated Beishan groundwater was comparatively studied by weight loss test,electrochemical measurements,scanning electron microscope(SEM),electron probe microanalysis(EPMA),X-ray diffraction(XRD),Raman spectrum and X-ray pho-toelectron spectroscopy(XPS).The electrochemical results showed that the corrosion potential of NiCu steel and Q235 steel gradually increased with the immersion time.Simultaneously,the cathodic process transited from hydrogen evolution reaction(HER)control to the rust reduction control,while the anodic process was always dominated by the active dissolution of iron.By comparison,both the cathodic resis-tance and the anodic dissolution resistance of NiCu steel corrosion were apparently higher than that of Q235 steel.The results of rust layer characterization indicated that Ni and Cu elements could be enriched in the inner rust layer of NiCu steel and the rust layer was more compact.As the main corrosion prod-ucts,the content of α-FeOOH in the rust layer of NiCu steel was obviously increased more than that of Q235 steel.Fe6(OH)12SO4 stably existed in the corrosion products of NiCu steel because Ni(Ⅱ)or Cu(Ⅱ)could substitute Fe(Ⅱ)of Fe6(OH)12SO4 and increased its oxidation resistance.Moreover,Ni and Cu could also make Fe3O4 ionic selective by doping.After the long-term immersion,the corrosion mass loss of NiCu steel was significantly lower than Q235 steel,which further confirmed the benefits of Ni and Cu alloying on improving the steel corrosion resistance.

Yupeng Sun;Xin Wei;Junhua Dong;Nan Chen;Hanyu Zhao;Qiying Ren;Wei Ke

School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Environmental Corrosion Centre of Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

材料科学技术（英文版）

[1]Yupeng Sun;Xin Wei;Junhua Dong;Nan Chen;Hanyu Zhao;Qiying Ren;Wei Ke-.Understanding the role of alloyed Ni and Cu on improving corrosion resistance of low alloy steel in the simulated Beishan groundwater)[J].材料科学技术（英文版）,2022(35):124-135

Beishan,Fe6,12SO4

Understanding,role,alloyed,improving,corrosion,resistance,steel,simulated,groundwater,behavior,NiCu,Q235,carbon,candidate,materials,geological,disposal,containers,level,radioactive,waste,comparatively,studied,by,weight,loss,test,electrochemical,measurements,scanning,microscope,probe,microanalysis,EPMA,ray,diffraction,Raman,spectrum,pho,toelectron,spectroscopy,XPS,results,showed,that,potential,gradually,increased,immersion,Simultaneously,cathodic,process,transited,from,hydrogen,evolution,reaction,HER,control,rust,reduction,while,anodic,always,dominated,dissolution,iron,By,comparison,both,were,apparently,higher,than,layer,characterization,indicated,elements,could,enriched,inner,more,compact,main,content,FeOOH,obviously,stably,existed,products,because,substitute,oxidation,Moreover,also,make,Fe3O4,ionic,selective,doping,After,long,term,mass,significantly,lower,which,further,confirmed,benefits,alloying

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