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high temperature corrosion of Fe-25Cr and Fe-17Cr-1.5Si-0.5Al Alloys in Oxidizing and Sulfidizing Enviornments

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工程科学学报 1989年第6期 604-610页

作者：王才荣公茂秀张文奇朱日彰

The simultaneous oxidation and sulfidation of Fe 25Cr and Fe-17Cr-l.5Si-0.5Al alloys was studied at 1023K and 1223K in H2-H2O-H2S gas mixtures. The kinetic boundary which indicates the transition from oxide to sulfide has heen found in these two alloys. The critical oxygen partial pressures of Fel7Crl.5SiO.5Al alloys were systematically lower than those of Fe-25Cr alloy. The reaction kinetics were measured by the stainless steel spring balance, and the reaction products were characterized by X-ray diffraction and scanning electron microscopy. The reaction rate usually decreased with the increase of the oxygen partial pressure at the constant sulfur partial pressure. The exista-nce of silicon plays an important role to suppress the sulfidation of Fel7Cr alloy.

关键词： high temperature corrosion Fe-Cr alloy oxidizing sulfidizing

Role of welding residual strain and ductility dip cracking on corrosion fatigue behavior of Alloy 52/52M dissimilar metal weld in borated and lithiated high-temperature water

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Journal of Materials Science & Technology 2020年第7期42卷 163-174页

作者： Jun Gao Jibo Tan Ming Jiao Xinqiang Wu Lichen Tang Yifeng Huang CAS Key Laboratory of Nuclear Materials and Safety Assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Shanghai Nuclear Engineering Research and Design Institute Shanghai200233China

corrosion fatigue behavior of Alloy 52/52 M dissimilar metal weld(DMW)was investigated in borated and lithiated high-temperature water.The fatigue life of Alloy 52/52 M DMW in high-temperature water decreased in comparison with that in air.The fatigue cracks initiated at Alloy 52 M butt weld or at the interface of Alloy 52 buttering and Alloy 52 M butt weld.The welding residual strain and ductility dip cracking in Alloy 52 M butt weld promoted the initiation and propagation of fatigue cracks.The environmentally assisted fatigue damage in high-temperature water is discussed by taking account of microstructure defects.

关键词： Superalloys corrosion fatigue high temperature corrosion Welding

Uniform corrosion behavior of FeCrAl alloys in borated and lithiated high temperature water

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Journal of Materials Science & Technology 2021年第11期70卷 136-144页

作者： Fangqiang Ning Xiang Wang Ying Yang Jibo Tan Ziyu Zhang Dan Jia Xinqiang Wu En-Hou Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China ATF R&D Project Department China Nuclear Power Technology Research Institute Co.Ltd.Shenzhen 518026China

The uniform corrosion behavior of model FeCrAl alloys as well as commercial Zircaloy-4 as reference material were investigated in 360℃borated and lithiated water.The results reveal that FeCrAl alloys exhibited better corrosion resistance than Zircaloy-4.It is found that the oxide films formed on the FeCrAl alloys are composed of outer Fe_(3)O_(4)layer,inner layer consisting of compact spinel layer and porous spinel layer,and transition layer containing Al-Cr-rich oxides and matrix enriched with Fe°.The spinel oxides in the inner layer are FeFe_(2-x-y-z)Cr_(x)Al_(y)MozO_(4).The corrosion mechanism of FeCrAl alloys in high temperature water is discussed.

关键词： FeCrAl Alloys high temperature corrosion Oxidation SEM TEM

Effect of temperature on corrosion behavior of alloy 690 in high temperature hydrogenated water

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Journal of Materials Science & Technology 2018年第8期34卷 1419-1427页

作者： Jiazhen Wang Jianqiu Wang Hongliang Ming Zhiming Zhang En-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Reactor Engineering Research Sub-lnstitute Nuclear Power Institute of ChinaChengdu 610213China

The influence of temperature on the corrosion behavior of Alloy 690 is evaluated using potentiodynamic polarization curves, electrochemical impedance spectra （EIS）, scanning electron microscopy （SEM）, X- ray photoelectron spectroscopy （XPS） and transmission electron microscopy （TEM）. The corrosion rate of Alloy 690 reaches a local maximum at 250℃. The kinetic control step of the growth of oxide film changes from the diffusion process of aqueous-phase ions to the growth of Cr-rich barrier layer in the temperature range of 200-300 ℃. A modified double-layer model is proposed to describe the effect of temperature on the structure and composition of the oxide film.

关键词： Alloy Polarization EIS SEMTEM high temperature corrosion

INFLUENCES OF SMALL AMOUNTS OF Y AND Ce ON high temperature corrosion PROPERTIES OF M38 ALLOY

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Transactions of Nonferrous Metals Society of China 1992年第3期2卷 72-76页

作者： Qi Hubin Wang Shujuan Li Tiefan University of Science and Technology Beijing 100083China Northeast University of Technology Institute of corrosion and Protection of Metals Academia Sinica

high temperature corrosion properties of M38 alloy with and without 0.04 wt-%Y and 0.05 wt-%Ce additions were studied in equilibrated S0_(2)+0_(2)gas mixtures at 850℃and 900℃.It was found that adding Y or Ce decreased the corrosion rate of M38 and changed considerably the surface morphologies and composition of corrosion products on M38.The effectiveness of Y and Ce were also discussed.

关键词： Y Ce M38 alloy SO_(2)+O_(2)mixtures high temperature corrosion

Effects of surface grinding for scratched alloy 690TT tube in PWR nuclear power plant:Microstructure and stress corrosion cracking

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Journal of Materials Science & Technology 2022年第18期113卷 229-245页

作者： Bin Wu Hongliang Ming Fanjiang Meng Yifeng Li Guangqing He Jianqiu Wang En-Hou Han School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shanghai Nuclear Engineering Research and Design Institute Ltd.Co. Shanghai 200233China Instrumental Analysis and Research Center Shanghai UniversityShanghai 200444China Department of Materials Science Fudan UniversityShanghai 200433China Shanghai Electric Nuclear Power Equipment Co. Ltd.Shanghai 201306China

Alloy 690TT tube samples with different scratch depths were repaired by grinding treatments using abra-sive papers of two different particle sizes.The microstructure and stress corrosion cracking(SCC)behavior were studied in detail.During grinding,the plastic accumulation zone vulnerable to SCC was removed.Meanwhile,some residual slip steps remained in the scratched area.corrosion tests lasting 1000,2000,3000,and 4000 h show that the sensitivity and risk of SCC in the scratched area are decreased by grind-ing.Treatment using abrasive particles of a smaller size is more effective.Nevertheless,deep scratches remained hazardous even after the grinding.

关键词： Alloy 690TT Scratch Surface Stress corrosion high temperature corrosion Intergranular corrosion

Effects of cutting parameter on microstructure and corrosion behavior of 304 stainless steel in simulated primary water

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Journal of Materials Science & Technology 2022年第27期122卷 219-230页

作者： Honglin Yan Jianqiu Wang Zhiming Zhang Bright O.Okonkwo Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

The influence of surface conditions on the corrosion behavior of engineering structures has been paid more attention.However,there is still a lack of systematic research on the effect of cutting parameters on material’s microstructure and performance in service.In this paper,the effect of cutting parameters on microstructure and corrosion behaviors of 304 stainless steel in simulated primary water is well investigated.The results show that different cutting parameters can cause the superficial layer a gradient microstructure with nanocrystalized layer on top and deformation band structures underneath.With the similar surface roughness,the deformation microstructure can be very different due to the different cutting parameters.The effect degree on the depth of deformation zone is feed rate>cutting depth>cutting speed.The larger feed rate,lower cutting depth,lower cutting rate may induce a deeper deformation zone.With the increasing depth away from the machined surface,the localized corrosion rate is decreased,and at the same depth the localized corrosion rate along the deformation bands is higher than that along the grain boundaries(GBs).The nanocrystalized surface has a smallest general corrosion rate due to the quick formation of Cr rich oxide film.However,once the corrosion penetrates through this nanocrystalized layer,subsequent preferential corrosion at deformation bands and GBs will dominate and may lead to the significant increase of corrosion rate of the component in high temperature pressurized water.

关键词： Stainless steel Transmission electron microscopy(TEM) high temperature corrosion Cutting parameter

corrosion behavior of Ti60 alloy under continuous NaCl solution spraying at 600℃

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Journal of Materials Science & Technology 2022年第29期124卷 86-101页

作者： Rui Li Li Liu Yu Cui Rui Liu Lei Fan Min Cao Zhongfen Yu Zhiyong Chen Qingjiang Wang Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials CNPC Tubular Goods Research InstituteXi’an 710077China China ENFI Engineering Corp ENFI R&D Institute.Beijing 100038China

The corrosion behavior of Ti60 alloy was investigated under continuous NaCl solution spraying at 600℃.Results indicate that the corrosion rate of the Ti60 alloy is lower than that obtained with the solid NaCl deposit film in HO+O.The outer corrosion products are compact layers mainly containing NaTiOand nanocrystalline TiO.The inner layer is mainly composed of TiO,Ti O and SnO.TiO has a lamellar structure,and TiO has a strip-shaped structure.A mixed corrosion mechanism including classic oxidation and active oxidation occurred under NaCl solution spraying environment:the first stage was controlled by the classic oxidation mechanism with the promotion by the active oxidation following parabolic curves,and the second stage was controlled by the active oxidation mechanism following a linear rise in the mass gain curve.The mixed corrosion mechanism between classic oxidation and active oxidation produced a relatively dense Ti oxides scale,which decreased the corrosion rate.

关键词： Titanium alloy high temperature corrosion Continuous NaCl solution spraying

Evaluation of Ni-Fe base alloys as inert anode for low-temperature aluminium electrolysis

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Journal of Materials Science & Technology 2022年第12期107卷 216-226页

作者： Wei Wei Shujiang Geng Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityNo.3-11 Wenhua RoadShenyang 110819China

Isothermal oxidation behaviors of Ni–Fe(wt.%)and of the same alloy with additions of 10 and 15%Cr alloys in the air at 800℃and 900℃and their anodic behaviors in aluminum electrolysis system at 800℃were evaluated.The composition morphologies of oxide scales were characterized by XRD,SEM,and EDS.Results show that the scales formed on Ni–Fe alloy at both temperatures consisted of an inner(Ni,Fe)Olayer and an outer FeOlayer.For Ni–Fe–10Cr alloy,an external(Ni,Fe)O/FeOlayers and an internal oxidation zone were formed at 800°C,while a continuous CrOlayer forms at the internal oxidation zone/substrate interface at 900°C.A multilayer structure oxide of CrO/(Ni,Fe,Cr)O/(Ni,Fe)O/FeOwas formed on Ni–Fe–15Cr alloy at 800°C,while at 900℃the FeObecomes discontinuous disperses in the(Ni,Fe)Olayer close to the surface.Increases in oxidation temperature or Cr content for Ni–Fe–Cr alloys promote the growth of the inner CrOlayer and simultaneously reduce FeOcontent.After 4 h of electrolysis at an anode current density of 0.25 A cm,the oxidation resistance of Ni–Fe–15Cr anode is superior to the Ni–Fe anode.

关键词： Alloy Inert anodes Selective oxidation high temperature corrosion