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Numerical Analysis of Cold-Formed Thin-Walled Steel Short Columns with pitting corrosion during Bridge Construction

Structural Durability & Health Monitoring 2024年第2期18卷 181-196页

作者： Hongzhang Wang Jing Guo Shanjun Yang Chaoheng Cheng Jing Chen Zhihao Chen CCCC Second Harbor Engineering Third Engineering Co. Ltd.Zhenjiang212000China Suqian Highway Development Center Suqian223800China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou221116China

pitting corrosion is harmful during bridge construction,which will lead to uneven roughness of steel surfaces and reduce the thickness of steel.Hence,the effect of pitting corrosion on the mechanical properties of cold-formed thin-walled steel stub columns is studied,and the empirical formulas are established through regression fitting to predict the ultimate load of web and flange under pitting corrosion.In detail,the failure modes and load-displacement curves of specimens with different locations,area ratios,and depths are obtained through a large number of non-linear finite element analysis.As for the specimens with pitting corrosion on the web,all the specimens are subject to local buckling failure,and the failure mode will not change with pitting corrosion,but the failure location will change with pitting corrosion location;the size,location,and area ratio of pitting corrosion have little influence on the ultimate load of cold-formed thin-walled steel short columns,but the loss rate of pitting corrosion section area has a greater impact on the ultimate bearing capacity.As for the specimen with flange pitting corrosion,the location and area ratio of pitting corrosion have less influence on the ultimate load of cold-formed thin-walled steel short columns,and the section area loss rate has greater influence on the ultimate bearing capacity;the impact of web pitting corrosion on the ultimate load is greater than that of flange pitting corrosion under the same condition of pitting corrosion section area.The prediction formulas of limit load which are suitable for pitting corrosion of web and flange are established,which can provide a reference for performance evaluation of corroded cold-formed thin-walled steel.

关键词： pitting corrosion cold-formed thin-walled steel ultimate load prediction formula short columns

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pitting corrosion behavior of Cu-P-RE weathering steels

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Journal of Rare Earths 2023年第2期41卷 321-330页

作者： Lijie Yue Yeshu Meng Jinsheng Han Kun Xie Yipin Sun Yunliang Tan School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China

The weathering steels are prone to pitting corrosion in an environment containing chloride ions.The pitting behavior of Cu-P-RE weathering steels and its effect on the corrosion resistance of steels were investigated by multifarious analytical techniques,such as field emission-scanning electron microscopy(FE-SEM),electron probe microanalysis(EPMA),scanning Kelvin probe force microscopy(SKPFM),electrochemical workstation and a series of immersion tests.The results show that the original stripshaped MnS inclusions and Al_(2)O_(3)inclusions with sharp angles are modified into the fine spherical rare earth(RE)inclusions with small average size,which are mainly RE oxysulfides after adding appropriate amount of mischmetal(48.9 wt%Ce-42 wt%La-5 wt%Nd-Fe)into the Cu-P weathering steel.In the environment containing Cl^(-),the pitting corrosion in RE weathering steel is induced by the preferential dissolution of RE inclusions in that the RE inclusions have a more negative potential than steel matrix at the initial corrosion stage.With the increase of corrosion time,the driving force of pitting expansion is weakened as a re sult of the continuous dissolution of RE inclusions,which makes the pitting tend to propagate horizontally around the RE inclusions.Once the RE inclusions completely dissolve,the open corrosion pits with shallow depth are formed in steel.The dispersed pitting pits with small size and shallow depth induced by RE inclusions are conducive to the formation of uniform and dense corrosion products layer on the steel surface,which reveals that the addition of RE can improve the corrosion resistance of weathering steels.

关键词： Inclusion pitting corrosion Weathering steel Rare earths corrosion resistance

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Enhanced pitting corrosion resistance of CoCrFeMnNi high entropy alloy in the presence of Desulfovibrio vulgaris via nitrogen doping

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Journal of Materials Science & Technology 2023年第8期139卷 92-102页

作者： Chuntian Yang Hao Feng Xiaobo Chen Yu Han Huabing Li Dake Xu Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang110819China School of Engineering RMIT UniversityCarltonVIC 3053Australia School of Metallurgy Northeastern UniversityShenyang110819China

corrosion-resistant high nitrogen high entropy alloys(HEAs)were manufactured by pressurized metal-lurgy.This work revealed the inhibitory effect of nitrogen on pitting corrosion of HEAs caused by sul-fate reducing bacterium Desulfovibrio vulgaris.Results indicated that HEA-0 N was susceptible to pitting corrosion and sulfidation under attack of D.vulgaris,whereas the addition of nitrogen significantly de-creased the pitting sensitivity.pitting potentials of HEA-0.52 N and HEA-1.23 N increased by 133%and 171%,respectively compared to HEA-0 N in the presence of SRB.X-ray photoelectron spectroscopy results unveiled that nitrogen enriched in passive film and strengthened it by increasing fraction of Cr_(2)O_(3)and Fe^(3+)_(ox).Surface of the nitrogen-alloyed HEAs exhibited less defective passive films as revealed by Mott-Schottky results.Nitrogen doping provides a novel insight into the design of microbial corrosion resistant HEA.

关键词： High entropy alloy Microbiologically influenced corrosion Sulfate reducing bacteria Nitrogen doping pitting corrosion

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Origin mechanism of pitting corrosion induced by cerium inclusions

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稀土学报:英文版 2023年第9期41卷 1448-1458,I0007页

作者： Xiangjun Liu Changqiao Yang Huiping Ren Yiming Li Zili Jin Fang Zhang Jichun Yang School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resource Inner Mongolia University of Science and TechnologyBaotou 014010China

In this paper,the origin mechanism of pitting corrosion induced by Ce_(2)O_(3),Ce_(2)O_(2)S,and CeAlO_(3) inclusions in a microalloyed steel was investigated by field emission scanning electron microscopy with energy dispersive spectroscopy and electron backscattered diffraction,conductivity atomic force microscopy,immersion test,and first-principles calculation.The results show that the Ce_(2)O_(3),Ce_(2)O_(2)S,and CeAlO_(3) inclusions are non-conductive,which are impossible to form corrosion couples with the steel matrix.There are no obvious lattice distortion zones in the steel matrix around the Ce_(2)O_(3),Ce_(2)O_(2)S,and CeAlO_(3) inclusions,so it is difficult to form micro-galvanic corrosion near the Ce inclusion.The order of work functions of the Ce inclusions and the steel matrix from small to large is Ce_(2)O_(2)Spitting corrosion of Ce-containing microalloyed steel.

关键词： Microalloyed steel Rare earth inclusion Conductivity atomic force microscopy First-principles calculation pitting corrosion

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New insights into the hardening and pitting corrosion mechanisms of thermally aged duplex stainless steel at 475℃:A comparative study between 2205 and 2101 steels

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Journal of Materials Science & Technology 2022年第3期98卷 123-135页

作者： R.Silva G.S.Vacchi C.L.Kugelmeier I.G.R.Santos A.A.Mendes Filho D.C.C.Magalhães C.R.M.Afonso V.L.Sordi C.A.D.Rovere Munir Rachid corrosion Laboratory Department of Materials EngineeringFederal University of São CarlosRodovia Washington Luis Km 23513565-905 São CarlosSPBrazil Engineering Modeling and Applied Social Sciences Center(CECS)Federal University of ABCAvenida dos Estados 500109210580 Santo AndréSPBrazil Federal University of São Carlos Graduate Program in Materials Science and EngineeringBrazil

In this study,the relationship between spinodal decomposition and the formation of Ni-rich clusters and G-phase in the ferrite on hardening and pitting corrosion of two thermally aged duplex stainless steels(DSSs)at 475℃was investigated.Results indicate that,for 2205 DSS,pitting corrosion behavior is influenced by the presence and size of G-phase precipitates for longer aging times,but this contribution is masked by the advanced stage of spinodal decomposition in the ferritic structure.On the other hand,for 2101 DSS,the formation of Cr-richer nitrides impairs pitting corrosion resistance more than spinodal decomposition.

关键词： Duplex stainless steel Spinodal decomposition G-phase precipitation pitting corrosion Hardening

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Dry passivation of austenitic SUS 301L stainless steel against pitting corrosion in marine atmospheric environment

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Journal of Oceanology and Limnology 2022年第4期40卷 1437-1447页

作者： Yonghong LU Xiao LIU Lisha WANG Jinghong YANG Haibo XU Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China 2 CRRC Changchun Railway Vehicles Co.Ltd.Changchun 130062China

Being an exclusive construction material for lightweight rail vehicles,protection from pitting corrosion in harsh marine atmospheric environment in high humidity and Cl-ion concentration is critical for austenitic SUS 301L stainless steel(SS),especially when it inevitably suff ers from mechanical damages during post disposals.Herein,an innovative dry passivation method for austenitic SUS 301L SS was established in a closed air atmosphere at low temperature and constant pressure.The process parameters were optimized,and the passivation mechanism was explained using polarization curve,electrochemical impedance spectroscopy(EIS),X-ray photoelectron spectroscopy(XPS),and contact angle measurement.The pitting corrosion susceptibility of the passive fi lm prepared in a closed air chamber under 1.0×10^(5) Pa at 80℃ for 80 min was evaluated in 3.5%NaCl solution and exhibited higher pitting potential and corrosion resistance,lower passivity-maintaining current density,and wettability when compared with conventional nitric acid treatment.Besides,dry passivation facilitated the repairing of the surface structural defect itself and the post-processing damage,similar to the accelerated aging of fi lm.The decrease in oxygen concentration and convection-diff usion strengthened the preferential chromium oxidation to form a compact chromium-rich passive fi lm to resist the aggression of Cl-ion.

关键词： austenitic stainless steel passive film dry passivation pitting corrosion chloride ion

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corrosion of Duplex Stainless Steel Manufactured by Laser Powder Bed Fusion: A Critical Review

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 587-606页

作者： Yiqi Zhou Decheng Kong Ruixue Li Xing He Chaofang Dong Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

Laser powder bed fusion (LPBF) is a commonly used additive manufacturing (AM) method for efficiently producing intricate geometric components. This investigation examines factors such as pores, cellular structure, grain size, and inclusions from the manufacturing process that contribute to the corrosion resistance of LPBF DSS. Furthermore, the as-built LPBF duplex stainless steel (DSS) is primarily ferrite due to the rapid cooling process. Therefore, the transformation of ferrite to austenite after various heat treatments in LPBF DSS and its corresponding corrosion resistance are presented. Additionally, a new mixed powder method is proposed to increase the austenite content in the as-built LPBF DSS. This review also focuses on the passivation capability and pitting corrosion performance in LPBF and conventional DSS. This article summarizes the variations in microstructure between as-built and heat-treated LPBF DSS, with their impacts on corrosion resistance, offering insights for manufacturing highly corrosion-resistant LPBF DSS.

关键词： Laser powder bed fusion Duplex stainless steel Microstructure Heat treatment Passivation pitting corrosion

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pitting corrosion of a Rare Earth Mg alloy GW93

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Journal of Materials Science & Technology 2017年第9期33卷 954-960页

作者： Yingwei Song Dayong Shan En-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences

pitting corrosion of magnesium(Mg) alloys is greatly associated with their microstructure, especially second phases. The second phases in traditional Mg alloys such as AZ91 are electrochemically nobler than Mg matrix, while the second phases in Rare earth(RE) Mg alloy GW93 are more active than Mg matrix. As a result, the pitting corrosion mechanism of Mg alloy GW93 is different from the traditional ones. This paper aims to clarify the pitting corrosion mechanism of Mg alloy GW93 through the studies of Volta potential by Scanning Kelvin Probe Force Microscopy(SKPFM), corrosion morphology by Scanning Electron Microscope(SEM), and corrosion resistance by electrochemical tests. Results reveal that the pitting corrosion of GW93 includes three stages, first, dissolution of the second phases, followed by corrosion of Mg matrix adjacent to the dissolved second phases, and finally, propagation of corrosion pits along the depth direction of the dissolved second phases. Anodic second phases and enrichment of Clin the thick corrosion product films dominate the propagation of pitting corrosion.

关键词： Mg alloys pitting corrosion Second phases Oxide films

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pitting corrosion of 2Cr13 stainless steel in deep-sea environment

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Journal of Materials Science & Technology 2021年第5期64卷 187-194页

作者： Xinhua Wang Lin Fan Kangkang Ding Likun Xu Weimin Guo Jian Hou Tigang Duan State Key Laboratory for Marine corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266237China

pitting corrosion of 2Cr13 stainless steel was investigated by deep-sea exposure test at various depths of 500 m,800 m and 1200 m in the South China Sea for 4 months.With the aid of electrochemical measurements in simulated deep-sea environments and grey relational analysis,the influence of deepsea environments on passive film and the mechanism of pitting corrosion were discussed.The results indicated that with the increase of sea depth,pitting depth of 2Cr13 stainless steel increased,which can be attributed to the change of chemical composition and the degradation of pitting resistance of passive film.Film growth was greatly retarded in the condition of low seawater temperature and low dissolved oxygen content of deep sea,resulting in an unstable and vulnerable film.pitting depth was most influenced by hydrostatic pressure,which can increase the adsorption and penetration of Cl-ion,and promote the proliferation of point defects in passive film,leading to rapid deconstruction of protective oxides of the film.pitting sensitivity of 2Cr13 stainless steel increased eventually with the combination of accelerated dissolution and suppressed self-healing of passive film in deep sea.

关键词： Stainless steel Deep sea pitting corrosion Passive film Grey relational analysis

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pitting corrosion of 13Cr Steel in Oxygen-free Completion Fluids of Organic Salt

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Acta Metallurgica Sinica(English Letters) 2013年第3期26卷 271-276页

作者： Lining XU Yao MENG Yunguang SHI Yan LIU Key Laboratory for Environmental Fracture (MOE) Institute of Advanced Materials and Technology University of Science and Technology Beijing

corrosion behavior of 13Cr steel in oxygen-free completion fluids of the organic salt at 180℃ was studied. Cross-sectional morphologies of the corrosion products were observed by scanning electron microscopy. Energy dispersive spectrum （EDS） was used to study the element distribution of the corrosion product inside and outside the pits. The results show that the organic salt causes severe pitting corrosion of 13Cr steel. The width and depth of the pits increase simultaneously when the test duration prolongs, and potassium enriches inside the pits.

关键词： 13Cr steel pitting corrosion Organic salt Completion fluids

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