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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

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

pitting corrosion of Cu-Zn-Al Shape Memory Alloy in Simulated Uterine Fluid

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Journal of Materials Science & Technology 2005年第2期21卷 226-230页

作者： BangyiCHEN ChenghaoLIANG DaojunFU SchoolofChemicalEngineering DalianUniversityofTechnologyDalian116012China SchoolofChemicalEngineering DalianUniversityofTechnologyDalian116012China//StateKeyLaboratoryforCorrosionandProtectionShenyang110016China

Electrochemical test technology and surface analysis method were employed to investigate the pitting corrosion of Cu-Zn-AI shape memory alloy in simulated uterine fluid. The results showed that the breakage of the breaking-renovating equilibrium of surface layers resulted in the pitting corrosion of Cu-Zn-AI shape memory alloy in simulated uterine fluid. The development of pitting corrosion was controlled by dissolution of surface layers. The critical pitting corrosion potential was 1.70 VSCE. The kinetics equation for the development of pitting corrosion for Cu-Zn-AI shape memory alloy in simulated uterine fluid was io=465.68 t-0.5+1.5. pitting appearances of pits could be two types: tortoise-shell, and anomaly abscess. Cl- ion facilitated the pitting corrosion of Cu-Zn-AI shape memory alloy by competing adsorption and concentrating on alloy surface at high positive potential.

关键词： Cu-Zn-Al Shape memory alloy Simulated uterine fluid pitting corrosion

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 *** 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 *** 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 *** 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 *** 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 *** 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

pitting corrosion and crevice corrosion behaviors of high nitrogen austenitic stainless steels

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 517-524页

作者： Hua-bing Li Zhou-hua Jiang Yan Yang Yang Cao Zu-rui Zhang School of Materials and Metallurgy Northeastern University Shenyang 110004 China

pitting corrosion and crevice corrosion behaviors of high nitrogen austenitic stainless steels （HNSS） were investigated by electrochemical and immersion testing methods in chloride solution, respectively. The chemical constitution and composition in the depth of passive films formed on HNSS were analyzed by X-ray photoelectron spectrum （XPS）. HNSS has excellent pitting and crevice corrosion resistance compared to 316L stainless steel. With increasing the nitrogen content in steels, pitting potentials and critical pitting temperature （CPT） increase, and the maximum, average pit depths and average weight loss decrease. The CPT of HNSS is correlated with the alloying element content through the measure of alloying for resistance to corrosion （MARC）. The MARC can be expressed as an equation of CPT=2.55MARC-29. XPS results show that HNSS exhibiting excellent corrosion resistance is attributed to the enrichment of nitrogen on the surface of passive films, which forms ammonium ions increasing the local pH value and facilitating repassivation, and the synergistic effects of molybdenum and nitrogen.

关键词： high nitrogen austenitic stainless steel pitting corrosion crevice corrosion nitrogen critical pitting temperature syner-gistic effect

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 *** 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 *** 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 *** 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 *** 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 *** the RE inclusions completely dissolve,the open corrosion pits with shallow depth are formed in *** 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

pitting corrosion of Al2024-T3 in sodium chloride solution

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中国有色金属学会会刊：英文版 2001年第5期11卷 748-752页

作者：张昭张鉴清王建明邵海波曹楚南 Zhejiang Univ Dept Chem Hangzhou 310027 Peoples R China State Key Lab Corros & Protect Shenyang 110015 Peoples R China

pitting corrosion behavior of Al2024 T3 in sodium chloride solution was investigated by using potentiodynamic scanning (PDS) measurements and electrochemical impedance spectroscopy (EIS) technique. When pitting corrosion of the alloy occurs, there exists a passive region in the anodic branch of PDS polarization curve, which is enlarged with the increasing of immersion time due to the competition of the halide ions with OH - ions to adsorb on the oxide film to form the corrosion products film and the increase of pitting corrosion area. Two capacitive semicircles were observed in complex plane plot. For more extensive pitting and general corrosion of Al2024 T3, the passive region in PDS disappeared, while another depressed semicircle was observed in Nyquist plot because of the formation of corrosion products film. On the other hand, the low frequency inductive loop, which had often been regarded as a manifestation of pitting or formation and precipitation of a salt film, was not observed, which indicates that the low frequency inductive loop can not be the characteristic of pitting corrosion or the formation of salt film. The results also show that higher reactant CPE exponent values will correspond to more extensive transformation of a metal surface by very localized corrosion, while general corrosion can result in a smaller CPE exponent value.

关键词： Al2024 T3 pitting corrosion electrochemical impedance spectroscopy potentiodynamic scanning

pitting corrosion of 316L Stainless Steel under Low Stress below Yield Strength

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Journal of Wuhan University of Technology(Materials Science) 2012年第2期27卷 238-241页

作者：吕胜杰程学群 LI Xiaogang Center of corrosion&Protection Science and Technology University BeijingBeijing 100083China Shijiazhuang Refine and Chemical Company Limited SINOPEC 050032China

pitting corrosion of 316L stainless steel （316L S S） under various stress was studied by potentiodynamic polarization, electrochemical impedance spectroscopy （EIS） and Mott-Schottky （M-S） analysis in 3.5% NaC1 solution. The results of polarization curves show that, with the increase of the stress, the pitting potentials and the passive current density markedly decrease firstly （180 MPa）, and then increase greatly （200 MPa）. The corresponding surface morphologies of the samples after the polarization test well correspond to the results. Mott-Schottky analysis proved the least C1- adsorbed to the surface of passive film with more positive flat potential, indicating that a moderate stress could increase the pitting corrosion resistance of 316L SS in 3.5% NaC1 solution.

关键词： stress stainless steel pitting corrosion

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 *** work revealed the inhibitory effect of nitrogen on pitting corrosion of HEAs caused by sul-fate reducing bacterium Desulfovibrio *** indicated that HEA-0 N was susceptible to pitting corrosion and sulfidation under attack of ***,whereas the addition of nitrogen significantly de-creased the 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 *** 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