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Corrosion Fatigue Behavior of Duplex Stainless Steel in 3.5% sodium chloride solution

Journal of University of Science and Technology Beijing 2001年第2期8卷 133-136页

作者： S. H Abubakir, Yinshun Wu, Baofeng Ding, Jiuqing Li Bei Cao (Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) Material Sci. and Engineering School University of Science and Technology Beijing 100083 China

The corrosion fatigue behavior of duplex stainless steel (DSS) was studied at different cyclic stress levels in 3.5%NaCl (mass fraction, so as the follows) solution (pH=7) at 50 degreesC. The results showed that DSS was susceptible to pitting corrosion and corrosion fatigue. Both intergranluar corrosion cracking and transgranlular corrosion cracking initiated at the bottom of pitting holes. Furthermore, the corrosion fatigue properties of DSS in 3.5%NaCl solution may be relatived to complex electrochemical and mechanical coupling effects between the three phases (austenite, ferrite and martensite), where martensite and ferrite were anodic in the corrosion cell and could be prone to cracking under certain condition.

关键词： corrosion fatigue duplex stainless steel sodium chloride solution

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The Effect of Pore solution on the Hysteretic Curve of Expansive Soil under Cyclic Loading

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Fluid Dynamics & Materials Processing 2023年第7期19卷 1963-1981页

作者： Xinshan Zhuang Wu Wen Rong Zhou Gaoliang Tao Wentao Li Hubei Provincial Ecological Road Engineering Technology Research Center Hubei University of TechnologyWuhan430068China

A dynamic triaxial instrument was used to study the effects of different concentrations of sodium chloride and stress amplitudes on the dynamic properties of an expansive soil under cyclic loading.In particular,four parameters were considered in such a parametric investigation,namely,hysteresis curve morphology characteristic non-closure degreeεp,the ratio of the short and long axisα,the slope of the long axis k and the enclosed area S.The results show that with an increase in the sodium chloride concentration,the soil particle double electric layer becomes thinner,the distance between soil particles decreases,and the whole sample becomes denser.Theεp-N,α-N and S–N relation curves all show a decreasing trend.The ratio of plastic deformation to total deformation grows with increasing the dynamic stress amplitude,and the curves show an upwards trend.The k-N relationship curve displays an increasing trend with the concentration and a general downwards trend as the dynamic stress amplitude is made higher.This also indicates that sodium chloride solutions can improve the engineering properties of expansive soil to a certain extent.With an increase in the vibration times N,the shape of the hysteretic curve becomes narrower,and the whole soil exhibits a cyclic strain hardening.With the help of an exponential function,a model is introduced to predict the relationship between the concentration and the hysteretic curve.

关键词： Expansive soil cyclic loading sodium chloride solution hysteretic curve diffuse double-layer

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Corrosion Resistance of Sintered NdFeB Permanent Magnet With Ni-P/TiO_2 Composite Film

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Journal of Iron and Steel Research(International) 2009年第3期16卷 89-94页

作者： SONG Lai-zhou YANG Zhi-yong Department of Environment and Chemical Engineering Yanshan University Qinhuangdao 066004 HebeiChina Central Iron and Steel Research Institute Beijing 100081 China

The Ni-P/TiO2 composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction （XRD）,environmental scanning electron microscopy （ESEM）,and energy dispersive X-ray spectrometer （EDX）. The corrosion resistance of Ni-P/TiO2 film coated on NdFeB magnet,in 0.5 mol/L NaCl solution,was studied by potentiodynamic polarization,salt spray test and electrochemical impedance spectroscopy （EIS） techniques. The self-corrosion current density （icorr） and the polarization resistance （Rp） of Ni-P/TiO2 film are 0.22 μA/cm2 （about 14% of that of Ni-P coating）,and 120 kΩ·cm2 （about 2 times of that of Ni-P coating）,respectively. The anti-salt spray time of Ni-P/TiO2 film is about 2.5 times of that of the Ni-P coating. The results indicate that Ni-P/TiO2 film has a better corrosion resistance than Ni-P coating,and the composite film increases the corrosion resistance of NdFeB magnet markedly.

关键词： sintered NdFeB permanent magnet Ni-P/TiO2 composite film sodium chloride solution corrosion resistance

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高渗氯化钠溶液复苏对失血性休克小肠黏膜细胞HO-1 mRNA表达及凋亡的影响(英文)

高渗氯化钠溶液复苏对失血性休克小肠黏膜细胞HO-1 mRNA表达及凋...

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第七届全国创伤学术会议暨2009海峡两岸创伤医学论坛

作者：陆远强黄卫东蔡秀军浙江大学医学院附属第一医院急诊科浙江大学医学院邵逸夫医院普外科

Objective:To investigate the early effects of hypertonic and isotonic saline solutions on Heme oxygenase-1(HO-1) mRNA expression and apoptosis of intestinal mucosa in rats with hemorrhagic shock. Methods:A model of rat with severe hemorrhagic shock was established in 21 Sprague-Dawley(SD) rats. The rats were randomly divided into the sham group,normal saline resuscitation(NS) group,and hypertonic saline resuscitation(HTS) group,with 7 in each group.We detected and compared the HO-1 mRNA expression and apoptosis in small intestinal mucosa of rats after hemorrhagic shock and resuscitation by SYBR Green I fluorescence quantitative reverse transcriptase polymerase chain reaction,FITC(fluorescein -iso-thiocyanate)-Annexin V/PI(propidium iodide) double staining method,and flow cytometry. Results:In the early stage of hemorrhagic shock and resuscitation,marked apoptosis of small intestinal mucosa in the rats of both NS and HTS groups was observed.The apoptotic rate of small intestinal mucosa in the NS group was significantly higher than that in the HTS group(P<0.01).Among the three groups,HO-1 mRNA of mall intestinal mucosa in the HTS group had the highest level of expression;however,the differences were not statistically significant(P=0.612).There was a significant negative correlation between HO-1 mRNA expression and apoptosis of small intestinal mucosa in the rats of NS and HTS groups after hemorrhagic shock and resuscitation.Conclusion:In this rat model of severe hemorrhagic shock,the HTS resuscitation of small volume is more effective than the NS resuscitation in reducing apoptosis of intestinal mucosa.Meanwhile,HO-1 mRNA over-expression of intestinal mucosa may be one of the molecular mechanisms of HTS in the resuscitation of hemorrhagic shock.

关键词： Hemorrhagic shock Resuscitation sodium chloride solution Hypertonic saline Apoptosis Heme oxygenase-1 mRNA Intestinal mucosa Flow cytometry Reverse transcriptase polymerase chain reaction

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高渗氯化钠溶液复苏对失血性休克小肠黏膜细胞HO-1mRNA表达及凋亡的影响(英文)

高渗氯化钠溶液复苏对失血性休克小肠黏膜细胞HO-1mRNA表达及凋亡...

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2009年浙江省急诊医学学术年会

作者： Department of Emergency the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou(310003 ) China Department of General Surgery Sir Run Run Shaw Hospital School of Medicine Zhejiang University Hangzhou Yuan-qiang LU Wei-dong HUANG Xiu-jun CAI

Objective To investigate the early effects of hypertonic and isotonic saline solutions on Heme oxygenase-1 (HO-1) mRNA expression and apoptosis of intestinal mucosa in rats with hemorrhagic shock。

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The Study on the Corrosion Behaviour of Welded and Unwelded Medium Carbon Steel in sodium chloride(Nacl)solutions

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Journal of Metallic Material Research 2020年第2期3卷 1-16页

作者： Cyril Ocheri Hebert A.Obiorah Romanus Egwuonwu Njoku Nnaemeka Anthony Urama Joseph Babalola Agboola Christopher Nwankwo Mbah Johnson NwaemezieEzeanyanwu Chikezie Walter Onyia Department of Metallurgical and Materials Engineering University of NigeriaNsukka Department of Metallurgical and Materials Engineering Federal University of TechnologyMinnaNiger State Department of Metallurgical and Materials Engineering Enugu State University of Science and TechnologyEnugu

The research work was based on the study of the corrosion behaviour of the welded and un-welded medium carbon steel in sodium chloride solutions.The sodium chloride solutions used are 1ml,2ml,3ml and 4ml for both welded and un-welded medium carbon steel in NaCl.The experiments were conducted in two ways,the weight loss analyses of measurements and using the electrochemical analyzer workstation to determine the potential dynamic of the samples.The samples for the weight loss measurements were prepared from rolled products obtained at the foundry shop.Two medium carbon steel materials were sourced with different chemical compositions as sample A and B.The materials were prepared to accommodate the experiments for the determination of welded and un-welded medium carbon steel.A total of sixty-eight(68)samples were produced,prepared and used for the weight loss measurements/analyses the experiments.Thirty-four of the samples each were prepared for both the welded and un-welded experiments.All the samples were produced and prepared through the use of various machining processes with the use of a lathe machine for planning,milling.Thirty-four(34)of the sample preparation were further welded in readiness of the experiments.Sixty-eight breakers were sourced for and used.Ten(10)other samples were used for the determination with the use of the electrochemical analyzer.The chemical compositions of the medium carbon steel were determined with the use of SPECTRO Analytical Instruments.A metallurgical inverted optical microscope was used to determine the microstructures of the materials.The Scanning Electron Microscopy with EDS was used to determine the morphologies of the materials.The thirty-four of the samples were welded this process was performed to determine the effects of welding on the material surrounding the weldments.These materials were made into sizes with the use of power hacksaw(i.e.2cm by 2cm).Other materials were prepared to 1cm x 1cm thickness from the same materials.The Tafel plot experiments and that of the

关键词： Corrosion behaviour Welded Un-welded Medium carbon steel sodium chloride solution

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