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The corrosion characteristic and mechanism of Mg-5Y-1.5Nd-xZn-0.5Zr(x=0,2,4,6 wt.%)alloys in marine atmospheric environment

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Journal of Magnesium and Alloys 2024年第1期12卷 139-158页

作者： Quantong Jiang Dongzhu Lu Liren Cheng Nazhen Liu Baorong Hou CAS Key Laboratory of Marine Environmental corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesNo.7 Nanhai RoadQingdao 266071PR China State Key laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesNo.5625 Renmin StreetChangchun 130022PR China Open Studio for Marine corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)No.1 Wenhai RoadQingdao 266071PR China Sanya Institute of Oceanology South China Sea Institute of OceanologyChinese Academy of SciencesZhenzhou RoadSanya 572000PR China

The microstructure and precipitated phases of as-cast Mg-5Y-1.5Nd-x Zn-0.5Zr(x=0,2,4,6 wt.%)alloys were investigated by optical microscopy,scanning electron microscopy,energy-dispersive spectrometry and X-ray *** exposure corrosion experiment of these magnesium alloys was tested in South China Sea and KEXUE vessel atmospheric *** corrosion characteristic and mechanism of magnesium alloys of Mg-5Y-1.5Nd-x Zn-0.5Zr(x=0,2,4,6 wt.%)alloys were analyzed by weight loss rate,corrosion depth,corrosion products and corrosion *** electrochemical corrosion tests were also measured in the natural *** comprehensive results showed that Mg-5Y-1.5Nd-4Zn-0.5Zr magnesium alloy existed the best corrosion resistance whether in the marine atmospheric environment and natural seawater *** depended on the microstructure,type and distribution of precipitated phases in Mg-5Y-1.5Nd-4Zn-0.5Zr magnesium *** quantity anodic precipitated phases in the microstructure of Mg-5Y-1.5Nd-4Zn-0.5Zr alloy played the key role in the corrosion resistance.

关键词： Marine atmospheric environment Exposure corrosion Magnesium alloy corrosion rate corrosion mechanism

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corrosion mechanism of ceramic glaze from the Yangtze EstuaryⅡ

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Science China(Technological Sciences) 2023年第8期66卷 2246-2257页

作者： YU WenDi ZHAO Luo ZHAI Yang ZHAO Jing ZHANG KeXin GE Yan LI Qiang ZHAO Meng HUANG JiZhong LUO HongJie Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China Shanghai Cultural Heritage Conservation and Research Centre Shanghai 200031China Shanghai Museum Shanghai 200003China Institute for the Conservation of Cultural Heritage Shanghai UniversityShanghai 200444China

Ancient lead-glazed ceramics frequently corrode physically,chemically,and biologically when buried in soil,submerged in water,or exposed to *** comparison to the other two environments,relatively little research has been conducted on how leadglazed ceramics deteriorate in the water *** lead-glazed ceramic samples from the Yangtze EstuaryⅡwere examined for their micromorphology and structural composition using scanning electron microscopy-energy spectrum analysis,micro-area X-ray diffraction analysis,fluorescence microanalysis,and Fourier infrared spectroscopy *** results demonstrate the formation of deposits of PbCO_(3),Pb(OH)Cl,and Cu FeS_(2)and corrosion pits and fractures on the glaze layer *** to the corrosion phenomenon,the lead glaze layers of ceramics mainly underwent chemical and microbial corrosion in water,and the corrosion process of the lead glaze was expounded and *** research results deepen the understanding of the corrosion mechanism of lead-glazed ceramics,which is of great significance for the study of the conservation of lead-glazed ceramics and other types of ceramic relics and can also provide a reference for the long-term preservation of contemporary silicate products.

关键词： Yangtze Estuary II underwater ceramics lead glaze corrosion mechanism

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Superior corrosion resistance and corrosion mechanism of dual-main-phase (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M magnets in different solutions

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Journal of Rare Earths 2023年第1期41卷 122-129页

作者： Yaping Wu Minggang Zhu Qisong Sun Lele Zhang Peng Shen Yikun Fang Wei Li Division of Functional Materials Research Central Iron and Steel Research InstituteBeijing 100081China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

The electrochemical corrosion behavior of both (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnets prepared with dual-main-phase method and N45-type magnets was studied in 3.5 wt% NaCl,1.1 wt% NaH_(2)PO_(4),and 2.5 wt% NaOH solutions,*** (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnets perform superior corrosion resistance than N45-type magnets in the tested *** general,two kinds of magnets exhibit the best corrosion resistance property in 2.5 wt% NaOH solution,while the worst in 3.5 wt% NaCl *** of samples before and after corrosion were *** the addition of Ce by means of dual-main-phase method,which is conducive to facilitating low-temperature sintering and grain refinement,uniform grain size and(Nd,Ce)-rich phase distribution form,give rise to narrow and thin corrosion ***,the corrosion rate of the(Nd,Ce)-rich phase is lower than that of Nd-rich *** rdingly,corro sion re sistance of (Ce_(15)Nd_(85))_(30)Fe_(bal)B_(1)M sintered magnet is superior when compared with the commercial N45-type magnet which has comparable magnetic properties.

关键词： Sintered Nd-Fe-B magnet Electrochemical corrosion behavior Dual-main-phase method Electrolyte solution corrosion mechanism Rare earths

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corrosion mechanism of Alumina-magnesia Dry Materials for Smelting Manganese/chromium Steel in Coreless Medium Frequency Induction Furnaces

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China's Refractories 2023年第4期32卷 8-15页

作者： LIU Chenchen HUANG Ao NIE Jianhua GU Huazhi QIN Chuanjiang Lidah Mpoli NACHILIMA The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China

Alumina-magnesia dry materials are widely used in induction furnace linings, but they show different kinds of damage when melting different kinds of alloy steel. In this paper, the chemical composition, phase composition, and microstructure of the post-use dry materials for the working liners melting different kinds of steel were evaluated. Furthermore, the corrosion mechanism of the steel on the furnace lining materials was comprehensively analyzed. The findings reveal a significant ability of the Mn element in the molten steel to diffuse and penetrate into the refractories. Mn oxidizes to form MnO at the steel-refractory interface, and then forms a liquid phase with Al_(2)O_(3). The Cr element is dissolved into corundum and spinel of the refractories, resulting in lattice defects and structural damage of the materials. TiO2reacts with Al_(2)O_(3) to form Al_(2)TiO_(5), which plays a crucial role in preventing crack formation and propagation. Part of Ti4+dissolves into magnesia-alumina(MA), densifying the materials. TiO2also slows down the reaction between the Cr element and refractory components, further improving the corrosion resistance of the materials.

关键词： coreless medium frequency induction furnace manganese/chromium steel alumina-magnesia dry materials sintering layer corrosion mechanism

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Study of corrosion mechanism of dawsonite led by CO_(2)partial pressure

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Frontiers of Earth Science 2022年第2期16卷 465-482页

作者： Fulai LI Hao DIAO Wenkuan MA Maozhen WANG Shandong Provincial Key Laboratory of Deep Oil and Gas School of GeosciencesChina University of Petroleum(East China)Qingdao 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Bohai Oilfield Research Institute Tianjin Branch of CNOOC China LimitedTianjin 300452China

The stability of dawsonite is an important factor affecting the feasibility evaluation of CO_(2)geological *** this paper,a series of experiments on the interaction of CO_(2)-water-dawsonite-bearing sandstone were carried out under different CO_(2)*** the dissolution morphology and element composition of dawsonite after the experiment and the fluid evolution in equilibrium with dawsonite,the corrosion mechanism of dawsonite led by CO_(2)partial pressure was *** CO_(2)fugacity of the vapor phase in the system was calculated using the Peng-Robinson equation of state combined with the van der Waals 1-fluid mixing *** experimental results indicated that the thermodynamic stability of dawsonite increased with the increase of CO_(2)partial pressure and decreased with the increase of *** temperature at which dawsonite dissolution occurred was higher at higher f_(CO_(2)).There were two different ways to reduce dawsonite’s stability:the transformation of constituent elements and crystal structure *** undergoes component element transformation and crystal structure damage under different CO_(2)pressures with certain temperature *** on the comparison of the corrosion temperature of dawsonite,three corrosion evolution models of dawsonite under low,medium,and high CO_(2)pressures were *** conditions of medium and low CO_(2)pressure,as the temperature continued to increase and exceeded its stability limit,the dawsonite crystal structure was corroded *** the constituent elements of dawsonite dissolved,and the transformation of dawsonite to gibbsite *** high CO_(2)pressure,the constituent elements of dawsonite dissolved first with the increase of temperature,forming gibbsite,followed by the corrosion of crystalline structure.

关键词： dawsonite stability CO_(2)-water-rock interaction corrosion mechanism CO_(2)geological storage

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Effect of extrusion on corrosion behavior and corrosion mechanism of Mg-Y alloy

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Journal of Rare Earths 2016年第3期34卷 315-327页

作者：徐宏张新张奎石阳任霁萍 School of Materials Science and Engineering North University of China Institute of Thermal Power Generation Technology China Datang Coporation Science and Technology Research Institute State Key Lab for Fabrication & Processing of Non-ferrous Metals General Research Institute for Non-ferrous Metals Shenyang Area Military Representative Office of Armored Military Representative Office Chinese PLA General Armament Department

The influences of the hot extrusion process on the microstructure, corrosion behavior and corrosion mechanism for Mg-Y magnesium alloy were studied by means of the microstructure observation, weight loss test, electrochemical test and corrosion morphology test. The results showed that with increasing of the extrusion ratio, the shear flow line on the vertical section of the extruded alloy increased, the shear bands parallel lines became more clearly visible, and a large number of fine equiaxed grains distributed in parallel with the flow lines. The open circuit potential had a certain degree of improvement after extrusion, the open circuit potential increased with increment of extrusion ratio, and the corrosion potential of the vertical section was higher than that of the same alloy in the same compression ratio. The shift rate of the corrosion potential relatively became larger with increasing of the extrusion ratio, and the cathode corrosion current corresponding to the branch migration shifted to the positive direction. The high frequency capacitive arc increased with increment of the extrusion ratio, and the radius of capacitive arc of the vertical section was slightly larger than that of the transverse section. The corrosion morphologies of Mg-0.25 Y alloy were uniform corrosion, and the corrosion morphologies of Mg-（2.5, 5, 8 and 15） were the pitting corrosion and the small range, deep depth localized corrosion.

关键词： extrusion Mg-Y alloy corrosion behavior corrosion mechanism rare earths

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Initial corrosion behavior and mechanism of 7B04 aluminum alloy under acid immersion and salt spray environments

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Chinese Journal of Aeronautics 2022年第1期35卷 277-289页

作者： Yangguang ZHANG Yueliang CHEN Yong ZHANG Guixue BIAN Chenguang WANG Andong WANG Naval Aviation University Qingdao Campus Qingdao 266041China

The initial corrosion behavior and mechanism of 7B04 aluminum alloy under acid immersion and salt spray environments(pH=3.5)are studied by Scanning Electron Microscope(SEM),optical microscope,Fourier Transform Infrared Spectroscopy(FT-IR),X-Ray Diffraction(XRD),potentiodynamic polarization,Electrochemical Impedance Spectroscopy(EIS),and Scanning Kelvin Probe(SKP).The results show that pitting corrosion occurs at the initial corrosion stage,and the potential difference between the second phase particles is the main cause of *** pits on different locations gradually expand and coalesce with the proceeding of *** main components of corrosion products are Al_(2)O_(3),Al(OH)_(3),and AlCl_(3),and the generation rate of the corrosion product layer under the salt spray environment is larger than that under acid immersion *** both environments,the Volta potential distribution first disperses and then concentrates,while the charge transfer resistance first decreases and then increases with the corrosion *** Volta potential gradually shifts in a positive direction,indicating that corrosion products have an inhibitory effect on *** the same corrosion time,the corrosion product layer resistance and the expectation of the Volta potential of the salt spray sample are higher than those of the immersion ***,the corrosion current density for the salt spray sample is significantly lower than the immersion sample,which indicates that the thicker the corrosion product layer,the stronger the inhibition of corrosion reaction.

关键词： 7B04 aluminum alloy Acid salt spray corrosion mechanism corrosion products Electrochemistry Scanning Kelvin probe

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The corrosion characteristics and mechanism of directionally solidified Mg-3Zn-xCa alloys

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Journal of Magnesium and Alloys 2023年第10期11卷 3673-3687页

作者： Yi Zhang Xiaohui Feng Qiuyan Huang Yingju Li Xuehui Hao Changzheng Wang Yuansheng Yang Institute of Metal Research Chinese Academy of Scienceswenhua road 72Shenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China

An investigation into the corrosion characteristics and mechanism of directionally solidified(DSed) Mg-3Zn-xCa(x = 0, 0.2, 0.5,0.8 wt.%) alloys in 0.9 wt.% Na Cl solution is presented. The DSed microstructure consists of columnar dendrites and eutectics distributed in the interdendritic region. The primary dendritic arm spacing(PDAS) and the volume fraction(fv) of the secondary phases are under the significant impact of the content of Ca. The corrosion rates evaluated using electrochemical measurements and immersion tests are accelerated monotonously with the increase of Ca content in DSed alloys. The corrosion resistance of the DSed alloys is significantly affected by the corrosion products film(CPF) and the secondary phases. The corrosion products of DSed Mg-3Zn alloy contain Mg(OH)_(2) and ZnO. The existence of ZnO greatly enhances the corrosion resistance of DSed Mg-3Zn alloy. As for the DSed alloys containing Ca content, a relatively protective CPF without deep pits can form on the surface of DSed Mg-3Zn-0.2Ca specimen during the corrosion. The f_(v)of the secondary phases dominates the corrosion rate of the DSed Mg-Zn-Ca alloys. The corrosion of DSed Mg-3Zn-xCa alloys initiates as a result of microgalvanic coupling between the cathodes of secondary phases and α-Mg matrix anode. Then, the corrosion gradually extends longitudinally with the breakdown of CPF.

关键词： Mg-Zn-Ca alloy Directional solidification Electrochemical characterization corrosion mechanism

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corrosion mechanism OF SnO2-BASED INERT ANODES

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Transactions of Nonferrous Metals Society of China 1992年第4期2卷 8-13,20页

作者： Wang Huazhang Yang Jianhong Liu Yexiang Thonstad J. Central South University of Technology Changsha 410083China Norwegian Institute of Technology TrondheimNorway

According to the extent of their damage in cryolite melts,the corrosion of SnO_(2)-based inert anodes can be divided into three types,slight corrosion,m&rked corrosion and catastrophic *** conditions under which these three types take place and their mechanisms are *** work shows that depletion of oxygen containing ions in melts,high density,electrolyte penetration into the electrode and intergranular corrosion contribute greatly to marked corrosion and catastrophic corrosion and that the reduction reaction by aluminium only attacks the electrode slightly.

关键词： SnOy-based inert anodes corrosion corrosion mechanism aluminium eletrolysis

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corrosion mechanism of MgO-CaO Brick for AOD Furnace

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China's Refractories 2006年第3期15卷 13-16页

作者： WANG Jiandong GE Changchun SHEN Weiping School of Material Science and Engineering USTB Beijing 100083 China Yingkou Qinghua Refractory Material Limited

Residual MgO-CaO brick after being used in AOD furnace was determined by OM, SEM and EDAX. corrosion mechanism of MgO-CaO brick as furnace lining was studied. Results show that： The corrosion of MgO- CaO brick is mainly attributed to the solution and infiltration of silicate liquid phase. Transverse cracks between reacted zone and original zone are parallel to the working face, which is an important factor for deteriorating the corrosion of MgO-CaO bricks.

关键词： Refining furnace Magnesia-Calcia brick Microstructure corrosion mechanism

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