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Microstructure Characteristic and electrochemical corrosion behavior of Surface Nano-crystallization Modified Carbon Steel

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Journal of Iron and Steel Research International 2016年第12期23卷 1281-1289页

作者： Zhao-jun CHENG Dan SONG Jin-yang JIANG Jing-hua JIANG Xiao-long MA Kai YOU Ai-bin MA College of Mechanics and Materials Hohai UniversityNanjing 210098JiangsuChina School of Materials Science and Engineering Southeast UniversityNanjing 211100JiangsuChina Suqian Research Institute of Hohai University Suqian 223800JiangsuChina Department of Material Science and Engineering North Carolina State UniversityRaleigh 27606US

The surface nano-crystallization （SNC） of carbon steel was achieved via a high-speed rotating wire-brush- ing process. Microstructure characteristics of SNC steel were systematically studied. The SNC steel surface exhibited marked deformed plastic flows and high surface roughness. Due to the accumulated strains, a deformed gradient lay er with thickness of 40-50 μm was produced, and the grain size of the topmost zone was about 50-100 nm. X-ray photoelectron spectroscopy （XPS） analysis indicated that enhanced Fe oxides and Cr oxides were generated. electrochemical corrosion tests, including open circuit potential （OCP）, electrochemical impendence spectroscopy （EIS）, potentiodynamic polarization （PDP） and potentiostatic polarization （PP） were conducted to study the corrosion be- havior of SNC steel in 3.5 mass% NaC1 solution, where an improved corrosion resistance was observed. The resulted improvement resulted from the dominated positive effects （the attached Cr alloying element and enhanced oxide film） against the negative effects （the higher roughness and the improved corrosion activity of surface microstructure）.

关键词： surface nano-crystallization carbon steel microstructure electrochemical corrosion behavior

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Microstructure and electrochemical corrosion behavior of selective laser melted Ti−6Al−4V alloy in simulated artificial saliva

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Transactions of Nonferrous Metals Society of China 2021年第1期31卷 167-177页

作者： Jiang JU Jing-jing LI Min JIANG Meng-ya LI Li-xiang YANG Kai-ming WANG Chao YANG Mao-dong KANG Jun WANG Institute of Solidification Science and Technology School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong UniversityShanghai 200240China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Ti−6Al−4V alloy was fabricated via selective laser melting(SLM)to improve its corrosion resistance for *** microstructure and electrochemical corrosion behavior were investigated using scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),transmission electron microscopy(TEM),electrochemical test and contact angle *** can be found that the as-selective laser melted(as-SLMed)Ti−6Al−4V alloys showβcolumnar microstructure in building direction and nearly circular checkerboard microstructure in scanning direction,while the wrought and wrought+HT samples exhibit equiaxed *** as-SLMed Ti−6Al−4V alloy exhibits better corrosion resistance than the wrought and wrought+HT samples due to hydrophobicity,high grain boundary density and uniform distribution of alloying elements in simulated artificial saliva at 37℃.

关键词： Ti−6Al−4V alloy selective laser melting microstructure electrochemical corrosion behavior

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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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