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Electrochemical corrosion Behavior of Nanocrystalline Materials-a Review

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Journal of Materials Science & Technology 2010年第1期26卷 1-14页

作者： li liu, ying li and fuhui wang state key laboratory for corrosion and protection, institute of metal research, chinese academy of sciences, shenyang 110016, china [a] state key laboratory for corrosion and protection institute of metal research chinese academy of sciences shenyang 110016 china

Nanocrystallization significantly influences the electrochemical corrosion behaviors of metals/alloys in liquid system. In active dissolution, nanocrystallization accelerates the corrosion reactions. If the corrosion products are dissoluble, the corrosion rate is increased by nanocrystallization; if the corrosion products are insoluble, the corrosion rate is decreased on the contrary because the corrosion products act as a block layer to delay the dissolution. In passivation, nanocrystallization changes the composition of the passive film, and results into different morphology and growth process of the passive film, both of which improves the formation of compact film and influences the semiconductor property. It influences the passivation depending on fast element diffusion and special adsorbed ability. The small grain size improves the element diffusion, which leads to the different composition of passive film （passive elements enrichment such as Cr, Ti）. The small grain size also changes the surface condition, which influences the ions adsorption. All increase the corrosion resistance of materials. In local corrosion, nanocrystallization increases the unstable points on the surface of the materials, which increases the possibility of local corrosion. However, the excellent ability of element diffusion helps heal the local corrosion points, which inhibits the growth of the local corrosion.

关键词： Nanocrystalline materials Electrochemical corrosion Review

metals Supported Water Monomers:the Bonding Nature Revisited

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Journal of Materials Science & Technology 2010年第2期26卷 97-105页

作者： Jibiao li, Shenglong Zhu and fuhui wang state key laboratory for corrosion and protection, institute of metal research, chinese academy of sciences, shenyang 110015, china [a] state key laboratory for corrosion and protection institute of metal research chinese academy of sciences shenyang 110015 china

A single water monomer is known as a hard-to-observe molecule even in the presence of metal surfaces as supporting matrix. This review highlights effort in experimental characterizations and theoretical modeling of transition metals supported water monomers with attention given to its structure and bonding, together with the insights that we have provided into the bonding nature of the water-interactions by the newly employed projected PDOS （partial density of states） difference analysis, which is proved to be an effective tool to be elucidate such bonding nature. The general s-d hybridization and d-shell effect are summarized, and how these effects can be tuned by tailoring local surface configurations is discussed.

关键词： Water monomer Adsorption Surface bonding Transition metals

Investigation of the corrosion and Passive Behavior of HP-13Cr Stainless Steel in Formate Annulus protection Fluid

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Acta metallurgica Sinica(English Letters) 2024年第6期37卷 1087-1103页

作者： Jidong wang Tengfei Yin Wenlong Qi Xuanpeng li Yang Zhao Tao Zhang fuhui wang shenyang National laboratory for Materials Science Northeastern UniversityShenyang110819China state key laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials Tubular Goods Research InstituteCNPCXi’an710077China

The corrosion and passive behavior of HP-13Cr stainless steel(HP-13Cr SS)in formate annulus protection fluid was ***-13Cr SS exhibited good passive behavior in clean formate annulus protection fluid,which was attributed to a thinner and more dense passive film mainly composed of Cr_(2)O_(3).In the formation water solution,the passive film was composed of metastable Cr(OH)3,which was explained by the isoelectric point theory,resulting in the deterioration of the passive behavior of HP-13Cr *** the formation water penetrated the formate annulus protection fluid,a large number of loose FeCO_(3)particles formed in the corrosion scales,thus HP-13Cr SS suffered severe ***,avoiding formation water penetrating the formate annulus protection fluid is conducive to improving the service life of HP-13Cr SS oil tubes in extremely aggressive environment.

关键词： HP-13Cr SS Passive behavior Formate annulus protection fluid Isoelectric point

STOCHASTIC CRACKING AND HEAliNG BEHAVIORS OF THIN FILMS DURING REACTION-DIFFUSION GROWTH

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维普期刊数据库

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Acta metallurgica Sinica(English Letters) 2001年第6期14卷 544-548页

作者： S.L. Zhu, S.L. Yang, Y.M. Xiong, M.S. li, S.J. Geng, C.S. Hu, fuhui wang and W.T. Wu (state key Lab for corrosion and protection, institute of metal research, The chinese academy of sciences, shenyang 110016, china) state key Lab for corrosion and protection Institute of Metal Research The Chinese Academy of Sciences

The stochastic cracking and healing behaviors of reaction-diffusion growth of thin filmswere studied by means of Markov processes analysis. We chose the thermal growth ofoxide scales on metals as an example of reaction-diffusion growth. The thermal growthof oxide films follows power law when no cracking occurs. Our results showed that thegrowth kinetics under stochastic cracking and healing conditions was different fromthat without cracking. It might be altered to either pseudo-linear or pseudo-power lawsdependent upon the intensity and frequency of the cracking of the films. When thehoping items dominated, the growth followed pseudo-linear law; when the diffusionalitems dominated, it followed pseudo-power law with the exponentials lower than theintrinsical values. The numerical results were in good agreement with the meassuredkinetics of isothermal and cyclic oxidation of NiAl-0.1 Y (at. %) alloys in air at 1273K.

关键词： stochastic analysis reaction-diffusion growth oxide films

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高静水压力对水在环氧涂层中传输行为的影响

中国腐蚀与防护学报 2012年第3期32卷 203-209页

作者：刘樱刘莉李瑛王福会中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳110016

利用传统增重法和电化学阻抗测量技术研究了常压和深海高静水压力条件下水在环氧涂层中的传输行为。计算出了不同环境下水的扩散系数,并分析了静水压力对水在涂层中吸水动力学的影响。结果表明,高静水压力加速了水在涂层中的传输过程,... 详细信息

利用传统增重法和电化学阻抗测量技术研究了常压和深海高静水压力条件下水在环氧涂层中的传输行为。计算出了不同环境下水的扩散系数,并分析了静水压力对水在涂层中吸水动力学的影响。结果表明,高静水压力加速了水在涂层中的传输过程,使其扩散机制由常压下的理想Fick扩散行为变为S吸收型的非理想Fick扩散行为;扩散动力学参数,包括扩散速度、饱和时间和饱和吸水率均发生了明显变化;与涂层阻滞性能密切相关的涂层电容、涂层电阻和特征频率等参数随浸泡时间的变化在高压下也更为显著,涂层提前发生失效。

关键词：高静水压力环氧涂层传输电化学阻抗谱

Improvement on the corrosion Resistance of AZ91D Magnesium Alloy by Aluminum Diffusion Coating

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Journal of Materials Science & Technology 2007年第3期23卷 379-382页

作者： Hongwei HUO ying li fuhui wang College of life and Chemistry Science Shenyang Normal University Shenyang 110034 China state key laboratory of corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

By combination of magnetron sputtering deposition and vacuum annealing, an aluminum diffusion coating was prepared on the substrate of AZ91D alloy to improve its corrosion resistance. The microstructure and composition of the diffusion coating was investigated by scanning electron microscopy and X-ray diffraction. The diffusion coating was mainly comprised of β phase-Al12Mg17. The continuous immersion test in 3.5 wt pct neutral NaCl solution indicated that the specimen with diffusion coating had better corrosion resistance compared with the bare AZ91D alloy specimen. The potentiodynamic polarization measurement indicated that the diffusion coating could function as an effectively protective layer to reduce the corrosion rate of AZ91D alloy when exposed to 3.5 wt pct NaCl solution.

关键词： AZ91D Magnesium alloy corrosion Diffusion coating

Passivation of corrosion product layer on AM50 Mg by corrosion inhibitor

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Journal of Magnesium and Alloys 2022年第9期10卷 2563-2573页

作者： Yan li Xiaopeng lu Di Mei Tao Zhang fuhui wang shenyang National laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819China School of Materials Science and Engineering and Henan key laboratory of Advanced Magnesium Alloy Zhengzhou University100 Kexue RoadZhengzhou 450001China

The influence of sodium dodecyl sulfate(SDS)on morphology and chemical composition of corrosion product layer formed onα-Mg matrix and cathodic Al-Mn intermetallic was systematically investigated by using FIB and TEM analysis for the first time to disclose the underlying inhibition mechanism.A porous corrosion bi-layer composed of crystalline MgO and Mg(OH)_(2)was observed on both ofα-Mg and Al-Mn *** was found that a passive inner layer was deposited onα-Mg after immersion in SDS-containing NaCl solution,which can be ascribed to steady-state growth of magnesium and aluminum oxide under the protection of hydrophobic group of *** inhibition mechanism of the inhibitor was mainly associated with formation of dense oxide layer onα-Mg matrix and preferential adsorption of SDS on the corrosion layer deposited on Al-Mn intermetallic.

关键词： Magnesium TEM FIB Inhibition mechanism

Mysterious Waters at metal Surfaces

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Journal of Materials Science & Technology 2010年第9期26卷 769-775页

作者： Jibiao li Sheng longZhu fuhui wang state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China Department of Physics Stockholm University AlbaNova University Centre SE-106 91 Stockholm Sweden

Molecular structures of adsorbed waters at metal surfaces are essential to understanding the widespread processes ranging from ice nucleation,to water involved catalytic surface reactions,to many phenomena of biological and astrochemical *** of providing a comprehensive literature survey,we focus in this review on detailed structural information,such as water orientations and occupation sites,of intact waters at low temperatures and ultrahigh vacuum conditions investigated by various surface *** progresses made in direct imaging the surface waters at high resolutions,as exemplified in a close-packed（***（111）） and an open metal surfaces（***（110）） supported waters,structural mysteries remain at diverse metal *** highlight experimental challenges and discuss structural mysteries in elucidating surface water structures at molecular levels.

关键词： Water monolayer Surface structure Transition metal surfaces

A self-healing coating based on facile pH-responsive nanocontainers for corrosion protection of magnesium alloy

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Journal of Magnesium and Alloys 2022年第3期10卷 904-919页

作者： Yuejun Ouyang lin-Xin li Zhi-Hui Xie lili Tang fuhui wang Chuan-Jian Zhong Hunan Engineering laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000PR China Chemical Synthesis and Pollution Control key laboratory of Sichuan Province/institute of Synthesis and Application of Functional Materials College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002PR China shenyang National laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819PR China Department of Chemistry State University of New York at BinghamtonBinghamtonNY 13902USA

The preparation of pH-responsive nanocontainers by typical silane modification of the mesoporous silica nanoparticle(MSN)surface is usually high-cost,complex,and time-consuming,which remains a great challenge for effective corrosion protection of magnesium ***,a new strategy to construct pH-responsive nanocontainers(MSN-MBT@LDH)is *** nanocontainers consist of corrosion inhibitor(2-mercaptobenzothiazole,MBT)loaded MSN core and layered double hydroxide(LDH)nanosheet shell serving as *** successful loading of MBT and encapsulation by LDH nanosheets were confirmed by a series of characterization such as scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy(STEM-EDS)and N2 adsorption/desorption *** pH-responsive feature of the nanocontainers was demonstrated by determination of the MBT concentration in buffer solutions with different pH values.A smart corrosion protection system on Mg alloy is obtained by incorporating the synthesized nanocontainers into a self-assembled nanophase particle(SNAP)*** electrochemical tests and visual observations show that the hybrid coating has the best barrier properties and robustness in corrosion protection in NaCl corrosive solutions in comparison with the control *** present method simplifies the synthesis processes of nanocontainers and eliminates the potential detrimental effect of excess gatekeepers on the *** findings provide new insights into the preparation of scalable *** self-healing coatings are expected to have widespread applications for corrosion protection of Mg alloy and other metals.

关键词： Mg alloy Coating corrosion Layered double hydroxide Nanocontainer.