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Lifetime prediction and failure analysis of organic coatings by EIS

中国有色金属学会会刊：英文版 2004年第z1期14卷 455-458页

作者： YAN Rui WU Hang MA Shi-ning XU Bin-shi surface engineering research institute of cmes Chinese Mechanical Engineering Society Beijing 100072 China Surface Engineering Research Institute of CMES Chinese Mechanical Engineering Society Beijing 100072 China Surface Engineering Research Institute of CMES Chinese Mechanical Engineering Society Beijing 100072 China Surface Engineering Research Institute of CMES Chinese Mechanical Engineering Society Beijing 100072 China

Organic coatings are widely used to control the corrosion of steel structure. The anticorrosive property of these coatings depends on their barrier properties, making a separation between the corrosive medium and the substrate. But unavoidable completely small pores, cracks and other defects in organic coatings may cause ions, water, gases, and other corrosive species penetrate and distribute in the coatings, causing accumulation and swelling of coatings, so leading to the degradation of coatings. In addition, water affects the permeation of oxygen and other corrosive medium, consequently the presence of such substances at coating-metal interface promotes corrosion of metal substrate. So the absorbability of the coatings to water may be one of the most important factors in undercoating corrosion. In recent years, electrochemical impedance spectroscopy (EIS) has been established and frequently used as a non-destructive testing method for assessing the performance of organic coatings, especially for the determination of the water content in organic coatings, since the capacitance of the coatings is sensitive to the penetration of water. So from EIS it can extract a wealth of information on the electrochemical corrosion of coated steels, especially, it can be utilized to assess organic coatings used under particular surroundings. The principle, methods and application of EIS on evaluating life-span and analyzing failure mechanism of organic coatings are also introduced briefly. Combining other analysis techniques such as XRD, SEM and FTIR with electrochemical technique, it will blaze a way in studying degradation mechanism of organic coatings and estimating their lifetime.

关键词： organic coatings lifetime prediction failure analysis electrochemical impedance spectro scopy

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Study on microstructure and properties of high velocity arc sprayed Fe_3Al intermetallic coating

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China Welding 2002年第1期11卷 1-4页

作者：朱子新徐滨士马世宁杜则裕 School of Material Science & engineering Tianjin University Tianjin 300072 surface engineering research institute of cmes Beijing 100072

Coating structural materials with Fe 3Al based intermetallics may rapidly lead to industrial application of their environment and wear resistant features. In the present study, high velocity arc spraying (HVAS) was used to in situ synthesize Fe 3Al intermetallic coating. The microstructural characterization and properties of the coating have been investigated. The microstructure was found to consist of Fe 3Al based intermetallic (D0 3 and B2) and α Fe regions together with fine oxide (α Al 2O 3) layers. TEM images of coating show that the solidified lamellae are polycrystalline and have a grain size of the order of about 150 nm , and there also exists amorphous state in some areas. It can be concluded that a very high cooling rate has been obtained during HVAS process. Moreover, the coating has relatively higher adhesion strength and microhardness, as well as lower density and porosity.

关键词： Fe 3Al intermetallics high velocity arc spraying coating microstructure property

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surface alloying of Cu with Ti by double glow discharge process

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中国有色金属学会会刊：英文版 2004年第3期14卷 516-519页

作者：袁庆龙池成忠苏永安徐重唐宾 surface engineering research institute

The surface of pure copper alloyed with Ti using double glow discharge process was investigated. The morphology, structure and forming mechanism of the Cu-Ti alloying layer were analyzed. The microhardness and wear resistance of the Cu-Ti alloying layer were measured, and compared with those of pure copper. The results indicate that the surface of copper activated by Ar and Ti ions bombardment is favorable to absorption and diffusion of Ti element. In current experimental temperature, as the Ti content increases, the liquid phase occurs between the deposited layer and diffused layer, which makes the Ti ions and atoms easy to dissolve and the thickness of Cu-Ti alloying layer increase rapidly. After cooling, the structure of the alloying layer is composed of CuTi, Cu4Ti and （Cu（Ti）） solid solution. The solid solution strengthening and precipitation strengthening effects of Ti result in high surface hardness and wear resistance.

关键词：表面合金化铜钛双辉放电 Cu-Ti合金

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Tribological Properties of a Dendrite-reinforced Ti-based Metallic Glass Matrix Composite under Different Conditions

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Journal of Iron and Steel research International 2016年第1期23卷 57-63页

作者： Teng ZHANG Xiao-min LIN Hui-jun YANG Yong LIU Yong-sheng WANG Jun-wei QIAO research institute of surface engineering Taiyuan University of Technology

The tribological properties of the in-situ dendrite-reinforced metallic glass matrix composite（Ti42Zr22V14-Cu5Be17）prepared by copper mould casting were analyzed at different normal loads under the dry condition and *** results showed that the average value of the frictional coefficients and micro-hardness ascended with increasing the normal load,while the wear rate showed a trend of decline under the dry *** electrochemical test results showed that the surface of samples was pitting corroded in the *** matrices were corroded *** the dendrites were exposed,leading to the damage of the *** the frictional coefficients and wear rate of the composite in the rainwater were larger than those under the dry condition,primarily owing to the corrosion of chloride ions on the worn *** wear mechanisms of composites were mainly adhesive wear,accompanied by the abrasive wear under the dry condition and corrosive wear in the *** composites have higher wear resistance both under the dry condition and rainwater due to the lower wear rate.

关键词： sliding wear surface topography electrochemical test pitting corrosion

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Phase Transformation and Enhancing Electron Field Emission Properties in Microcrystalline Diamond Films Induced by Cu Ion Implantation and Rapid Annealing

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Chinese Physics Letters 2016年第8期33卷 123-126页

作者：申艳艳张一新祁婷乔瑜贾钰欣黑鸿君贺志勇于盛旺 research institute of surface engineering Taiyuan University of Technology

Cu ion implantation and subsequent rapid annealing at 500℃ in N2 result in low surface resistivity of 1.611 ohm/sq with high mobility of 290 cm2 V-1S-1 for microcrystalline diamond （MCD） films. Its electrical field emission behavior can be turned on at Eo = 2.6 V/μm, attaining a current density of 19.5μA/cm2 at an applied field of 3.5 V/#m. Field emission scanning electron microscopy combined with Raman and x-ray photoelectron mi- croscopy reveal that the formation of Cu nanoparticles in MCD films can catalytically convert the less conducting disorder/a-C phases into graphitic phases and can provoke the formation of nanographite in the films, forming conduction channels for electron transportation.

关键词： Cu of MCD Phase Transformation and Enhancing Electron Field Emission Properties in Microcrystalline Diamond Films Induced by Cu Ion Implantation and Rapid Annealing in by

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Tribological and Impact Fatigue Behaviors of Pure Titanium Treated by Plasma Ni Alloying

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Journal of Wuhan University of Technology(Materials Science) 2012年第3期27卷 427-431页

作者：贺志勇 research institute of surface engineering Taiyuan University of Technology

Ni modified layer is prepared on the surface of pure titanium by plasma surface alloying technique. surface appearance, micro-structure morphology, composition distribution, phase structure and microhardness of Ni modified layer are analyzed. Tribological performance and fatigue behaviors of Ni modified layer of pure titanium are observed using Pin-on-disc tribometer and repeated impact test. The results indicate that the surface mean Ni concentration of Ni modified layer is nearly 18% which is composed of TiNi, Ti2Ni and Ti phase. The maximum surface microhardness of Ni modified layer is approximately 580 HV which is almost two-fold of the hardness of the substrate. The wear resistance of Ni modified layer is improved obviously. The wear mechanism of Ni modified layer shows slight abrasion wearing, while pure titanium is abrasion and adhesion wearing. Ni modified layer presents better impact fatigue strength.

关键词： TA2 Ni modified layer wear impact test

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Preparation and Characterization of Plasma Cu surface Modified Stainless Steel

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Journal of Wuhan University of Technology(Materials Science) 2012年第2期27卷 260-264页

作者：张翔宇唐宾 research institute of surface engineering Taiyuan University of Technology

Cu modified layer was prepared on the surface of AISI304 stainless steel by plasma surface alloying technique. The effects of processing parameters on the thickness, surface topography, microstructure and chemical composition of Cu modified layer were characterized using glow discharge optical emission spectroscopy （GDOES）, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The experimental results show that the surface modified layer is a duplex layer （deposited ＋ diffused layer） with thickness of about 26 ktm under the optimum process parameters. The modified layer is mainly composed of a mixture of Cu and expanded austenite phase. The ball-on-disk results show that the modified layer possesses low friction coefficients （0.25） and excellent wear resistance （wear volume 0.005 x 109 um3）. The Cu modified layer is very effective in killing the bacteria S. aureus. Meanwhile, no viable S. aureus is found after 3 h （100% killed） by contact with the Cu alloyed surface.

关键词： Cu modified layer stainless steel wear and friction antibacterial properties

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Fracture Behavior of CrN Coatings Under Indentation and Dynamic Cycle Impact

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Journal of Wuhan University of Technology(Materials Science) 2012年第3期27卷 411-414页

作者：田林海唐宾 research institute of surface engineering Taiyuan University of Technology

Fracture behavior of CrN coatings deposited on the surface of silicon and AISI52100 steel by different energy ion beam assisted magnetron sputtering technique （IBAMS） was studied using indentation and dynamic cycle impact. It is found that, for the coatings on silicon substrate, the cracks form in the indentation corners and then propagate outward under Vickers indentation. The coating prepared using ion assisted energy of 800 eV shows the highest fracture resistance due to its compact structure. Under Rockwell indentation, only finer radial cracks are found in the CrN coating on AISI 52100 steel without ion assisting while in the condition of ion assisting energy of 800 eV, radial, lateral cracks and spalling appear in the vicinity of indentation. The fracture of CrN coatings under dynamic cycle impact is similar to fatigue. The impact fracture resistance of CrN coatings increases with the increase of ion assisting energy.

关键词： CrN coatings IBAMS fracture behaviors indentation dynamic cycle impact

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Corrosion Resistance of Molybdenum Nitride Modified Ti6Al4V Alloy in HCl Solution

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Journal of Wuhan University of Technology(Materials Science) 2008年第3期23卷 358-361页

作者：范爱兰唐宾 research institute of surface engineering Taiyuan University of Technology

The Mo-N surface modified layer on Ti6Al4V alloy was obtained by the plasma surface alloying technique. The structure and composition of the Mo-N modified Ti6Al4V alloy were investigated by X-ray diffraction （XRD） and glow discharge optical emission spectroscopy （GDOES）. The Mo-N modified layer contains Mo-N coating on subsurface and diffusion layers between the subsurface and substrate. The X- ray diffraction analysis of the Mo-N modified Ti6Al4V alloy reveals that the outmost surface of the Mo-N modified Ti6Al4V alloy is composed of phase Mo2N （fcc） and Mo2N （tetr）. The electrochemical corrosion performance of the Mo-N modified Ti6Al4V alloy in 0.5 mol/L HCl solution was investigated and compared with that of Ti6Al4V alloy. The chemical corrosion performance of the Mo-N modified Ti6Al4V alloy in boiling 37% HCl solution was investigated and compared with that of Ti6Al4V alloy. Results indicate that self-corroding electric potentials and corrosion-rate of the Mo-N modified Ti6Al4V alloy are higher than that of Ti6Al4V alloy in 0.5 mol/L HCl solution. The corrosion-rate of the Mo-N modified Ti6Al4V alloy is lower than that of Ti6Al4V alloy in boiling 37% HCl solution.

关键词： Ti6Al4V Mo-N modified Ti6Al4V alloy corrosion performance

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Effects of C,N-Codoped on the Corrosion Resistance of TiO_2 Films Prepared by Plasma surface Alloying and Thermal Oxidation Duplex Process

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Journal of Wuhan University of Technology(Materials Science) 2011年第3期26卷 495-498页

作者：王鹤峰唐宾 research institute of surface engineering Taiyuan University of Technology

C,N-codoped TiO 2 films have been deposited onto stainless steel substrates using plasma surface alloying and thermal oxidation duplex *** analysis shows that the films shield the substrates *** TiO 2 films are anatase in structure as characterized by X-ray *** electrochemical measurements show that the equilibrium corrosion potential positively shifts from-0.275 eV for bare stainless steel to-0.267 eV for C,N-codoped TiO 2 coated stainless steel,and the corrosion current density decreases from 1.3×10-5 A/cm2 to 4.1×10-6 A/*** corrosion resistance obtained by electrochemistry noise also reveals that the C,N-codoped TiO 2 films provide good protection for stainless steel against corrosion in stimulated body *** above results indicate that C,N-codoped TiO 2 films deposited by plasma surface alloying and thermal oxidation duplex process are effective in protecting stainless steel from corrosion.

关键词： plasma surface alloying titanium dioxide C N-codoped corrosion stainless steel electrochemistry noise

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