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Corrosion Behavior and Mechanism of Irradiated 304 Nuclear Grade Stainless Steel in High-Temperature Water

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Acta Metallurgica Sinica(English Letters) 2021年第2期34卷 174-186页

作者： Ping Deng En-Hou Han Qunjia Peng Chen Sun CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Nuclear power institute of China Chengdu 610213China Suzhou Nuclear power research institute Suzhou 215004China state power investment corporation research institute Beijing 102209China

Corrosion behavior and mechanism of irradiated 304 nuclear grade stainless steel were studied in simulated pressurized water reactor primary *** microstructure of the oxide formed on the steel irradiated to different doses over an exposure period range of 25–1500 h was analyzed and *** was found that the general and intergranular corrosion rates of the steel were increased with irradiation dose,in correspondence with an evolution of the general oxide and the oxide formed at the grain *** of the oxide evolution with the corrosion kinetics and mechanism has been discussed in detail.

关键词： Stainless steel Irradiation High-temperature corrosion Intergranular corrosion

Proton irradiation assisted localized corrosion and stress corrosion cracking in 304 nuclear grade stainless steel in simulated primary PWR water

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Journal of Materials Science & Technology 2021年第6期65卷 61-71页

作者： Ping Deng Qunjia Peng En-Hou Han Wei Ke Chen Sun CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences.Shenyang 110016China Nuclear power institute of China Chengdu 610213China Suzhou Nuclear power research institute Suzhou 215004China state power investment corporation research institute Beijing 102209China

Localized deformation and corrosion in irradiated 304 nuclear grade stainless steel in simulated primary water were *** investigation was conducted by comparing the deformation structure,the oxide scale formed at the deformation structure,and their correlation with *** results revealed that increasing the irradiation dose promoted localized corrosion at the slip step and grain boundary,which was primarily attributed to the strain concentration induced by enhanced localized deformation and depletion of Cr at grain ***,a synergic effect of the enhanced localized deformation and localized corrosion at the slip step and grain boundary caused a higher cracking susceptibility of the irradiated steel.

关键词： Stainless steel AFM TEM High temperature corrosion Stress corrosion

Influencing factors and mechanism of iodine-induced stress corrosion cracking of zirconium alloy cladding:A review

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 586-598页

作者： Yusha Li Changchun Ge Yanhong Liu Guangbin Li Xiaoxu Dong Zongxing Gu Yingchun Zhang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China state power investment corporation Science and Technology research institute Beijing 100029China

Failure of the zirconium alloy claddings due to iodine-induced stress corrosion cracking(I-SCC)will increase the risk of fission product *** progress of I-SCC has been comprehensively investigated in a massive amount of published *** a comprehensive understanding of I-SCC,this review focuses on summarizing the mechanisms and influencing factors of *** show that micropits are formed on the surface of zirconium alloys due to the reaction between iodine and zirconium,and then small pits gradually gather to form pit *** are easily generated in pit clusters and propagate along the grain *** reaching a particular condition,the crack will transform into transgranular direction *** the crack develops,it finally becomes a ductile *** also summarize various factors that may affect *** specific cracking conditions are linked to elements,such as iodine concentration,temperature,microstructure,and alloying ***,the improvement of the I-SCC resistance of zirconium alloys needs to be further *** attention can be paid to material properties,such as alloying elements,microstructure,and surface treatment,to improve the I-SCC resistance of zirconium alloys.

关键词： iodine-induced stress corrosion cracking zirconium fracture

Influence of Nano-Al Concentrates on the Corrosion Resistance of Epoxy Coatings

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Journal of Materials Science & Technology 2013年第4期29卷 353-358页

作者： Yongchun Liang Fu-Chun Liu Ming Nie Shuyan Zhao Jiedong Lin En-Hou Han The Electric power research institute of Guangdong power Grid corporation state Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences

A two-stage process was used to produce nano-composite epoxy coatings. The first step involved preparing nano-AI concentrates with high concentration and low viscosity, and the second step produced nano- composite epoxy coatings by mixing the nano-AI concentrates and epoxy resin. Later, the coating was examined with immersion and salt spray tests. The coatings were characterized by electrochemical impedance spectroscopy （EIS）, scanning electron microscopy （SEM） and X-ray photoelectron spectroscopy （XPS）. The results showed that the 5% nano-AI significantly improves the corrosion resistance of the coatings. There are two effects of nano-AI on the coating. Nano-AI is corroded initially to protect the substrate from corrosion, and then the aluminum oxide and aluminum hydroxide were produced after corrosion of nano-AI, which hindered the transmission of corrosion fluid into the coatings.

关键词： Nanometer metal Organic coatings Salt spray test Electrochemical impedance spectroscopy

Waterborne Epoxy Nanocoatings Modified by Nanoemulsions and Nanoparticles

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Journal of Materials Science & Technology 2014年第10期30卷 1036-1042页

作者： Zhenyu Wang Enhou Han Fuchun Liu Zhouhai Qian Liwei Zhu state Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences Electric power research institute of Zhejiang Electric power corporation

Electrically conductive coatings are required for static charge dissipation in power ground network. In the present investigation electrically conductive nanocoatings were prepared by the incorporation of graphite, nano-SiO2 concentrate, acrylic nanoemulsion and fluorocarbon emulsion onto the waterborne epoxy polymer. The nanosize distribution of nano-SiO2 concentrate and nanoemulsion was characterized with laser diffraction analyzer and scanning electron microscopy （SEM）. From the results of SEM image, the graphite particles were well distributed in conductive coating. The corrosion resistance and thermal stability of nanocoatings were comparatively studied by SEM and thermogravimetry （TG）. The corrosion-inhibiting properties of the conductive nanocoatings were investigated by salt immersion test. The measurements of contact angle, bonding strength and heat-freeze charge demonstrated that 1.5-2.0 wt% nanoparticles improve the resistance to pollution, adherence and resistance to heat-freeze charge of conductive nanocoatings. The measured results of surface electric resistance of nanocoatings demonstrated that a small amount of nano- SiO2 particles could enhance the conductivity in the corrosive environment.

关键词： Waterborne conductive nanoeoatings Corrosion resistance Conductive properties Graphite filler Ground network

Preparation of Zr-Cu Coatings on Copper Substrate Using a Molten Salt Method

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 1155-1160页

作者： LI Yusha ZHANG Yingchun LIU Yanhong LI Guangbin DONG Xiaoxun l.School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China state power investment corporation Science and Technology research institute Beijing 100029China

Dense zirconium coatings on copper substrates were obtained in an alumina crucible and a stainless steel crucible from FLiNaK-K_(2)ZrF_(6)molten salt at 1023 *** to the potential difierences between copper and zirconium,zirconium can difiuse into the copper substrate to form zirconium alloys on the surface of copper substrates in the course of *** coating deposited in a stainless steel crucible has a gray *** components of the coating are mainly CuZr2alloy and Cu_(10)Zr_(7)alloy,and,the outermost layer of the coating is a layer of amorphous pure *** coating deposited in an alumina crucible has a silvery white metallic *** components of the coating are mainly Cu-Zr-Al intermetallic compounds,AlCu_(2)Zr,ZrAl,AlCu and ***,two types of zirconium coatings can greatly increase the hardness of the substrate.

关键词： coating Zr-Cu molten salt intermetallic compounds

Architecture,Key Technologies and Applications of Load Dispatching in China power Grid

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Journal of Modern power Systems and Clean Energy 2022年第2期10卷 316-327页

作者： Yu Dong Xin Shan Yaqin Yan Xiwu Leng Yi Wang state Grid corporation of China Beijing 100031China NARI Group corporation(state Grid Electric power research institute) Nanjing 211000China

With the development of renewable energy and the changes in the characteristics of power grid,it is becoming increasingly difficult to balance power supply and demand in space and *** addition,the requirement for improved dispatching capability of power grid is ***,the potential of flexible load dispatching should be realized,which can promote the large-scale consumption of renewable energy and the construction of new power *** on the analysis of existing load dispatching studies and the differences in the characteristics of domestic and foreign load dispatchings,a technical architecture and several key technologies are proposed for load resources to participate in power grid dispatching under the new situation,i.e.,the autonomous collaborative control system of load *** system implements the multi-layer coordinated control of main,distribution and micro grids(load aggregators).Adjustable load resources are aggregated through an aggregator operation platform and connected with a dispatcher load regulator platform to realize real-time data interaction with dispatching agencies as well as the monitoring,con-trol,and marketing of *** supports the load resources to participate in network-wide dispatching optimization via continuous power *** key technologies such as the control mode,load modeling,dispatching strategy,and safety protection are also *** the closed-loop control of orderly charging piles and energy storage clusters in the North China power Grid,the feasibility of the proposed architecture and key technologies is *** route has successively supported multiple adjustable load aggregators to partici-pate in the ancillary services market of North China power Grid for ***,the technical challenges of load resources participating in power grid dispatching under the dual carbon goals are discussed and prospected.

关键词： Automatic power control(APC) load modeling load dispatching renewable energy accommodation situation awareness.

Hygrothermal ageing performance of high temperature vulcanised silicone rubber and its degradation mechanism

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High Voltage 2023年第6期8卷 1196-1205页

作者： Yu Deng Bo Peng Zheyuan Liu Yujun Du Songsong Zhou Jinghua Liu Xinzhe Yu Jun Zhou state Key Laboratory of power Grid Environmental Protection(China Electric power research institute) BeijingChina state Grid corporation of China BeijingChina

High temperature vulcanised silicone rubber(SR)has excellent hydrophobicity and thus is widely applied both in indoor and outdoor *** to the analysis of different experimental ageing tests and field investigation of SR,temperature and humidity are considered to be the fundamental factors during *** ageing was proposed in this study to simulate the chalking state of the SR,finally leading to the irreversible degradation far below the thermal decomposition *** variation of morphology,hardness and polydimethylsiloxane(PDMS)content was quantified during the yearlong hygrothermal ageing *** is implied that the gradual process of whitening and hardening are accompanied by the decline of the PDMS ***,ageing delamination in SR and its degradation mechanism were proposed.

关键词： thermal mechanism rubber

Kinetics Characteristics and Bremsstrahlung of Argon DC Discharge Under Atmospheric Pressure

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Plasma Science and Technology 2013年第4期15卷 335-342页

作者：何为刘兴华咸日常陈素红廖瑞金杨帆肖汉光 state Key Laboratory of power Transmission Equipment & System Security and New Technology Chongqing University Zibo power Supply Company Shandong Electric Power Corporation Shandong Electric power research institute Shandong Electric Power Corporation

An improved self-consistent, multi-component, and one-dimensional plasma model for simulating atmospheric pressure argon glow discharge is presented. In the model, both the plasma hydrodynamics model and chemical model are considered. The numerical simulation is carried out for parallel-plate geometry with a separation of 0.06 cm. The results show that Ar＊ plays a major role in the discharge, which is mainly produced by ground state excitation reaction. The electron temperature reaches its maximum in the cathode sheath but maintains a low value （0.23 eV） in bulk plasma. Elastic collision is the dominant volumetric electron energy loss in atmosphere argon glow discharge, which is negligible in low pressure argon glow discharge. The metastable step-wise ionization is the main mechanism for electron production to sustain the discharge. However, the highest contribution to electron production rate is ground state ionization reaction. The bremsstrahlung power density is related to electric voltage. With the increase of the electric voltage, the bremsstrahlung power density increases, namely, the strength of ultraviolet radiation spectrum enhances in the cathode sheath.

关键词： atmospheric pressure glow discharge plasma model metastable argon atom,ionization reaction bremsstrahlung power density