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Ni-P-SiC composite coatings electroplated on carbon steel assisted by mechanical attrition

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Acta Metallurgica Sinica(English Letters) 2010年第2期23卷 137-146页

作者： Zhaoxia PING Guoan CheNG yedong he Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing Beijing 100083 China

Ni-P-SiC composite coatings were electroplated on carbon steel substrate assisted by mechanical attrition （MA）. The MA action was conducted by dispersing glass balls on the cathodic surface, vibrating in the horizontal direction. The experimental results show that, under the assistant of MA action, the adhesion of Ni-P-SiC coating on the steel substrate can be improved effectively, and the Ni-P-SiC coatings exhibit a crystallized structure and Ni-P matrix can combine tightly with SiC particles, and the hardness and corrosion resistance of these coatings increase markedly. During heat treatment, the defects produced in conventional Ni-P-SiC composite coatings can be avoided assisted by MA action. Both of the wear of these coatings can be improved further.

关键词： Ni-P-SiC composite coating attrition resistance and corrosion resistance Electroplating Mechanical

Mechanically Assisted Electroless Barrel-plating Ni-P Coatings Deposited on Carbon Steel

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Journal of Materials Science & Technology 2010年第10期26卷 945-950页

作者： Zhaoxia Ping Cuoan Cheng yedong he Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing Beijing 100083 China

A mechanically assisted electroless （MAE） barrel-plating technique has been developed to deposit Ni-P coatings on carbon *** mechanical treatment was carried out in a rolling drum containing carbon steel specimens and glass balls of 2-3 mm diameter,which was submerged in a bath containing electroless plating *** coatings are Ni-polycrystalline and have a fine grained structure and smooth *** hardness and corrosion resistance of the novel coatings are considerably improved compared with the conventional electroless （CE）-plated Ni-P coatings,which are *** heat treatment at 400 C for one hour,cracks and pores are observed in the CE-plated Ni-P coating,while no cracks appear in the MAE barrel-plated Ni-P *** improved properties of the MAE barrel-plated Ni-P coatings demonstrate the advantages of this novel technique,wide applications of which will be found in industries.

关键词： Mechanically assisted electroless barrel-plating Ni-P coating Crystallization Corrosion resistance Microhardness

Mechanical assisted electroless barrel-plating Ni-P coatings on magnesium alloy

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Acta Metallurgica Sinica(English Letters) 2009年第3期22卷 225-232页

作者： Zhaoxia PING Juntao YUAN yedong he Xiaogang LI Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing Beijing 100083 China

A mechanically assisted electroless barrel-plating Ni-P was carried out in a rolling drum containing Mg alloy specimens and ceramic balls, which was submerged in a bath containing electroless plating solution deposited by this novel technique have a It is demonstrated that the Ni-P coatings crystallized Ni-P solid solution structure, showing fine-grains, higher hardness, and higher corrosion resistance compared with the conventional electroless plated amorphous Ni-P coatings. After heat treatment at 400 ℃ for 1 h, the structure of such Ni-P coatings were transformed to a structure with Ni-Ni3P double phases, and cracks in these coatings could not be observed, whereas cracks appeared seriously in the conventional electroless plated Ni-P coating after same heat treatment. Therefore, both hardness and corrosion resistance of these Ni-P coatings can be improved further by heat treatment. All of these beneficial effects can be attributed to the role of mechanical attrition during the mechanically assisted electroless barrel-plating process.

关键词： Mechanically assisted electroless barrel-plating Ni-P coating Crystallization Corrosion resistance Microharduess

Surface Microstructure and High Temperature Oxidation Resistance of Thermal Sprayed NiCoCrAlY Bond-Coat Modified by Cathode Plasma Electrolysis

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Journal of Materials Science & Technology 2017年第9期33卷 1055-1060页

作者： Shunjie Deng Peng Wang yedong he Jin Zhang Beijing Key Laboratory for Corrosion Erosion and Surface TechnologyUniversity of Science and Technology Beijing

The surface properties of the air-plasma sprayed bond-coat have been modified by cathode plasma electrolysis（CPE）. After modification, a re-melted layer without obvious pores and oxide stringers is formed,the gain size of re-melted layer is approximately 80–120 nm. It is shown, from cyclic oxidation at 1100℃,that a thin oxide scale mainly composed of α-Al;O;has been formed on the modified bond-coat and the oxidation resistance of the modified bond-coat has been significantly improved. Such beneficial result can be attributed to following effects: during CPE process, the plasma discharges with high temperature take place on the bond-coat surface. With plasma discharge treatment, the surface is melted and quickly re-solidified, the grain size decreases, and the pores and oxide stringers disappear. During cyclic oxidation, owing to the above modification of surface properties, the critical content of Al for selective oxidation is significantly decreased. Therefore, a continuous Al;O;scale is formed.

关键词： Cathode plasma electrolysis NiCoCrAlY bond-coat Surface modification Microstructure High-temperature oxidation

Influence of clay concentration on the morphology and properties of clay-epoxy nanocomposites prepared by in-situ polymerization under ultrasonication

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Journal of University of Science and Technology Beijing 2008年第3期15卷 320-323页

作者： Jinwei Wang Xianghua Kong Lei Cheng yedong he Beijing Key Laboratory for Corrosion Erosion and Surface Technology School of Materials Science and Engineering University of Science and TechnologyBeijing Beijing 100083 China

To investigate the effect of clay concentration on the structures and properties of bisphenol-A epoxy/nanoclay composites, three composites with organoclay concentrations of 2.5wt%, 5wt%, and 7.5wt% of the epoxy resin were prepared by in-situ polymerization under mechanical stirring followed by ultrasonic treatment. The clay aggregates on micro-scale indicate the absence of fully exfoliated nanocomposites. The layer space decreases with the increase of clay concentration, which suggests that the exfoliation would be constrained if more clay is added as the ultrasonic force is exerted. The thermal decomposition temperature remains almost unchanged with the increase of clay concentration. The glass transition temperature of the composites decreases slightly with the increase of clay concentration, whereas the storage modulus increases with the increase of clay concentration.

关键词： nanocomposite thermal properties mechanical properties clay concentration ultrasonication

EVOLUTION OF SULFIDE SCALES ON Fe-Mo ALLOYS DURING SULFIDATION

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中国有色金属学会会刊：英文版 1997年第3期7卷 61-65页

作者： Liu, Haiping Qi, Huibin he, yedong Zhu, Rizhang Univ of Science & Technology Beijing Beijing China

ＥＶＯＬＵＴＩＯＮＯＦＳＵＬＦＩＤＥＳＣＡＬＥＳＯＮＦｅＭｏＡＬＬＯＹＳＤＵＲＩＮＧＳＵＬＦＩＤＡＴＩＯＮ①ＬｉｕＨａｉｐｉｎｇ，ＱｉＨｕｉｂｉｎ，ＨｅＹｅｄｏｎｇ，ＺｈｕＲｉｚｈａｎｇＯｐｅｎＬａｂｏｒａｔｏｒｙ... 详细信息

ＥＶＯＬＵＴＩＯＮＯＦＳＵＬＦＩＤＥＳＣＡＬＥＳＯＮＦｅＭｏＡＬＬＯＹＳＤＵＲＩＮＧＳＵＬＦＩＤＡＴＩＯＮ①ＬｉｕＨａｉｐｉｎｇ，ＱｉＨｕｉｂｉｎ，ＨｅＹｅｄｏｎｇ，ＺｈｕＲｉｚｈａｎｇＯｐｅｎＬａｂｏｒａｔｏｒｙｆｏｒＣｏｒｒｏｓｉｏｎａｎｄＥｒ...

关键词： Fe Mo alloy sulfidation microstructure

Al diffusion coating on Mg alloy by a surface nanocrystallization enhanced CVD process

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International Journal of Smart and Nano Materials 2010年第4期1卷 288-293页

作者： Weiwei Chen yedong he Wei Gao Beijing Key Lab for Corrosion Erosion and Surface TechnologyThe University of Science and Technology BeijingBeijing 100083China Department of Chemical and Materials Engineering The University of AucklandPB 92019Auckland 1142New Zealand

Surface nanocrystallization by mechanical attrition was used to enhance the chemical vapor deposition *** aluminum(Al)diffusion coating was produced on AZ91 Mg alloy *** process was conducted at a relatively low temperature(400◦C)for a short time of 120 *** results indicated that a continuous and dense Mg17Al12 intermetallic coating with a thickness of∼8µm formed on the Mg alloy *** no corrosion was observed after the coated samples were immersed in 3 wt%NaCl solution for 6 h,reflecting a relatively good corrosion *** formation mechanism of the Al diffusion coating is discussed based on the experimental results.

关键词： mechanical attrition chemical vapor deposition(CVD) aluminum diffusion coating magnesium alloy corrosion resistance

FeMoAl COATING AND ITS HIGHTEMPERATURE SULFIDATION PROPERTIES

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中国有色金属学会会刊：英文版 1997年第2期7卷 119-123页

作者： Li, Fang he, yedong Qi, Huibin Huang, Zhenzhong Zhu, Rizhang Univ of Science and Technology Beijing Beijing China

ＦｅＭｏＡｌＣＯＡＴＩＮＧＡＮＤＩＴＳＨＩＧＨＴＥＭＰＥＲＡＴＵＲＥＳＵＬＦＩＤＡＴＩＯＮＰＲＯＰＥＲＴＩＥＳ①ＬｉＦａｎｇ，ＨｅＹｅｄｏｎｇ，ＱｉＨｕｉｂｉｎ，ＨｕａｎｇＺｈｅｎｚｈｏｎｇ，ＺｈｕＲｉｚｈａｎｇＢ... 详细信息

ＦｅＭｏＡｌＣＯＡＴＩＮＧＡＮＤＩＴＳＨＩＧＨＴＥＭＰＥＲＡＴＵＲＥＳＵＬＦＩＤＡＴＩＯＮＰＲＯＰＥＲＴＩＥＳ①ＬｉＦａｎｇ，ＨｅＹｅｄｏｎｇ，ＱｉＨｕｉｂｉｎ，ＨｕａｎｇＺｈｅｎｚｈｏｎｇ，ＺｈｕＲｉｚｈａｎｇＢｅｉｊｉｎｇＣｏｒｏｓｉｏｎａｎｄ...

关键词： FeMoAl coating high temperature sulfidation Al selective oxidation

SIMULATING EXPERIMENTS OF HOT CORROSION CELL

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中国有色金属学会会刊：英文版 1995年第4期5卷 41-44页

作者： Mu Daobin he yedong Zhu Rizhang(Department of Surface Science and Corrosion Engineering,University of Science and Technology Beijing,Beijing 100083) Univ of Science and Technology Beijing Beijing China

ＳＩＭＵＬＡＴＩＮＧＥＸＰＥＲＩＭＥＮＴＳＯＦＨＯＴＣＯＲＲＯＳＩＯＮＣＥＬＬＭｕＤａｏｂｉｎ；ＨｅＹｅｄｏｎｇ；ＺｈｕＲｉｚｈａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＳｕｒｆａｃｅＳｃｉｅｎｃｅａｎｄＣｏｒｒｏｓｉｏｎＥｎ... 详细信息

ＳＩＭＵＬＡＴＩＮＧＥＸＰＥＲＩＭＥＮＴＳＯＦＨＯＴＣＯＲＲＯＳＩＯＮＣＥＬＬＭｕＤａｏｂｉｎ；ＨｅＹｅｄｏｎｇ；ＺｈｕＲｉｚｈａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＳｕｒｆａｃｅＳｃｉｅｎｃｅａｎｄＣｏｒｒｏｓｉｏｎＥｎｇｉｎｅｅｒｉｎｇ，Ｕｎｉｖｅｒｓ...

关键词： macro cell basicity gradient oxygen activity