Ni/n-SiO2 composite coating was electrodeposited by brush-plating with pulse-reverse current（RC）. The morphology, hardness, and tribological properties of the coating were investigated and compared with those of Ni ...Ni/n-SiO2 composite coating was electrodeposited by brush-plating with pulse-reverse current（RC）. The morphology, hardness, and tribological properties of the coating were investigated and compared with those of Ni and composite coatings electrodeposited with direct current（DC）. The results indicate that Ni/n-SiO2 composite coating electrodeposited by RC, because of RC and the nano powders, has denser coating, finer crystal grains, higher hardness（HV650.0, nearly 1.5 times higher than that of Ni coating electrodeposited by DC） and lower friction coefficient（nearly 0.62）, as a result, in the wearing experiment, the Ni/n-SiO2 composite coating electrodeposited by RC has the least worn loss. So this kind of coating has better wear resistance. And RC electro brush-plating can be used as a new technology of brush-plating in the area of wear resistance.展开更多
An automatic brush-plating system was developed for component remanufacturing. With this system, Ni/nano-alumina composite coatings from an electrolyte containing 20g/L nano-alumina particles were prepared. Microstr...An automatic brush-plating system was developed for component remanufacturing. With this system, Ni/nano-alumina composite coatings from an electrolyte containing 20g/L nano-alumina particles were prepared. Microstructure, surface morphology, microhardness and wear resistance of automatically plated coatings and manually plated coatings were investigated comparatively. The results show that the automatically plated coatings are relatively dense and uniform and have lower friction coefficient of 0.089 under lubricant condition, when compared with manually plated coatings with friction coefficient of 0.14.展开更多
This paper studied the wear characteristics as well as the wear mechanism of the Ni-P alloy brush-plating coating by means of sliding-wear tests, SEM and X Ray analyses. The results show that Ni-Palloy coating has exc...This paper studied the wear characteristics as well as the wear mechanism of the Ni-P alloy brush-plating coating by means of sliding-wear tests, SEM and X Ray analyses. The results show that Ni-Palloy coating has excellent wear-ability in high temperature, and the wear mechanism of the coating is that both the adhesive wear and abrasive wear exist in a boundary lubrication condition. The wear model was built up.展开更多
The paper is mainly about electron brush-plating technique of Cr12MoV die steel and its wear resistance.Through using different parameters of brushing plating for making the coating,the coating with better wear resist...The paper is mainly about electron brush-plating technique of Cr12MoV die steel and its wear resistance.Through using different parameters of brushing plating for making the coating,the coating with better wear resistance was selected.The results indicate that the coating of Ni and Ni-W are better at the voltage of 15 and 10 V.For the same plating time of Ni and Ni-W coating,the wear-resistance of the Cr12MoV die steel can be improved by 6.4 and 3.9 times,respectively.展开更多
Trivalen t Cr layers are studied by direct current brush- plating and pulse current brush-plating. Under the SEM,the appearence,the morphology of cross sections and normal sec- tions of the layers are observed a...Trivalen t Cr layers are studied by direct current brush- plating and pulse current brush-plating. Under the SEM,the appearence,the morphology of cross sections and normal sec- tions of the layers are observed and analysed,the hardness, bond intensities and corrosion- resis- tance are measured. Then, the election- probe and X ray diffraction instruments are used to study the bond and harden mechanism of lavers,The result of research shows that: the harden ef- fect of the layers is caused by the extra- fine grains and internal stress in the layers. And the lay- ers and basis are joined by mechanical bond,metal bond and diffuse bond. All these kinds of bonds lie on different places of interface, they make the layers and base metal unit well.展开更多
文摘Ni/n-SiO2 composite coating was electrodeposited by brush-plating with pulse-reverse current（RC）. The morphology, hardness, and tribological properties of the coating were investigated and compared with those of Ni and composite coatings electrodeposited with direct current（DC）. The results indicate that Ni/n-SiO2 composite coating electrodeposited by RC, because of RC and the nano powders, has denser coating, finer crystal grains, higher hardness（HV650.0, nearly 1.5 times higher than that of Ni coating electrodeposited by DC） and lower friction coefficient（nearly 0.62）, as a result, in the wearing experiment, the Ni/n-SiO2 composite coating electrodeposited by RC has the least worn loss. So this kind of coating has better wear resistance. And RC electro brush-plating can be used as a new technology of brush-plating in the area of wear resistance.
文摘An automatic brush-plating system was developed for component remanufacturing. With this system, Ni/nano-alumina composite coatings from an electrolyte containing 20g/L nano-alumina particles were prepared. Microstructure, surface morphology, microhardness and wear resistance of automatically plated coatings and manually plated coatings were investigated comparatively. The results show that the automatically plated coatings are relatively dense and uniform and have lower friction coefficient of 0.089 under lubricant condition, when compared with manually plated coatings with friction coefficient of 0.14.
文摘This paper studied the wear characteristics as well as the wear mechanism of the Ni-P alloy brush-plating coating by means of sliding-wear tests, SEM and X Ray analyses. The results show that Ni-Palloy coating has excellent wear-ability in high temperature, and the wear mechanism of the coating is that both the adhesive wear and abrasive wear exist in a boundary lubrication condition. The wear model was built up.
基金North China Institute of Aerospace Engineering"XK-2010-05-Z"
文摘The paper is mainly about electron brush-plating technique of Cr12MoV die steel and its wear resistance.Through using different parameters of brushing plating for making the coating,the coating with better wear resistance was selected.The results indicate that the coating of Ni and Ni-W are better at the voltage of 15 and 10 V.For the same plating time of Ni and Ni-W coating,the wear-resistance of the Cr12MoV die steel can be improved by 6.4 and 3.9 times,respectively.
文摘Trivalen t Cr layers are studied by direct current brush- plating and pulse current brush-plating. Under the SEM,the appearence,the morphology of cross sections and normal sec- tions of the layers are observed and analysed,the hardness, bond intensities and corrosion- resis- tance are measured. Then, the election- probe and X ray diffraction instruments are used to study the bond and harden mechanism of lavers,The result of research shows that: the harden ef- fect of the layers is caused by the extra- fine grains and internal stress in the layers. And the lay- ers and basis are joined by mechanical bond,metal bond and diffuse bond. All these kinds of bonds lie on different places of interface, they make the layers and base metal unit well.
