材料期刊网

Effect of Electroplating Parameters on Microstructure of Nanocrystalline Nickel Coatings

A.M. Rashidi A. Amadeh

材料科学技术（英）

In order to achieve the optimum conditions for electroplating nanocrystalline nickel coating from Watts-type bath, the effect of some process parameters namely, bath temperature, current density, and saccharin addition on grain size and texture coefficient (TC= I₍₂₀₀₎ /I₍₁₁₁₎ ) of the deposits were investigated by X-ray diffraction
(XRD). The results showed that in a bath containing 5 g/L saccharin, by increasing the bath temperature from 45°C to 55°C, the grain size decreased, whereas further increase of bath temperature resulted in a contrary effect. By increasing the current density from 10 to 75 mA/cm², both the grain size and TC decreased, while further increase in current density had no significant effect on the grain size. At a given current density, the grain size and TC decreased rapidly by increasing the saccharin content before leveling off at 3 g/L of saccharin. Finally, based on the grain refining the optimum conditions for producing nanocrystalline nickel coating from Watts-type bath have been proposed.

关键词: Electroplating , grain size , Nanocrystalline Coating

Effect of Electroplating Parameters on Microstructure of Nanocrystalline Nickel Coatings

材料科学技术（英）

关键词:

Ni-Al扩散界面及反应层生长动力学研究

肖强 , 李传军 , 袁兆静 , 余建波 , 钟云波 , 任忠鸣

上海金属

采用电镀法制备Ni-Al扩散偶,研究了Ni-Al扩散界面处中间相的形成及其生长动力学.结果表明,扩散偶界面处形成的中间相为NiAl3相和Ni2Al3相.Ni2Al3相的生长符合抛物线长大规律,受体扩散控制,NiAl3相的生长受晶界扩散和体扩散的控制.Ni2Al3的生长激活能Q=(155.6±4.05) kJ/mol,生长常数k0为5.23×10-4m2·s-1.

关键词: Ni-Al , 扩散偶 , 电镀 , 生长动力学

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

Zhaoxia PING

金属学报(英文版)

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 resistance and corrosion resistance of these coatings can be improved further.

关键词: Ni-P-SiC composite coating , electroplating , mechanical attrition