采用化学镀方法在20钢基体表面制备了Ni-P-Al2O3镀层,研究温度、Al2O3粒子浓度及pH值等工艺参数对Ni-P-Al2O3镀层的影响规律,并利用透射电镜(TEM)和原子力显微镜(AFM)观察不同工艺参数下所制备镀层的微观组织.结果表明,当温度80 ℃、Al2O3粒子浓度2 g/L、pH值4.8时,Ni-P-Al2O3镀层的沉积速率最大,其最大值为8.7 μm/h;在最佳工艺参数下制备的Ni-P-Al2O3镀层表面较为平整,组织结构较为紧密,并存在较多Al2O3粒子均匀的镶嵌在镀层中,其平均粒径在20 nm左右.
Ni-P-Al2O3 coatings were prepared on the surface of 20 steel by using electroless plating, and the effects of temperature, Al2O3 particle concentration and pH on Ni-P-Al2O3 coatings were discussed in detail.In addition, the microstructure prepared by different parameters deposition was observed by using transmission electron microscope (TEM) and atomic force microscope (AFM).The results indicated that the deposition rate was maximum deposited at the temperature of 80 ℃, Al2O3 particle concentration of 2 g/L and pH of 4.8, and the maximum rate was 8.7 μm/h.The microstructure of Ni-P-Al2O3 coatings prepared under above-mentioned condition was smooth, and many Al2O3 particles are uniformly embedded in the coating, the average particle size of Al2O3 particles was approximately 20 nm.
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