颗粒导电性对铁-硅复合镀层形貌及硅含量的影响

Effects of conductivity of particle on morphology and silicon content of Fe-Si composite coating

将硅含量(质量分数)为30%,50%和70%的铁硅合金粉和纯硅粉作为复合电沉积法制备高硅镀层的颗粒,研究颗粒的导电性对镀层形貌及硅含量的影响。研究结果表明:颗粒硅含量越低,其导电性越高;采用水平电极电镀时,颗粒硅含量是影响镀层硅含量的主要因素;而采用竖直电极电镀时,颗粒的电导率是影响镀层硅含量的主要因素,由Fe-30%Si合金颗粒电镀获得的镀层硅含量最高,而且镀层中颗粒形貌由原来不规则状变为圆丘状,而纯硅颗粒形貌没有发生明显变化,说明在电镀的过程中颗粒的导电性能促进其共沉积。

The iron-silicon alloy particles with different silicon content （30%, 50% and 70%） and silicon particles were added to electrolyte to prepare high silicon coatings, and the effects of conductivity of the particle on the morphology and silicon content of coatings were discussed. The result shows that the particles with lower silicon content have higher conductivity, and the silicon content of particle is the main factor affecting the silicon content of coatings when adopting horizontal electrode. However, the conductivity is the main factor to affect the silicon content of coating when with vertical electrode and the morphology of Fe-30%Si particles become dome-shaped from irregular shape when the morphology of silicon particle does not change obviously, which shows that high conductivity can promote the incorporation of particles into coatings.