在Watt镀液中加入玻璃球, 玻璃球以不同频率垂直撞击试样表面形成机械研磨. 考察了震荡频率和球直 径对镍镀层晶粒细化的影响以及机械研磨对晶粒生长的影响. SEM表面观察表明, 机械研磨改变了镀层晶粒的生 长方式, 使镀层晶粒明显细化, 镀层表面光滑. 在电沉积过程中施加机械研磨, 玻璃球的撞击会在镀层表面产生 宏观和微观缺陷, 增加形核中心, 提高形核速率; 玻璃 球撞击晶粒尖端, 使得镀层表面变得平整, 有利于电力线均匀分布, 促进形核, 避免了晶粒不均匀长大.
The mechanical attrition (MA) action was supplied in a traditional electroplating process by the vertical movement of glass balls on the sample surface with a special vibrating frequency. The effect of vibrating frequency and the diameter of glass balls on the grain refinement were observed. The effect of MA on grain growth was also studied. It is demonstrated from FESEM results that the new coating shows smooth and refinement surface morphology by supplying MA. The further studies showed that the grain refinement and slow grain growth could be obtained by supplying MA. The nucleation of new grains increased with the increasing the macro and micro defects on the surface of coating induced by MA. The deposited atom was forced to slide to valley when the glass balls bumped on big grains, which made the coating surface smooth. The uniformity current line could be obtained on the smooth surface, which can increase the nucleation rate and hinder the grain growth.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%