目的：研究 TiCN 粉末表面镀 Co 时,镀液 pH 值对施镀过程的影响。方法采用低温化学镀工艺在 TiCN 粉末表面镀 Co。用氨水调节镀液的初始 pH 值,考查初始 pH 值对镀层形成速率的影响及 pH值在施镀过程中的变化情况。分析施镀前后,TiCN 表面相和形貌的变化。结果在碱性范围内,随着镀液初始 pH 值的增加,镀速呈先增大、后减小的趋势。镀液初始 pH 值为9时,镀速最高,且随着施镀的进行,镀液 pH 值明显降低,有大量气泡产生,大约0.5 h 后,pH 值趋于稳定。 TiCN 表面镀覆了较完整的 Co层。结论通过控制镀液的初始 pH 值,可以调整 TiCN 表面镀 Co 的效率。在85℃的温度下,镀液 pH为9时,能得到较高的镀覆效率。
Objective To study the effect of plating solution pH on the electroless plating process during the Co plating on the surface of TiCN powder. Methods Co was coated on the surface of TiCN powder by low-temperature electroless plating. The initial pH of the plating solution was adjusted by ammonium, and the effect of initial pH on the coating formation rate and the change of pH during the plating process were studied. Besides, the changes in phase composition and surface morphology of TiCN before and after plating were analyzed. Results Within the alkaline range, the plating rate first increased and then decreased with the increas-ing initial pH of the plating solution. The highest plating rate was observed when the initial pH of the plating solution was 9. During the plating process, the pH of the plating solution decreased obviously, with the production of a large amounts of bubbles. After 0. 5 h, the pH value became stable. A uniform Co coating formed on the surface of TiCN. Conclusion By adjustment the initial pH of the plating solution, the efficiency of Co plating on the surface of TiCN. High plating rate was observed at pH=9 and 85 ℃ .
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