Zhuo Jianfei,He Yubo,Wang Zhentao,et al.Optimization of cobalt electrodeposition process in Watts bath[J].Plating & Finishing,2023,(3):52-59.[doi:10.3969/j.issn.1001-3849.2023.03.008]
Watts型镀钴体系电沉积工艺优化
- Title:
- Optimization of cobalt electrodeposition process in Watts bath
- Keywords:
- cobalt ; electrodeposition ; Watts type ; process parameter ; coating hardness
- 分类号:
- TG174.451
- 文献标志码:
- A
- 摘要:
- 针对 Watts 型镀钴工艺,系统研究了 Co 2+ /H 3 BO 3 摩尔比、表面活性剂、 pH 、温度、电流密度等参数对镀层沉积速度、硬度及微观结构的影响规律,获得了较佳的 Watts 型镀钴工艺方案。结果表明:适当增加 Co 2+ 含量可以加快镀层沉积速度,但过高 Co 盐会使阴极极化度减小、镀层结晶粗大; Co 2+ /H 3 BO 3 摩尔比在 1.5 时, Co 2+ 的沉积电位较负、结晶更为细致。电流密度对镀层沉积速度影响最大,溶液 pH 值则显著影响镀层显微硬度;提高电流密度,镀层沉积加快,但镀层容易粗糙,电流密度可选择 4 A/dm 2 ;升高镀液 pH 值有助于获得细致镀层,但 pH > 5 后镀液易出现沉淀;温度在 40 ℃ 时镀层沉积速度和硬度均较佳。在优化的 Watts 型镀钴体系下所得镀层呈灰白色,晶粒呈棱片状,表面平整光滑,镀层硬度为 320 HV ,沉积速度为 22 μ m/h 。 GH4169 合金表面施镀 60 μ m 厚的钴镀层,可以显著改善其耐磨性。
- Abstract:
- : The effects of Co 2+ /H 3 BO 3 molar ratio , surfactant , pH , temperature and current density on the deposition rate , hardness and microstructure of the coating were systematically studied , and a better Watts type cobalt plating electroplating process was obtained. The results show that proper increase of Co 2+ content can increase the deposition rate of coating , but too high content of cobalt salt may reduce the cathode polarization and make coarse crystal grains. The deposition potential of Co 2+ is more negative and the coating grains are finer when the molar ratio of Co 2+ /H 3 BO 3 is 1.5. The current density has the greatest influence on the deposition rate of coating , but pH value of the solution significantly affects the coating hardness. If the current density is increased , the deposition of the coating is accelerated , but the coating is easy to be rough , and the current density can be selected as 4 A/dm 2 . Increasing pH value of the bath helps to obtain a fine coating , but the bath is prone to precipitation when pH > 5. Both the deposition rate and hardness of the coating are better when the temperature is 40 ℃. Under the optimized Watts cobalt plating system , the obtained coating is smooth and gray-white , the grains are prismatic , the hardness of the coating is 320HV , and the deposition rate is 22 μ m/h.The wear resistance of GH4169 alloy can be significantly improved by applying cobalt coating with the thickness of 60 μ m.
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备注/Memo
收稿日期: 2022-07-23 修回日期: 2022-08-18 作者简介: 卓健飞( 1970 —),女,高级工程师, email : 357090895@qq.com 通信作者: 王帅星, email : wsxxpg@126.com 基金项目: 中国航空发动机集团产学研合作项目( HFZL2020CXY026 )