摘要
近年来,复合化学镀技术在开发新材料的探索中已为人们所关注。本文在酸性化学镀Ni-P合金的溶液中,加入T-稳定剂,以TiN微粒为分散剂,成功地制备出一种新型的(Ni-P)-TiN复合镀层。实验结果表明,TiN微粒在镀层中的含量与镀液中的悬浮量的关系呈Langmuir等温吸附线的形式。当维持TiN在镀液中的悬浮量不变,镀层中的TiN含量还与镀液的pH值及温度有关。经试验测定,(Ni-P)-TiN复合镀层的硬度随微粒含量的增加而增加,与化学镀Ni-P合金相比,具有更高的硬度值。经400℃热处理后,该复合镀层的硬度比硬铬镀层的硬度高。镀层耐磨性试验结果表明,(Ni-P)-TiN复合镀层比化学镀Ni-P合金镀层及硬铬镀层具有更好的耐磨损性能,极适于在高温条件下工作,这种耐高温磨损的性能,可以弥补硬铬镀层之不足。此外,本文对(Ni-P)-TiN复合镀层的耐磨性机理进行了初步的探讨。
Anew type composite coating (Ni-P)-TiN was prepared successfully from the acidic bath for electroless Ni-P alloy plating with the addition of TiN particles and T-stabilizer. The experimental results show that the dependence of TiN particle content in the composite coating on its suspension amount in the bath exhibits the form of Langmuir isotherm of adsorption and that particle content in the coating depends on the pH value and temperature of the bath when other conditions remain constant. The hardness of the (Ni-P)-TiN composite coatings is greater than that of electroless plated Ni-P coatings and increases with the increase of TiN particle content in the coating. After heat treatment at 400℃, the hardness of the composite coatings is still greater than that of hard chromium coating. The wear resistance of the composite coatings is higher than that of electroless Ni-P alloy coatings and hard chromium coating. The composite coatings are suitable for working under high temperature conditions. The wear resistant mechanism of the (Ni-P)-TiN composite coatings was also discussed preliminarily.
出处
《电镀与精饰》
CAS
1991年第2期3-7,共5页
Plating & Finishing
