Du Dandan,Tian Xiaodong,Lu Jiacheng.Microstructure and properties of Ni-SiC-CaF2 composite coatings on aluminum alloy surface[J].Plating & Finishing,2024,(10):16-20.
铝合金表面Ni-SiC-CaF2复合镀层的组织和性能研究
- Title:
- Microstructure and properties of Ni-SiC-CaF2 composite coatings on aluminum alloy surface
- Keywords:
- electroplating; composite coating; silicon carbide; calcium difluoride
- 分类号:
- TQ153
- 文献标志码:
- A
- 摘要:
- 在1060铝合金表面制备Ni-SiC-CaF2复合镀层，用NiSO4?6H2O、NiCl2?6H2O、H3BO3和PVP配置镀液。在pH为4的条件下，研究施镀温度、电流密度和镀液中SiC浓度对Ni-SiC-CaF2复合镀层组织的影响；通过扫描电子显微镜、X射线衍射仪、能谱仪、显微硬度计、摩擦磨损试验机等对镀层的表面、截面形貌、组织和性能进行检测与分析，同时对比纯Ni镀层、Ni-SiC、Ni-SiC-CaF2复合镀层的摩擦磨损性能。结果表明：施镀温度为35~50 ℃，电流密度为5 A/dm2，镀液中添加SiC含量为60~80 g/L时，可形成组织稳定的含有8.26 at.%~8.95 at.% SiC和0.46 at.%~0.62 at.% CaF2的复合镀层。相同工艺条件下，所制备的Ni-SiC-CaF2复合镀层相较于纯Ni镀层和Ni-SiC复合镀层，摩擦系数分别降低了67.50 %和35.00 %，磨损速率分别降低了41.27 %和26.14 %。
- Abstract:
- Ni-SiC-CaF2 composite coating was prepared on the surface of 1060 aluminum alloy with NiSO 4?6H2O, NiCl2?6H2O, H3BO3 and PVP as plating solution under the conditions of pH=4. The effects of plating temperature, current density and SiC concentration in plating solution on the microstructure of Ni-SiC-CaF 2 composite coating were studied. The surface, cross section morphology, microstructure and properties of the coatings were detected and analyzed by scanning electron microscope, X-ray diffractometer, energy spectrometer, microhardness tester and friction and wear testing machine. Meanwhile, the friction and wear properties of pure Ni coating, Ni- SiC and Ni-SiC-CaF 2 composite coating were compared. The results show that the stable composite coatings containing 8.26 at.%-8.95 at.% SiC and 0.46 at.%-0.62 at.% CaF 2 can be formed when the plating temperature is 35-50 ℃, the current density is 5 A/dm 2 and the content of SiC in the plating solution is 60-80 g/L. Under the same process conditions, the prepared Ni-SiC-CaF 2 composite coating shows a 67.50 % and 35.00 % decrease in friction coefficient, and a 41.27 % and 26.14 % decrease in wear rate compared to pure Ni coating and Ni- SiC composite coating, respectively.
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