Chao Shuang,Cao Jingjing,*,et al.The influence of micro/nano SiCP particle size and concentration on the structure and properties of electroless Ni-P-SiC P composite coatings[J].Plating & Finishing,2025,(01):81-90.
doi: 10.3969/j.issn.1001-3849.2025.01.013 微纳SiCP粒度和浓度对化学镀Ni-P-SiCP
- Title:
- The influence of micro/nano SiCP particle size and concentration on the structure and properties of electroless Ni-P-SiC P composite coatings
- 关键词:
- 42CrMo钢; 微纳SiC微粒; Ni-P-SiCP复合镀层; 耐蚀性; 沉积机理
- Keywords:
- 42CrMo steel; micro/nano SiC particles; Ni-P- SiCP composite coating; corrosion resistance; deposition mechanism
- 分类号:
- TG178
- 文献标志码:
- A
- 摘要:
- 以微纳SiC为第二相微粒，在42CrMo钢表面制备Ni-P-SiCP复合镀层，研究了微纳SiCP的粒度（5 μm和0.5 μm）和浓度对化学镀Ni-P-SiCP复合镀层沉积速率、表面形貌、成分、显微硬度和耐蚀性的影响，并结合Ni-P-SiCP复合镀层截面形貌和成分分布，探讨了Ni-P-SiCP复合镀层的沉积机理。结果表明：SiCP的添加抑制了化学沉积反应，导致Ni-P-SiCP复合镀层的沉积速率下降，但0.5 μm的SiCP对沉积反应的抑制作用较弱，形成的Ni-P-SiCP-0.5复合镀层表面的胞状物尺寸更均匀、平整、致密，随SiCP浓度的增加，Ni-P-SiCP复合镀层的沉积速率下降，复合镀层表面的Ni∶P增加；当SiCP浓度7 g/L时，复合镀层表面的SiCP发生堆积或团聚。当SiCP浓度为5 g/L时，Ni-P-SiCP-0.5复合镀层的显微硬度最大，约753 HV，耐蚀性也最优，自腐蚀电位为?0.363 V。浸润处理后的SiC微粒表面带负电，吸附大量的Ni2+，向基底表面运动，与Ni、P均匀的共沉积到基底表面，共沉积的SiCP在复合镀层中具有弥散强化和惰性物理屏障的作用，使Ni-P-SiCP复合镀层具有更高的硬度和更优的耐蚀性。
- Abstract:
- A Ni-P-SiCP composite coating was prepared on the surface of 42CrMo steel using micro/nano SiC as the second-phase particles. The influence of micro/nano SiC? particle size (5 μm and 0.5 μm) and concentration on the deposition rate, surface morphology, composition, microhardness, and corrosion resistance of electroless Ni-P-SiCP composite coatings was investigated. Additionally, by combining the cross-sectional morphology and composition distribution of Ni-P-SiC P composite coatings, the deposition mechanism of Ni-P-SiC P composite coatings was explored. The results show that the addition of SiC P inhibits the chemical deposition reaction, resulting in a decrease in the deposition rate of Ni-P-SiCP composite coating. However, 0.5 μm SiC P has a weak inhibitory effect on the deposition reaction, and the cell size on the surface of the formed Ni-P-SiC P-0.5 composite coating is more uniform, flat and dense. With the increase of SiC P concentration, the deposition rate of Ni-P-SiC P composite coating decreases, and the Ni∶P on the surface of the composite coating increases. When the concentration of SiC P is 7 g/L, the SiC P on the surface of the composite coating accumulates or agglomerates. When the concentration of SiC P is 5 g/L, the microhardness of Ni-P-SiC P-0.5 composite coating is the largest, about 753 HV, and the corrosion resistance is also the best, the self-corrosion potential is ?0.363 V. The surface of SiC particles after infiltration treatment is negatively charged, and a large amount of Ni 2+ is adsorbed and moves to the surface of the substrate. The SiC particles are uniformly co-deposited with Ni and P to the surface of the substrate. The co-deposited SiC P has the effect of dispersion strengthening and inert physical barrier in the composite coating, which makes the Ni-P-SiC P composite coating have higher hardness and better corrosion resistance.
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