Ni–Co/SiC composite coatings were prepared on stainless steel substrate by high-frequency pulse electro-deposition. The effects of SiC content in plating bath, pulse frequency, duty cycle, and current density on the Si content of Ni–Co/SiC composite coating were studied. The optimal process parameters were obtained as follows:nano-SiC 8 g/L, pulse frequency 60 kHz, average current density 3-4 A/dm2, duty cycle 0.32, temperature 40 °C, pH 4.0-5.0, and time 60 min. The surface morphologies and crystal structures of Ni–Co/SiC and Ni–Co coatings were compared. The results showed that the surface of Ni–Co/SiC composite coating is more compact and uniform than that of Ni–Co alloy coating, indicating that the incorporation of SiC particles has grain refining effect.%采用高频脉冲电沉积法在不锈钢板上制备 Ni-Co/SiC 复合镀层。研究了镀液中 SiC 含量、脉冲频率、占空比以及平均电流密度对复合镀层中Si含量的影响，得到的较佳工艺参数为：纳米SiC 8 g/L，脉冲频率60 kHz，平均电流密度3~4 A/dm2，占空比0.32，温度40°C，pH 4.0~5.0，时间60 min。对比研究了较佳工艺下制备的Ni-Co/SiC和Ni-Co镀层的表面形貌和相结构。结果表明，Ni-Co/SiC 复合镀层的表面比 Ni-Co 合金镀层更细致均匀，SiC具有细化镀层晶粒的作用。
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