目的 制备性能良好的Ni-SiC复合镀层，以提高海洋平台系泊缆用22MnCrNiMo钢的耐腐蚀性和寿命。方法 采用基于离心力的双脉冲电沉积技术，在海洋平台系泊缆用22MnCrNiMo钢表面制备Ni-SiC纳米复合镀层。通过扫描电子显微镜和光学显微镜对复合镀层的微观形貌、组织结构进行分析。利用静态浸泡腐蚀试验分析了镀层的耐腐蚀性能。结果 添加0.2 g/L的SDS时，纳米SiC悬浮液具有最佳悬浮性能。纳米SiC颗粒的质量浓度为2.0~4.0 g/L时，有利于获得优异的Ni-SiC镀层表面形貌。随着占空比的增加，复合镀层表面的晶粒尺寸逐渐减小，当占空比为50%时，可以获得最佳的Ni-SiC镀层形貌。当添加2.0 g/L的纳米SiC颗粒时，镀层的腐蚀质量损失最小，为2.867 mg/cm2；当占空比为50%时，镀层的腐蚀质量损失最小，为3.059 mg/cm2。结论 添加分散剂后，镀液中的纳米SiC颗粒沉降性能变好；添加纳米SiC颗粒后，镀层的耐腐蚀性能增强。纳米SiC颗粒的添加量和占空比的大小对复合镀层的组织结构和耐腐蚀性能有重要影响。

The work aims to enhance corrosion resistance and life of mooring rope by preparing Ni-SiC composite coatings exhibiting excellent properties. The Ni-SiC composite coatings were prepared on the surface of 22MnCrNiMo steel for mooring rope on ocean platform by adopting centrifugal force-based double-pulse electrodeposition technology. Microstructure and structure of the composite coatings were analyzed by using scanning electron microscope and optical microscope. Corrosion resistance of the coating was analyzed by performing static immersion corrosion test. The nano-SiC suspension containing 0.2 g/L SDS exhibited the best suspension property. Certain concentration of nano-SiC particles (2.0~4.0 g/L) was beneficial to obtain excellent surface morphology of Ni-SiC coating. Grain size on the composite coatings decreased gradually as the duty cycle increased. Optimal morphology of Ni-SiC coating could be obtained at the duty cycle of 50%. Provided with 2.0 g/L nano-SiC particles, corrosion mass loss of the coating was the minimum, 2.867 mg/cm2; provided with the duty cycle of 50%, corrosion mass loss of the coating was the smallest, 3.059 mg/cm2. Settling performance of nano-SiC particles in the bath containing dispersant is better than that without dispersant. The corrosion resistance of the coating obtained by adding nano-particles is better than that of the pure nickel coating. Additive amount and duty cycle of the nano-SiC particles have significant effects on microstructure and corrosion resistance of the composite coatings during the process.