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采用单脉冲电镀技术,在瓦特型镀液中,制备了Ni-SiC纳米复合镀层。采用X射线衍射仪(XRD)扫描电镜(SEM)分别表征了Ni-SiC纳米复合镀层相结构和表面形貌,通过静态浸泡腐蚀实验、磨损实验和高温氧化性能研究了复合镀层的性能。结果表明,在不同占空比下,Ni-SiC复合镀层的组织主要为Ni晶体;当占空比为70%时,复合镀层的显微硬度最大,为376 HV,摩擦系数最小;900℃、100 h高温氧化增重最小,为7.453 mg·cm-2为0.37。在3.5%Na Cl溶液中静态浸泡30 d后,占空比为70%时的复合镀层的失重最小,失重为3.063 mg·cm-2。
Single-pulse plating technology was used to prepare Ni-SiC nano-composite coatings in watt-type bath. The phase structure and surface morphology of Ni-SiC nanocomposite coatings were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The properties of composite coatings were studied by static immersion corrosion test, wear test and high temperature oxidation performance. The results show that the microstructure of the Ni-SiC composite coating is mainly Ni crystal under different duty cycles. When the duty cycle is 70%, the microhardness of the composite coating is the largest, 376 HV, the friction coefficient is the smallest; The highest weight gain at 100 h was 0.37 for 7.453 mg · cm-2. After static immersion for 30 d in 3.5% NaCl solution, the composite coating with the duty cycle of 70% has the least weight loss with a weight loss of 3.063 mg · cm-2.