电沉积Ni-P非晶纳米SiC复合镀层的工艺研究

Electroplating Technology for Amorphous Ni-P/Nano-SiC Composite Coating

为了提高非晶镀层的硬度,在N i-P镀液中加入高硬度、高耐磨性的纳米微粒SiC,采用电沉积方法制备了N i-P非晶纳米SiC复合镀层。研究了工艺温度、电流密度和镀液中SiC浓度对非晶纳米复合镀层中P含量和SiC纳米颗粒分布的影响,并用扫描电镜对镀层表面进行了观察,通过纳米显微力学探针测量了镀层硬度。结果表明:随电流密度增大和镀液中SiC含量的增加,镀层中纳米SiC的复合量增加;镀液温度在60℃时,镀层中SiC含量最大,复合镀层的硬度显著提高,可达到7.4 GPa,比普通的N i-P非晶镀层大为提高。

Hard and wear-resistant nanoparticles of SiC were introduced in the electroplating bath for amorphous Ni-P coating so as to prepare Ni-P/nanoSiC composite coating.The influences of the technological parameters such as bath temperature,current density,and SiC concentration in the plating bath on the P content and distribution of nano-SiC in the composite coating were investigated.The morphologies of the composite coatings were observed using a scanning electron microscope,while the hardness of the coatings was determined using a nano-microhardness instrument.It was found that the content of nano-SiC in the composite coating increased with increasing electric current and the concentration of SiC in the plating bath.Moreover,the incorporation of nano-SiC contributed to greatly increase the hardness of the Ni-P coating prepared at a bath temperature of 60 ℃,with the maximum hardness of the Ni-PSiC composite coating to be as much as 7.4 GPa,which is much larger than that of the amorphous Ni-P coating.