不同的SiC纳米颗粒镀前处理对Ni-SiC纳米复合镀层性能的影响

Effect of Pretreatment Modes of Silicon Carbide Nanoparticulates on the Properties of Electroplated Ni-SiC Nanocomposite Coatings

借助电化学阻抗谱测试技术和显微硬度测试技术,对比分析了不同的SiC纳米颗粒镀前处理和不同的电流密度对Ni-SiC纳米复合镀层耐腐蚀性能和硬度的影响。结果表明:采用阴离子表面活性剂十二烷基硫酸钠(SDS)对SiC纳米颗粒作镀前处理提高了复合镀层的耐腐蚀性能和硬度,而采用阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)则降低了镀层的耐腐蚀性能和硬度;超声波式磁力搅拌镀前处理的方式不影响复合镀层的耐腐蚀性能,但影响其硬度;增大电镀时的电流密度,可以提高复合镀层的耐腐蚀性能和硬度。

The effects of pretreatment modes of SiC nanoparticles and current density on the corrosion resistance and hardness of electroplated Ni-SiC nanocomposite coatings were investigated by using electrochemical impedance spectroscopy and microhardness tests. Results show that as compared with the Ni-SiC nanocomposite coatings prepared from the bath without surfactants, the coatings obtained from the bath containing anionic-surfactant sodium dodecyl sulfate (SDS) had better corrosion resistance and higher microhardness. However, cationic-surfactant cetyl trimethyl ammonium bromide (CTAB) had an opposite influence on the corrosion resistance and microhardness of the Ni-SiC nanocomposite coatings. Besides, ultrasonic-magnetic stirring of SiC nanoparticles had no effect on the corrosion resistance of the nanocomposite coatings, but had an influence on the microhardness. Increasing current density was helpful to improving the corrosion resistance and microhardness of the nanocomposite coatings.