摘要
The nanocrystalline Fe-Ni-Cr coatings were electrodeposited by using the pulse current technique.The SEM results showed that the coatings had a mixed morphology of small nodules and fine cauliflower structures at low current densities.Also,the Cr content was increased at expense of Fe and Ni contents at high current densities.XRD patterns confirmed that the pulse current density had a positive effect on the grain refinement.The results of vibrating sample magnetometer(VSM)measurements demonstrated that by increasing the current density,the saturation magnetization was decreased and the coercivity was increased due to the enhancement of Cr content and the reduction of the grain size.The friction coefficient and wear rate values were decreased by increasing the pulse current density.Also,both the adhesive and abrasive wear mechanisms were observed on the worn surfaces.The abrasive grooves and the amount of wear debris were decreased by increasing the pulse current density.
采用脉冲电流技术电沉积纳米晶Fe-Ni-Cr涂层。SEM测试结果表明,在低电流密度下,涂层为小结节和细小菜花结构的混合形态;而在高电流密度下,Cr含量随着涂层中Fe和Ni含量的降低而增加。XRD谱证实,脉冲电流密度对晶粒细化具有积极作用。振动样品磁强计(VSM)测量结果表明,随着电流密度的提高,由于Cr含量的增加和晶粒尺寸的减小,饱和磁化强度降低、矫顽力增大。通过提高脉冲电流密度,可以降低摩擦因数和磨损率。此外,在磨损表面观察到粘着和磨粒磨损机制。随着脉冲电流密度提高,犁沟和磨屑的数量减少。
基金
Financial support of this work by IMPRC
