pH值对Ni-Fe-P化学镀层结构与磁性质的影响  

The Effect of pH Value on the Composition and the Magnetic Performance of Electroless Ni-Fe-P Alloy

作　　者：王森林[1] 

机构地区：[1]华侨大学材料科学与工程学院,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2006年第3期262-265,共4页Journal of Huaqiao University(Natural Science)

基　　金：福建省自然科学基金资助项目(E0210020)

摘　　要：以硼酸为缓冲剂，柠檬酸钠为络合剂，在弱碱性体系中化学沉积Ni-Fe-P合金．采用电子能谱仪、X射线衍射仪、透射电镜和振动样品磁强计，研究镀液pH值和NiSO4／FeSO4物质量的比等对镀层组成、结构和磁性能的影响．结果表明，在化学沉积Ni-Fe-P合金中，Fe随着Ni被还原而共沉积，但镀层中Fe原子数分数不高，属诱导共沉积机理．镀液pH值的提高有利于Fe的还原沉积，但会使镀层中P原子数分数稍微降低，约为17．81％～22．0％，属于中高磷镀层．沉积条件对Ni-Fe-P镀层的结构影响不大，合金镀态均为非晶态或微晶结构．Ni-Fe-P合金的磁性能与沉积条件密切相关，随着镀层中铁原子数分数的增加，镍原子数分数降低，镀层的饱和磁化强度和剩余磁化强度均增加．Ni-Fe-P alloy has been electrolessly deposited from a alkaline bath containing boric acid as a buffer agent and sodium citrate as a complexing agent. The effect of deposition parameters, such as pH value and molar ratio of NiSO4FeSO4 on the composition, the structure and the magnetic performance of the deposits was studied by EDX, XRD, TEM and VSM. In the electroless deposition of Ni-Fe-P alloy, iron can be reduced and co-deposited with nickel, but iron content in deposits does not reach high value. The mechanism of co-deposition of Ni-Fe-P alloy is the inductive co-deposition. The increase of pH value of bath favors the reducementof iron, but can decrease phosphorus content in deposits. The phosphorus content of the Ni-Fe-P deposits is high which ranges from 17.81 at% to 22.0 at%. The Ni-Fe-P alloy plated at all conditions is amorphous or microcrystallite structure. The magnetic performance of Ni-Fe-P alloy dependson the plating conditions, and the saturation magnetization and the residual magnetization of the deposit increase with the increase of the iron content in deposits. Keywords electroless-deposition, Ni-Fe-P alloy, pH value, structure, magnetic performance

关 键 词：化学沉积 NI-FE-P合金 PH值 镀层结构 磁性能 

分 类 号：TG174.445[金属学及工艺—金属表面处理] O646[金属学及工艺—金属学]