Corrosion Resistance of FeSiB and FeCuNbSiB Alloys and Its Influence on Their Soft Magnetic Properties in NaOH Solution

摘要:

非晶Fe78Si9B13和纳米晶Fe73.5Cu1Nb3Si13.5B9合金由于具有低矫顽力、高磁导率和高饱和磁通密度等特点而受到广泛关注。研究了Fe78Si9B13及 Fe73.5Cu1Nb3Si13.5B9 合金在NaOH（pH=9~10）溶液中的耐腐蚀性能, 及其对软磁性能的影响。分析了经腐蚀后合金的有效磁导率、矫顽力和饱和磁感应强度等软磁性能的改变。样品用X射线衍射和3D高景深显微镜进行表征。结果显示：腐蚀后溶液中有橙色铁的氧化物产生，合金结构保持不变。经腐蚀后Fe78Si9B13及 Fe73.5Cu1Nb3Si13.5B9合金的软磁性能下降，且Fe78Si9B13非晶合金的有效磁导率ue和饱和磁感应强度Bs比Fe73.5Cu1Nb3Si13.5B9纳米晶合金下降快

Abstract:

Amorphous Fe78Si9B13 and nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloys with low coercivity, high saturation magnetic flux density and high permeability have attracted extensive attention. In this paper the influence of corrosion on their soft magnetic properties of Fe78Si9B13 and Fe73.5Cu1Nb3Si13.5B9 alloys tested in the NaOH solution (pH=9~10) was investigated. Changes of soft magnetic properties including effective permeability, coercivity and saturated magnetic flux density were analyzed. The samples were characterized by X-ray diffraction and 3D high depth of field microscope. The results show that some orange precipitates corresponding to an iron oxide are produced in the solution after corrosion, and the structures of Fe78Si9B13 and Fe73.5Cu1Nb3Si13.5B9 alloys remain unchanged. The soft magnetic properties of these alloys decrease after corrosion. The decrease of effective permeability μe and saturated magnetic flux density Bs, after corrosion, observed in the amorphous Fe78Si9B13 sample, was larger than that observed in the nanocrystalline Fe73.5Cu1Nb3Si13.5B9 sample.