烧结钕铁硼表面复合电沉积氧化石墨烯镀锌层

发布时间：2018-09-02 10:10

【摘要】：目的烧结钕铁硼(NbFeB)是一种应用范围非常广泛的多孔磁性材料,由于多孔结构易发生腐蚀,需在其表面制备相应的镀层进行防护。方法利用电沉积法将提前制备的氧化石墨烯(GO)与镀锌溶液混合,在NdFeB基体表面电沉积制备出锌镀层与氧化石墨烯复合镀锌层。结果镀锌液中,氧化石墨烯(GO)的浓度、阴极电流密度以及搅拌速度,对复合镀锌层的表面微观形貌具有一定的影响,同时一定浓度的氧化石墨烯(GO)可以改变镀层的生长取向,Zn/rGO的优先生长晶面由(100)变成(002)。膜层的微观形貌从纯锌紧密堆积在一起的凸起晶粒变成了Zn/rGO的纳米片状形貌。交流阻抗和动电位极化曲线结果表明,镀Zn层和Zn/rGO复合镀锌层经过3.5%Na Cl溶液中浸泡后,Zn/rGO纳米复合镀层的耐腐蚀性能明显增加。结论相比于单一的镀锌层,Zn/GO复合镀锌层的耐腐蚀性明显增加。
[Abstract]:Objective Sintered NdFeB (NbFeB) is a kind of porous magnetic material with a wide range of applications. Due to the corrosion of porous structure, it is necessary to prepare the corresponding coating on its surface for protection. Methods the (GO) prepared in advance was mixed with zinc plating solution by electrodeposition method. The zinc coating and graphene oxide composite zinc coating were prepared on the surface of NdFeB substrate by electrodeposition. Results the concentration of graphene oxide (GO), cathode current density and stirring speed in zinc plating bath have some influence on the surface morphology of composite zinc coating. At the same time, a certain concentration of graphene oxide (GO) can change the growth orientation of the coating and the preferred growth surface of Zn / R go is changed from (100) to (002). The micromorphology of the film changed from the protruded grain tightly stacked together in pure zinc to the nanoscale morphology of Zn/rGO. Ac impedance and potentiodynamic polarization curves show that the corrosion resistance of ZnR / RGO nanocomposite coatings is obviously increased after the Zn and Zn/rGO composite galvanized coatings are soaked in 3.5%Na Cl solution. Conclusion the corrosion resistance of Zn / GO composite zinc coating is significantly higher than that of single zinc coating.
【作者单位】：北京航空航天大学;
【基金】：国家自然科学基金资助项目(U1637204)~~
【分类号】：TB306

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