烧结钕铁硼电沉积Co-Mo-P/GO复合镀层及耐蚀性研究  

Electrodeposition of Co-Mo-P/GO composite coating on sintered NdFeB and its corrosion resistance

作　　者：李孝坤[1,2] 雷鸣科 黄帅 Li Xiaokun;Lei Mingke;Huang Shuai(Yellow River Conservancy Technical Institute,Kaifeng 475004,China;Henan Engineering Technology Research Center of Green Coating Materials,Kaifeng 475004,China;Kaifeng Key Laboratory of Materials for Water Remediation,Kaifeng 475004,China)

机构地区：[1]黄河水利职业技术学院,河南开封475004 [2]河南省绿色涂层材料工程技术研究中心,河南开封475004 [3]开封市水生态修复材料重点实验室,河南开封475004

出　　处：《电镀与精饰》2025年第2期1-8,29,共9页Plating & Finishing

基　　金：河南省重大科技专项(221100320200);河南省高等学校重点科研项目计划(21A170015)。

摘　　要：在烧结钕铁硼表面电沉积掺杂氧化石墨烯(Graphene Oxide,简写为GO)片的Co-Mo-P/GO复合镀层,采用X射线衍射仪、扫描电镜和能谱仪分析复合镀层的物相结构、形貌及表面成分,并采用电化学工作站结合浸泡腐蚀方法测试复合镀层的耐蚀性。结果表明:Co-Mo-P/GO复合镀层的表面成分主要为Co、Mo、P和C元素,与Co-P合金镀层和Co-Mo-P合金镀层相比具有更致密表面结构。Co-Mo-P/GO复合镀层的电荷转移电阻以及在频率为10^(–2)Hz处的阻抗模值分别达到3.12×10^(3)Ω·cm^(2)、9.64×10^(3)Ω·cm^(2),较烧结钕铁硼分别提高约1700Ω·cm^(2)、6500Ω·cm^(2),腐蚀电流密度(9.52×10^(–7)A/cm^(2))较烧结钕铁硼的降低幅度超过一个数量级。Co-Mo-P/GO复合镀层的腐蚀速率仅为4.42 mg/(cm^(2)·h),较烧结钕铁硼降低约59%,并且在3.5%氯化钠溶液中浸泡72 h后整体腐蚀程度最轻。GO在Co-Mo-P/GO复合镀层中呈较均匀分散状态,起到明显细化晶粒作用并且极大增加腐蚀阻力,因而复合镀层的耐蚀性好于Co-P合金镀层和Co-Mo-P合金镀层,能显著提高烧结钕铁硼的耐蚀性。Co-Mo-P/GO composite coating doped with graphene oxide(GO)flake powder was electrodeposited on the surface of sintered NdFeB.The phase structure,morphology and surface composition of the composite coating were analyzed by X-ray diffractometer,scanning electron microscopy and energy spectrometer,and the corrosion resistance of the composite coating was tested by electrochemical workstation combined with immersion corrosion method.The results show that the surface composition of Co-Mo-P/GO composite coating is mainly Co,Mo,P and C elements,and the surface structure is denser than that of Co-P alloy coating and Co-Mo-P alloy coating.The charge transfer resistance of Co-Mo-P/GO composite coating and the impedance mode value at the frequency of 10^(–2)Hz reach 3.12×10^(3)Ω·cm^(2) and 9.64×10^(3)Ω·cm^(2) respectively,which are about 1700Ω·cm^(2) and 6500Ω·cm^(2)and higher than those of sintered NdFeB.The corrosion current density of Co-Mo-P/GO composite coating is 9.52×10^(–7)A/cm^(2),which is more than one order of magnitude lower than that of sintered NdFeB,and the corrosion rate(4.42 mg/(cm^(2)·h))is about 59%lower than that of sintered NdFeB.The overall corrosion degree of Co-Mo-P/GO composite coating is the lightest after soaking in 3.5%sodium chloride solution for 72 h.Many GO are doped in Co-Mo-P/GO composite coating showing a relatively uniform dispersion state,which plays a significant role in refining grains and greatly increases corrosion resistance,so the corrosion resistance of the composite coating is better than that of Co-P alloy coating and Co-MoP alloy coating,and the composite coating can play a better anti-corrosion effect to significantly improve the corrosion resistance of sintered NdFeB.

关 键 词：Co-Mo-P/GO复合镀层 电沉积 烧结钕铁硼 氧化石墨烯 耐蚀性 

分 类 号：TQ153.6[化学工程—电化学工业]