Li Xiaokun*,Lei Mingke,Huang Shuai.Electrodeposition of Co-Mo-P/GO composite coating on sintered NdFeB and its corrosion resistance[J].Plating & Finishing,2025,(02):1-8.
doi: 10.3969/j.issn.1001-3849.2025.02.001烧结钕铁硼电沉积Co-Mo-P/GO复合镀层及耐蚀性研究
- Title:
- Electrodeposition of Co-Mo-P/GO composite coating on sintered NdFeB and its corrosion resistance
- 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
- Keywords:
- Co-Mo-P/GO composite coating; electrodeposition; sintered NdFeB; graphene oxide; corrosion resistance
- 分类号:
- TQ153.6
- 文献标志码:
- A
- 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3.12×103 Ω·cm 2、9.64×103 Ω·cm 2，较烧结钕铁硼分别提高约1 700 Ω·cm2、6 500 Ω·cm2，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/(cm2·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。
- Abstract:
- 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 1 700 Ω·cm 2 and 6 500 Ω·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/(cm2·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-Mo-P alloy coating, and the composite coating can play a better anti-corrosion effect to significantly improve the corrosion resistance of sintered NdFeB
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