项腾飞,任黄威,周军,张世宏.磁场对钕铁硼表面电沉积Ni镀层性能的影响[J].表面技术,2024,53(2):88-96.
XIANG Tengfei,REN Huangwei,ZHOU Jun,ZHANG Shihong.Effect of Magnetic Field on Properties of Electrodeposited Ni Coating on NdFeB Surface[J].Surface Technology,2024,53(2):88-96 |
| 磁场对钕铁硼表面电沉积Ni镀层性能的影响 |
| Effect of Magnetic Field on Properties of Electrodeposited Ni Coating on NdFeB Surface |
| 投稿时间：2022-09-19 修订日期：2023-06-14 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.02.008 |
| 中文关键词: 烧结钕铁硼 电沉积 磁场强度 表面形貌 耐蚀性 |
| 英文关键词:sintered NdFeB electrodeposition magnetic field intensity surface topography corrosion resistance |
| 基金项目:国家自然科学基金(52201056);安徽省高校自然科学研究重点项目(KJ2021A0377) |
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| Author | Institution |
| XIANG Tengfei | School of Civil Engineering and Architecture, Anhui University of Technology, Anhui Ma'anshan 243002, China;Sinosteel Tianyuan Co., Ltd., Anhui Ma'anshan 243002, China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui Ma'anshan 243002, China |
| REN Huangwei | Sinosteel Tianyuan Co., Ltd., Anhui Ma'anshan 243002, China |
| ZHOU Jun | School of Civil Engineering and Architecture, Anhui University of Technology, Anhui Ma'anshan 243002, China |
| ZHANG Shihong | Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui Ma'anshan 243002, China |
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| 中文摘要: |
| 目的 研究不同磁场参数对钕铁硼表面电沉积Ni镀层性能的影响。方法 以烧结钕铁硼(NdFeB)为基体，采用磁场辅助电沉积方法在其表面镀覆Ni层。利用扫描电镜(SEM)、EDS能谱仪、X射线衍射仪(XRD)分析镀层的表面形貌、元素组成和微观结构，通过电化学工作站对Ni镀层进行耐蚀性能研究。结果 施加磁场能显著改善镀层的表面形貌，表面镀层形貌更加均匀致密;试样的耐蚀性显著提高，在平行磁场方向下，当磁场强度为0.07 T时电沉积30 min，所得Ni镀层自腐蚀电位(Ecorr)为–0.193 V，自腐蚀电流密度(Jcorr)为8.305×10–7 A.cm–2，阻抗值达到3.882×104 Ω.cm2，耐蚀性最好。结论 施加磁场后，镀层性能得到改善，平行磁场作用下Ni镀层更加均匀细致，其耐蚀性最优，垂直磁场次之，均优于无磁场作用下制备的Ni镀层。 |
| 英文摘要: |
| NdFeB is widely applied in many fields such as new energy vehicles, domestic appliances, electronics and so forth. However, the corrosion of NdFeB limits its service life in these fields. Thus, surface treatments are necessary for NdFeB, among which electrodeposition is one of the most useful techniques due to its simple process, convenient operation and low cost. In recent years, the technology of magnetic field electrodeposition (MFE) develops rapidly. Scientists find that the existence of magnetic field exhibits large effect on electrodeposition coatings. However, the MFE is rarely applied on NdFeB. Herein, the MFE technique was adopted to deposit a metallic Ni coating on the NdFeB surface. In this paper, the effect of magnetic field on the properties of the electrodeposited Ni coating on the NdFeB surface was studied systematically. Before deposition, the NdFeB was first decreased by 5 g/L sodium hydroxide, 50 g/L anhydrous sodium carbonate, 75 g/L anhydrous trisodium phosphate and 0.5 g/L OP emulsifier for 10 min at 70 ℃. Then, 40 mL/L nitric acid was used for derusting the resultant NdFeB sample, which was afterwards activated by 30 mL/L hydrochloric acid at ambient temperature. At last, a Ni layer was electrodeposited on the sintered NdFeB surface by magnetic field electrodeposition with ultrasound assistance. It was worth noting that the current density was firstly set as 4 A/dm2 for 1 min to pre-deposit a fresh Ni layer and then immediately adjusted to 2.5 A/dm2 and kept for 30 min. The magnetic field direction was regulated by changing the direction of the sample while the magnetic field intensity was adjusted by adding NdFeB permanent magnet material. The surface morphology of coatings was investigated with a scanning electron microscope (SEM) while the component of coatings was analyzed with an equipped energy dispersive spectrometer (EDS). Besides, the microstructure of the coatings was characterized with an X-ray diffraction (XRD) from 10° to 80° with a scanning rate of 2°/min and the thickness of the coatings was measured with a thickness gauge. The corrosion resistance of the Ni coating was studied through an electrochemical workstation. The results showed that the surface morphology of the coating could be significantly changed by applying a magnetic field, and had slight effect on the thickness of the coating. More importantly, corrosion resistance of the coating was remarkable improved. The morphology of the coating was uniform and compact; the roughness of coatings was decreased under MFE; the thickness of the coating stated at 9-11 μm. The self-corrosion potential (Ecorr), self-corrosion current density (Jcorr) and impedance value of the Ni coating electrodeposited for 30 min under the parallel magnetic field with 0.07 T were –0.193 V, 8.305×10–7 A.cm–2 and 4.050×104 Ω.cm2, respectively. It showed the best temperature resistance and corrosion resistance. As a whole, the parallel magnetic field shows a positive effect on the properties of the coating. A compact coating is obtained on the surface of NdFeB through the MFE, and the corrosion resistance of the sample prepared under the parallel magnetic field shows the best, followed by the sample under vertical magnetic field, which is better than that of the Ni coating prepared without magnetic field. |
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