烧结NdFeB表面Zn-Al涂层制备及耐腐蚀机理研究

doi:10.11902/1005.4537.2022.003

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 104-110 CSTR: 32134.14.1005.4537.2022.003 DOI: 10.11902/1005.4537.2022.003

研究报告

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烧结NdFeB表面Zn-Al涂层制备及耐腐蚀机理研究

江杰¹^,², 姜建军², 杨丽景², 雷步芳¹, 赵宇³, 林建强⁴, 宋振纶²(

)

^1.太原科技大学材料科学与工程学院太原 030024
^2.中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室浙江省海洋材料与防护技术重点实验室宁波 315201
^3.杭州永磁集团有限公司宁波 311231
^4.宁波招宝磁业有限公司宁波 315299

Preparation and Corrosion Resistance of Zn-Al Coating on Sintered NdFeB Permanent Magnet

JIANG Jie¹^,², JIANG Jianjun², YANG Lijing², LEI Bufang¹, ZHAO Yu³, LIN Jianqiang⁴, SONG Zhenlun²(

)

^1.School of Materials Science and Engineering, Taiyuan University of science and Technology, Taiyuan 030024, China
^2.Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
^3.Hangzhou Permanent Magnet Group Co. Ltd., Ningbo 311231, China
^4.Ningbo Zhaobao Magnetic Industry Co. Ltd., Ningbo 315299, China

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摘要:

在烧结钕铁硼永磁试样表面制备了无铬锌铝烧结涂层，并确定了工艺参数。利用扫描电子显微镜 (SEM)、能谱仪 (EDS)、X射线衍射仪 (XRD)、Fourier变换红外光谱 (FTIR)、热重分析和差热综合热分析仪 (TG-DTA) 对涂层的形貌、组成和形成机理进行了观察和研究。讨论了涂层耐腐蚀机制及其对磁体磁性能的影响。结果表明：Zn-Al涂层均匀地涂覆于NdFeB磁体表面，涂层厚度约为27 µm，耐中性盐雾实验能力高达1000 h以上，对NdFeB基体起到阴极保护作用和物理屏蔽功能。

关键词 ：无铬Zn-Al涂层, 微观形貌, 硅烷, 耐蚀性, 稀土

Abstract：

A Cr-free Zn-Al coating was prepared via a two-step process, namely spraying Zn-Al paste and subsequently baking, on the surface of sintered Nd-Fe-B permanent magnet, and which was further examined by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, and differential thermal comprehensive thermal analyzer (TG-DTA) in terms of its morphology, composition, and formation mechanism of the coating. The corrosion behavior of the coated Nd-Fe-B magnet was studied via immersion testing in 3.5%NaCl solution, and neutral salt spray testing. The results show that Zn-Al coating is uniformly coated on the surface of the NdFeB magnet, the coating thickness is about 27 µm, while, its corrosion resistance to neutral salt spray testing is higher than 1000 h; In other word, the Cr-free Zn-Al coating can provide excellent cathodic protection and physical barrier for NdFeB permanent magnet.

Key words： chromium-free Zn-Al coating micromorphology silane corrosion resistance rare earth

收稿日期: 2022-01-01 32134.14.1005.4537.2022.003

ZTFLH:

TG174

基金资助:国家重点研发计划(2021YFB3502902);宁波市重点技术研发项目(2021Z024)

作者简介: 江杰，男，1996年生，硕士生

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引用本文:

江杰, 姜建军, 杨丽景, 雷步芳, 赵宇, 林建强, 宋振纶. 烧结NdFeB表面Zn-Al涂层制备及耐腐蚀机理研究[J]. 中国腐蚀与防护学报, 2023, 43(1): 104-110.
Jie JIANG, Jianjun JIANG, Lijing YANG, Bufang LEI, Yu ZHAO, Jianqiang LIN, Zhenlun SONG. Preparation and Corrosion Resistance of Zn-Al Coating on Sintered NdFeB Permanent Magnet. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 104-110.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.003 或 https://www.jcscp.org/CN/Y2023/V43/I1/104

图1 表面形貌和元素分布图

图2 Zn-Al涂层的截面形貌、截面EDS谱及XRD谱

图3 KH-560硅烷水解溶液的红外光谱图

图4 Zn-Al涂层的热重曲线

图5 Zn-Al涂层样品在NSS溶液中不同时间腐蚀后的形貌

图6 Zn-Al涂层样品在20%NH4NO3溶液中不同时间腐蚀后的形貌

图7 Zn-Al涂层在20%NH4NO3溶液中不同腐蚀时间的XRD谱

图8 样品在20%NH4NO3溶液中浸泡不同时间后的极化曲线

表1 样品在20%NH4NO3溶液中浸泡不同时间后的电化学测试结果

图9 样品在20%NH4NO3溶液中浸泡不同时间后的Nyquist图和bode图

图10 原始样品、300 ℃热处理样品和Zn-Al涂层样品磁性能

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