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| 前处理工艺对NdFeB表面真空蒸镀Al薄膜结构及性能的影响 |
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张鹏杰1,2,3, 吴玉程1, 曹玉杰4,2, 徐光青1, 刘家琴4, 衣晓飞1,2,3, 陈静武2,3
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1.合肥工业大学材料科学与工程学院, 合肥 230009;2.稀土永磁材料国家重点实验室, 合肥 231500;3.安徽大地熊新材料股份有限公司, 合肥 231500;4.合肥工业大学工业与装备技术研究院, 合肥 230009
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| 摘要: |
| 为了开发烧结钕铁硼磁体表面低损伤、环境友好型镀膜前处理工艺，在分别采用抛光、酸洗（50 s）、吹砂、吹砂+酸洗（5 s）4种不同工艺处理的烧结NdFeB磁体表面真空蒸镀Al薄膜。经不同工艺前处理的NdFeB基体和涂层的形貌采用扫描电子显微镜进行观察；采用拉伸试验对Al涂层和基体之间的结合力进行测试；NdFeB基体的自腐蚀行为采用电化学极化曲线进行表征。结果表明：吹砂前处理后NdFeB基体表面存在一层晶粒损伤层，导致镀Al薄膜试样镀层与基体之间的结合力（9.54 MPa）最差。而采用吹砂+酸洗（5 s）前处理后NdFeB表面镀Al试样镀层与基体之间结合力可达13.58 MPa。酸洗（50 s）及喷砂+酸洗（5 s）前处理后基体试样的自腐蚀电流密度基本相同（21 μA·cm-2），仅为抛光及喷砂前处理基体试样的20%。在4种工艺当中，吹砂+酸洗（5 s）前处理工艺获得最高的结合力和优异的耐腐蚀性能。 |
| 关键词: 烧结NdFeB磁体 前处理工艺 真空蒸镀 耐腐蚀性能 |
| DOI：10.11933/j.issn.1007-9289.2016.04.007 |
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| 基金项目:安徽省自然科学基金（1408085MKL72，1408085MKL73） |
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| Effects of Pretreatment Technologies on Structure and Properties of Al Coatings on Sintered NdFeB Substrates via Vacuum Evaporation |
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ZHANG Peng-jie1,2,3, WU Yu-cheng1, CAO Yu-jie4,2, XU Guang-qing1, LIU Jia-qin4, YI Xiao-fei1,2,3, CHEN Jing-Wu2,3
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1.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009;2.State Key Laboratory of Rare Earth Permanent Magnet Materials, Hefei 231500;3.EarthPanda Advance Magnetic Material Co. Ltd., Hefei 231500;4.Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei 230009
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| Abstract: |
| In order to develop low damage, environment-friendly pretreatment technology for sintered NdFeB magnet, Al coatings were prepared on sintered NdFeB magnets via evaporation method with four different pretreatment technologies of polishing, pickling (50 s), sandblasting and sandblasting+pickling (5 s). Morphologies of the NdFeB substrates and coatings with different pretreatment technologies were observed with SEM. The tensile test was performed to measure the adhesive strength between Al coating and NdFeB substrate. The self-corrosion behavior of the NdFeB specimen was characterized by potentiodynamic polarization curves. The results reveal that a grain damaged layer produces on the surface of the NdFeB substrate after sandblasting, resulting in the lowest adhesive strength (9.54 MPa) between Al coating and NdFeB substrate. However, the adhesive strength of the specimens pretreated with combined technology of sandblasting and pickling (5 s) achieves 13.58 MPa. In terms of the corrosion current density, the Al coated specimens with pickling (50 s) and the combined technology of sandblasting and pickling (5 s) are both approximately 21 μA·cm-2, 20% of the NdFeB magnets treated with polishing and sandblasting. Among the four technologies, the combined pretreatment technology of sandblasting and pickling (5 s) achieves the highest adhesive strength and demonstrates excellent anticorrosion properties. |
| Key words: sintered NdFeB magnet pretreatment technology vacuum evaporation anticorrosion properties |