Ni-P化学镀层对NdFeB永磁材料耐腐蚀性的改善
Effect of Electroless Ni-P Plating on Corrosion Resistance of NdFeB Magnets
摘 要
测量了不同类型Ni-P化学镀试样和基体的孔隙率,以及在HCl、NaCl和NaOH溶液中的腐蚀速率,比较了不同类型Ni-P化学镀试样在3.5%NaCl 溶液中的极化曲线,对比分析了酸性和酸碱复合条件下所得Ni-P镀层的表面形貌.结果表明:化学镀Ni-P合金能显著改善NdFeB永磁体的耐腐蚀性和致密性,且以弱碱性化学镀为底层,酸性化学镀为表层的酸碱复合镀层的致密性和耐腐蚀性最佳,单一酸性镀层的耐腐蚀性又优于碱性镀层.
稀土
NdFeB永磁体
耐腐蚀性
孔隙率
Ni-P plating
rare earth
NdFeB permanent magnet
corrosion resistance
porosity
Abstract
The porosity of different types of Ni-P deposits and substrate were measured and the corrosion rates were studied in 3.5% NaCl,10% HCl and 20% NaOH solutions.The corrosion characteristics of different types of Ni-P deposites in 3.5% NaCl solution were envaluated by electrochemical potentiodynamic polarization curves.The microstructure of electroless Ni-P deposits in acidic and acidic-alkaline compositing baths were compared.The results showed that all the types of deposits could enhance the densification and corrosion resistance of substrate.The acidic-alkaline composite deposits composed of alkaline Ni-P plating as bottom film and acidic Ni-P plating as top film could provide the best protection,and the corrosion resistance of single acidic Ni-P deposit was better than that of single alkaline Ni-P deposit.
中图分类号 TG174.4
所属栏目 试验研究
基金项目 安徽省教育厅自然科学基金(kJ2009B050)
收稿日期 2008/11/11
修改稿日期 2009/2/10
网络出版日期
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备注冒爱琴,讲师.
引用该论文: MAO Ai-qin,SHA Fei. Effect of Electroless Ni-P Plating on Corrosion Resistance of NdFeB Magnets[J]. Corrosion & Protection, 2009, 30(12): 896～898
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参考文献
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【2】Gurrappa I,Pandian S.Corrosion characteristics of Nd-Fe-B permanent magnets in different environments[J].Corrosion Engineering,Science & Technology,2006,41(1):57-61.
【3】Yu L Q,Wen Y H,Yan M.Effects of Dy and Nb on the magnetic properties and corrosion resistance of sintered NdFeB[J].Journal of Magnetism& Magnetic Materials,2004,283 (2/3):353-356.
【4】Li Y,Evans H E,Harris I R,et al.The oxidation of NdFeB magnets[J].Oxid.Mel.,2003,59:167-182.
【5】El-Moneim A A,Gebert A,Uhlemann M,et al.The influence of Co and Ga additions on the corrosion behavior of nanocrystalline NdFeB magnets[J].Corrosion Science,2002,44(8):1857-1875.
【6】Ma C B,Cao F H,Zhang Z,et al.Electrodeposition of amorphous Ni-P coatings onto Nd-Fe-B permanent magnet substrates[J].Applied Surface Science,2006,253(4):2251-2256.
【7】Yu Shengxue,Chen Ling.Preparation technology and performances of Zn-Cr coating on sintered NdFeB permanent magnet[J].Journal of Rare Earths,2006,24(2): 223-226.
【8】Shan Guan,Bradley J Nelson.Fabrication of hard magnetic microarrays by electroless codeposition for MEMS actuators[J].Sensors and Actuators A: Physical,2005,118(2):307-312.
【9】Rada M,Kardelky S,Mazilu I,et al.Corrosion behavior of polymer-bonded NdFeB-based nanocrystalline magnets[J].IEEE Transactions on Magnetics,2004,40(4):2864-2866.
【10】张天顺,张兆国,张晶秋,等.TL-5化学镀Ni-P合金在NdFeB永磁体上的工艺研究[J].腐蚀与防护,2002,23(4):152-154.
【11】吴磊,严密,应华根,等.NdFeB磁体表面化学镀Ni-P合金防腐研究[J].稀有金属材料与工程,2007,36(8):1398-1402.
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