粘结NdFeB磁体腐蚀行为及机理研究
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摘要
作为一种高磁能积永磁材料,粘结NdFeB磁体在航空航天、核工业、交通运输等多个领域得到广泛应用,其原材料是NdFeB快淬粉。由于NdFeB与空气接触极易发生腐蚀,为保证粘结NdFeB磁体的可靠性和寿命,针对防护处理后的带腐蚀损伤缺陷磁体的腐蚀行为进行研究,发现带有腐蚀损伤缺陷的磁体即使在经过可靠的防护处理后,在恶劣环境下腐蚀依然会继续扩展;不同损伤程度的磁体防护后的腐蚀快慢速度不同,随着腐蚀时间延长,先前的腐蚀产物Fe2O3与水反应生成H2,加速了损伤磁体的腐蚀。
As a permanent magnet material with high magnetic energy product,bonded NdFeB magnets have been widely used in aerospace,nuclear industry,transportation and other fields. Its raw material is NdFeB rapid quenching powder. The NdFeB magnets are easy to corrode in air environment,in order to ensure the reliability and life of bonded NdFeB magnets,the corrosion behavior of magnets with corrosion defect after protective treatment was studied. It is found that the corrosion grows continually and the magnetic performance decreases even though the magnet has reliable coating protection. The corrosion rates of magnets with different damage degrees are different. With the increase of corrosion time,the previous corrosion product Fe2 O3 reacts with water to produce H2,accelerating the corrosion of damaged magnets.
As a permanent magnet material with high magnetic energy product,bonded NdFeB magnets have been widely used in aerospace,nuclear industry,transportation and other fields. Its raw material is NdFeB rapid quenching powder. The NdFeB magnets are easy to corrode in air environment,in order to ensure the reliability and life of bonded NdFeB magnets,the corrosion behavior of magnets with corrosion defect after protective treatment was studied. It is found that the corrosion grows continually and the magnetic performance decreases even though the magnet has reliable coating protection. The corrosion rates of magnets with different damage degrees are different. With the increase of corrosion time,the previous corrosion product Fe2 O3 reacts with water to produce H2,accelerating the corrosion of damaged magnets.
引文
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[2]于濂清,黄翠翠,袁永锋. B含量对高能积磁体磁性能和耐蚀性的影响[J].粉末冶金工业,2008,18(5):16.
[3] Tenaud P,Vial F,Sagawa M. Improved corrosion and temperature behaviour of modified Nd-Fe-B magnets[J]. IEEE Transactions on Magnetics,1990,26(5):1930.
[4]李瑞春,惠英林.钕铁硼烧结磁体失重问题探讨[J].金属功能材料,2011,18(1):52.
[5]吴亚萍,朱明刚,石晓宁,等.(Ce20Nd80)31FebalB1M磁体腐蚀产物多样性的研究[J].粉末冶金工业,2017,27(5):36.
[6]祝景汉.快淬钕铁硼永磁合金及粘结磁体[J].粉末冶金工业,2000,10(1):40.
[7]周维娜,李文学,王玉峰,等.快淬NdFeB粘结磁体制备工艺及其对磁性能的影响[J].金属功能材料,2005,12(6):1.
[8] Bala H,Trepak N M. Corrosion protection of NdFeB type permanent magnets by zinc phosphate surface conversion coatings[J]. Intermetallics,2001(9):515.
[9]周革.三相烧结工艺对NdFeB磁体结构与性能的影响[J].金属功能材料,2010,17(3):1.
[10] Yoshio Kato. Thermal stability of sintered and bonded rareearth magnets[J]. Journal of Applied physics,1999,85(8):4868.
[11] Takeuchi S M T,Azambuja D S,Costa I. Cerium conversion layer for improving the corrosion resistance of phosphated NdFeB magnets[J]. Surface&Coatings Technology,2006,201(6):3670.
[12]于濂清,黄翠,袁永锋. B含量对高能积磁体磁性能和耐蚀性的影响[J].粉末冶金工业,2008,18(5):16.