Corrosion behavior of sintered CeNdFeB magnets in different solutions
Corrosion behavior of sintered CeNdFeB magnets in different solutions
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DOI：
10.1016/j.jallcom.2017.01.347
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发表时间：
2017-05-05
影响因子：
6.2
通讯作者：
Song, Zhenlun
中科院分区：
文献类型：
--
作者：
Bi, Mengxue;Xu, Cheng;Song, Zhenlun
CeNdFeB 作为 NdFeB 替代品的能力因其成本效益和迷人的磁性而引起了人们的极大兴趣。在本文中，我们系统地研究了烧结 CeNdFeB 磁体在碱性和酸性介质中的腐蚀行为，以评估其商业可行性。使用不同含量的 Ce（0.0 wt%、29.6 wt%、44.6 wt%、54.8 wt%）替代 Nd 的烧结 CeNdFeB 磁体在不同浓度的氢氧化钠（NaOH）、硝酸（HNO3）、盐酸（HCl）、硫酸（H2SO4）和草酸中进行电化学和浸泡测试（H2C2O4）。我们发现，与烧结 NdFeB 磁体相比，烧结 CeNdFeB 磁体表现出钝化行为，并且在 NaOH 和 H2C2O4 溶液中腐蚀速率降低。当暴露在强酸中时，烧结CeNdFeB在HNO3溶液中的耐腐蚀性能与烧结NdFeB相当，而在HCl和H2SO4溶液中的耐腐蚀性能较低。 (C) 2017 Elsevier B.V. 保留所有权利。
The capability of CeNdFeB as a substitute for NdFeB is of considerable interest due to its cost effectiveness and fascinating magnetic properties. In this paper, we have systematically investigated the corrosion behavior of the sintered CeNdFeB magnets in alkaline and acidic media in order to evaluate their commercial viability. Electrochemical and immersion tests have been conducted using sintered CeNdFeB magnets with different amounts of Ce (0.0 wt%, 29.6 wt%, 44.6 wt%, 54.8 wt%) as substitution of Nd in different concentrations of sodium hydroxide (NaOH), nitric acid (HNO3), hydrochloric acid (HCl), sulfuric acid (H2SO4), and oxalic acid (H2C2O4). We have found that the sintered CeNdFeB magnets exhibit passive behavior and the corrosion rate decreases in NaOH and H2C2O4 solutions by comparison with sintered NdFeB magnets. When exposed in strong acids, the sintered CeNdFeB has comparable corrosion properties with sintered NdFeB in HNO3 solution and lower anticorrosion properties in HCl and H2SO4 solutions. (C) 2017 Elsevier B.V. All rights reserved.