Influence of dysprosium addition on corrosion behavior of NdFeB magnets

IF 2.3 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials Pub Date : 2024-08-28 DOI:10.1108/acmm-05-2024-3016

Jiandong Yang, Zhiqiang Li, Hongbo Hao, Jinxu Li

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引用次数: 0

Abstract

Purpose

This paper aims to investigate the corrosion kinetics and corrosion behavior of NdFeB magnets with the addition of heavy rare earth dysprosium (Dy) for its inhibitory activity on poor corrosion resistance of NdFeB magnets.

Design/methodology/approach

To study the effect of dysprosium addition on corrosion behavior of NdFeB magnets and investigate its mechanism, potentiodynamic polarization, scanning electron microscopy (SEM), electrochemical impedance, energy dispersion spectrum (EDS) and scanning Kelvin probe force microscopy (SKPFM) were applied in the research. Besides, microstructures were observed by SEM equipped with EDS. Atomic force microscopy was introduced to analyze the morphology, potential image as well as the contact potential difference. The SKPFM mapping scan was applied to obtain the contact potential around Nd-rich phase at 0.1 Hz. The magnets were detected via X-ray diffraction.

Findings

Substitution of Nd with Dy led to improvement of corrosion resistance and reduced the potential difference between matrix and Nd-rich phase. Corrosion resistance is Nd-rich phase < the void < metal matrix; maximum potential difference between matrix and Nd-rich phase of Dy = 0, Dy = 3 and Dy = 6 Wt.% is 411.3, 279.4 and 255.8 mV, respectively. The corrosion rate of NdFeB magnet with 6 Wt.% Dy is about 67% of that without Dy at steady corrosion stage. The addition of Dy markedly enhanced the corrosion resistance of NdFeB magnets.

Originality/value

This research innovatively investigates the effect of adding heavy rare earth Dy to NdFeB permanent magnets on magnetic properties, as well as their effects on microstructure, phase structure and most importantly on corrosion resistance. Most scholars are studying the effect of element addition on magnetic properties but not on corrosion resistance. This paper creatively fills this research gap. NdFeB magnets are applied in smart cars, robotics, AI intelligence, etc. The in-depth research on corrosion resistance by adding heavy rare earths has made significant and outstanding contributions to promoting the rapid development of the rare earth industry.

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添加镝对钕铁硼磁体腐蚀行为的影响

目的本文旨在研究添加重稀土镝（Dy）对耐腐蚀性差的钕铁硼磁体的腐蚀动力学和腐蚀行为的影响。为了研究添加镝对钕铁硼磁体腐蚀行为的影响并探究其机理，研究中采用了电位极化、扫描电子显微镜（SEM）、电化学阻抗、能量色散谱（EDS）和扫描开尔文探针力显微镜（SKPFM）。此外，还利用配备 EDS 的扫描电镜观察了微观结构。原子力显微镜用于分析形态、电位图像和接触电位差。应用 SKPFM 映射扫描，以 0.1 Hz 频率获得富钕相周围的接触电势。研究结果用 Dy 替代 Nd 提高了耐腐蚀性，减少了基体和富钕相之间的电位差。Dy = 0、Dy = 3 和 Dy = 6 Wt.% 时，富钕相与金属基体之间的最大电位差分别为 411.3、279.4 和 255.8 mV。在稳定腐蚀阶段，添加 6 重量百分比 Dy 的钕铁硼磁体的腐蚀速率约为不添加 Dy 时的 67%。本研究创新性地探讨了在钕铁硼永磁体中添加重稀土 Dy 对磁性能的影响，以及对微观结构、相结构和最重要的耐腐蚀性的影响。大多数学者都在研究添加元素对磁性能的影响，但没有研究对耐腐蚀性的影响。本文创造性地填补了这一研究空白。钕铁硼磁体应用于智能汽车、机器人、人工智能等领域。通过添加重稀土对耐腐蚀性能的深入研究，为推动稀土产业的快速发展做出了重要而突出的贡献。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Anti-corrosion Methods and Materials 工程技术-冶金工程

CiteScore

2.80

自引率

16.70%

发文量

审稿时长

13.5 months

期刊介绍： Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.