Comparison of the corrosion resistances of chromium-passivated and cerium-passivated Zn/NdFeB magnets

IF 2.7 4区材料科学 Q3 ELECTROCHEMISTRY Corrosion Reviews Pub Date : 2023-01-09 DOI:10.1515/corrrev-2022-0014

Pengjie Zhang, Jing-Bo Chen, Hongyi Yang, Guangqing Xu, Jun Lv, J. Cui, Wei Sun, Bingshan Li, Dongmei Wang, Yucheng Wu

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Abstract

Abstract Chromium-free passivation of Zn coating on NdFeB magnets becomes a research hotspot due to the serious harm of chromium ions to the human body. Chromium-based and cerium-based passivation technologies are conducted on electroplating Zn/NdFeB respectively. Morphologies, elemental compositions and phase structures of the two passivated coatings are characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The corrosion resistances of the two passivated specimens are compared by neutral salt spray test, accelerated aging test and electrochemical measurements. A complete and smooth passivation film can be obtained on the surface of Zn/NdFeB, filling the gaps and pores in Zn coating. Compared with un-passivated Zn/NdFeB, Zn(Ce)/NdFeB and Zn(Cr)/NdFeB possess excellent corrosion resistance. In comparison, Zn(Ce)/NdFeB possesses excellent anti-corrosion performance, increasing the red-rust appearing time from 288 to 432 h, which is still lower than that of Zn(Cr)/NdFeB (528 h). Therefore, the self-repair effect of cerium passivation technology during the corrosion process should be further studied to achieve the purpose of replacing chromium passivation technology.

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铬钝化与铈钝化Zn/NdFeB磁体耐蚀性能的比较

摘要由于铬离子对人体的严重危害，钕铁硼磁体表面锌涂层的无铬钝化成为研究热点。分别对电镀Zn/NdFeB进行了铬基和铈基钝化工艺。用扫描电镜、x射线衍射和x射线光电子能谱对两种钝化膜的形貌、元素组成和相结构进行了表征。通过中性盐雾试验、加速老化试验和电化学测试对两种钝化试样的耐蚀性进行了比较。在锌/钕铁硼表面形成完整、光滑的钝化膜，填充了锌涂层中的空隙和孔隙。与未钝化的Zn/NdFeB相比，Zn(Ce)/NdFeB和Zn(Cr)/NdFeB具有优异的耐蚀性。相比之下，Zn(Ce)/NdFeB具有优异的防腐性能，其红锈出现时间从288 h增加到432 h，仍低于Zn(Cr)/NdFeB的528 h，因此，应进一步研究铈钝化技术在腐蚀过程中的自修复效果，以达到取代铬钝化技术的目的。

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来源期刊

Corrosion Reviews 工程技术-材料科学：膜

CiteScore

5.20

自引率

3.10%

发文量

审稿时长

4.5 months

期刊介绍： Corrosion Reviews is an international bimonthly journal devoted to critical reviews and, to a lesser extent, outstanding original articles that are key to advancing the understanding and application of corrosion science and engineering in the service of society. Papers may be of a theoretical, experimental or practical nature, provided that they make a significant contribution to knowledge in the field.