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Organic-Inorganic Composite Passivation and Corrosion Resistance of Zinc Coated NdFeB Magnets
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2022-11-30 , DOI: 10.1016/j.jallcom.2022.168292
Liangsong Duan, Jing Chen, Pengjie Zhang, Guangqing Xu, Jun Lv, Dongmei Wang, Wangqiang Shen, Yucheng Wu

An organic-inorganic composite passivation of Zn coated NdFeB magnets was carried out using Ce-containing compound and organosilane as source materials. Effects of organosilane content on the microstructure of composite passivation layer were analyzed, and the corrosion resistance and corrosion mechanism of the passivated Zn/NdFeB specimens were deeply studied. Composition, elemental distribution, phase structure and morphology of the specimens were characterized by X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy. The corrosion resistance of the specimens was studied by polarization curves, electrochemical impedance spectroscopy, neutral salt spray text and mass gain test. Results show that adding an appropriate amount of organosilane during the passivating process can form a passivation layer composed of Ce, Si, and O. The optimized Zn(CS-1)/NdFeB achieves the longest NSS time of 840 h, which is twice that of Zn(Ce-5)/NdFeB specimens. Organosilane can build a framework for the passivation layer and make the passivation layer more compact. During the corrosion process, the corrosion medium invasion path is long due to the support of the organosilane frame on the surface, so the corrosion resistance of Zn(CS)/NdFeB is greatly enhanced.



中文翻译:

镀锌钕铁硼磁体的有机-无机复合钝化及耐蚀性能

以含铈化合物和有机硅烷为原料,对镀锌钕铁硼磁体进行了有机-无机复合钝化。分析了有机硅烷含量对复合钝化层微观结构的影响,深入研究了钝化后的Zn/NdFeB试样的耐蚀性能和腐蚀机理。采用X射线光电子能谱、X射线衍射和扫描电子显微镜对样品的组成、元素分布、物相结构和形貌进行了表征。通过极化曲线、电化学阻抗谱、中性盐雾试验和增重试验研究了试件的耐腐蚀性能。结果表明,在钝化过程中加入适量的有机硅烷可以形成由Ce、 h,是 Zn(Ce-5)/NdFeB 样品的两倍。有机硅烷可以为钝化层搭建骨架,使钝化层更加致密。在腐蚀过程中,由于表面有机硅烷骨架的支撑,腐蚀介质的侵入路径较长,从而大大增强了Zn(CS)/NdFeB的耐蚀性。

更新日期:2022-11-30
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