Preparation and Properties of ZnAl-EP Coating for Bonded NdFeB with High Corrosion Resistance

被引：0
|
作者：
Yang Y. [1 ]
Chen Y. [1 ]
Jiang N. [1 ]
Wang Y. [1 ]
Yang L. [1 ]
Fang X. [1 ]
Liu J. [1 ]
机构：
[1] School of Materials Science and Engineering, Hefei University of Technology, Hefei
来源：
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | 2023年 / 41卷 / 04期
关键词：
bonded NdFeB; corrosion mechanism; corrosion resistance; ZnAl-EP composite coating;
D O I：
10.11785/S1000-4343.20230411
中图分类号：
学科分类号：
摘要：
ZnAl/epoxy resin（ZnAl-EP）composite coating was prepared on the surface of the ring-shaped bonded NdFeB magnets（RSM）for the first time by atomization spraying . The surface morphology and chemical composition of the composite coating were characterized by a scanning electron microscope（SEM）with energy dispersive spectroscopy（EDS）and a 3D laser confocal scanning microscope. The corrosion resistance of ZnAl-EP composite coating was analyzed by means of polarization curve and neutral salt spray test，and the corrosion mechanism was studied. It is found out that the epoxy resin in ZnAl-EP composite coating penetrates into the pores of ZnAl coating and plays a good sealing role. Compared with ZnAl/RSM and EP/RSM，the self-corrosion current density of ZnAl-EP/RSM in 3.5% NaCl solution is reduced by 2-3 orders of magnitude. And the neutral salt spray resistance test time of ZnAl-EP/RSM reaches 1800 h，which is 6~7 times higher than that of single ZnAl coating and 4 times higher than that of single epoxy resin coating，reflecting the superior anti-corrosion performance of ZnAl-EP composite coating. © 2023 Chinese Society of Rare Earths. All rights reserved.
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页码：748 / 756
页数：8
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