CORROSION PROTECTION OF ND–FE–B MAGNETS VIA PHOPHATIZATION, SILANIZATION AND ELECTROSTATIC SPRAYING WITH ORGANIC RESIN COMPOSITE COATINGS

Xia Ding (), Jingjie Li (), Musen Li (), Shengsong Ge (), Xiuchun Wang (), Kaihong Ding (), Shengli Cui () and Yongcong Sun ()
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Xia Ding: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, P. R. China
Jingjie Li: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, P. R. China
Musen Li: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, P. R. China
Shengsong Ge: College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, P. R. China
Xiuchun Wang: New Material Institute of Shandong Academy of Sciences, Jinan 250014, P. R. China
Kaihong Ding: Yantai Shougang Magnetic Materials Inc, Yantai 265500, P. R. China
Shengli Cui: Yantai Shougang Magnetic Materials Inc, Yantai 265500, P. R. China
Yongcong Sun: Yantai Shougang Magnetic Materials Inc, Yantai 265500, P. R. China

Surface Review and Letters (SRL), 2014, vol. 21, issue 06, 1-8

Abstract: Nd–Fe–Bpermanent magnets possess excellent properties. However, they are highly sensitive to the attack of corrosive environment. The aim of this work is to improve the corrosion resistance of the magnets by phosphatization, silanization, and electrostatic spraying with organic resin composite coatings. Field emission scanning electron microscope (FE-SEM) and energy dispersive spectrometer (EDS) tests showed that uniform phosphate conversion coatings and spray layers were formed on the surface of theNd–Fe–Bmagnets. Neutral salt spray tests exhibited that, after treated by either phosphating, silanization or electrostatic spraying, the protectiveness ofNd–Fe–Balloys was apparently increased. And corrosion performance of magnets treated with silane only was slightly inferior to those of phosphatized ones. However, significant improvement in corrosion protection was achieved after two-step treatments, i.e. by top-coating spray layer with phosphate or silane films underneath. Grid test indicated that the phosphate and silane coating were strongly attached to the substrate while silane film was slightly weaker than the phosphate-treated ones. Magnetic property analysis revealed phosphatization, silanization, and electrostatic spraying caused decrease in magnetism, but silanization had the relatively smaller effect.

Keywords: Nd–Fe–Bmagnets; phosphatization; silanization; electrostatic spraying; two-step treatments; corrosion resistance; microstructure; magnetic property (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0218625X14500772

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