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Corrosion Protection Of Nd–Fe–B Magnets Via Phophatization, Silanization And Electrostatic Spraying With Organic Resin Composite Coatings

Author

Listed:
  • 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)

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.

Suggested Citation

  • Xia Ding & Jingjie Li & Musen Li & Shengsong Ge & Xiuchun Wang & Kaihong Ding & Shengli Cui & Yongcong Sun, 2014. "Corrosion Protection Of Nd–Fe–B Magnets Via Phophatization, Silanization And Electrostatic Spraying With Organic Resin Composite Coatings," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 21(06), pages 1-8.
    • Handle: RePEc:wsi:srlxxx:v:21:y:2014:i:06:n:s0218625x14500772
    DOI: 10.1142/S0218625X14500772
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