Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 495, Issue 1, Pages 189-195Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.01.117
Keywords
NdFeB permanent magnet; Zn-TiO2; Corrosion protection; Sealing
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Funding
- Natural Science Foundation of Chongqing, China [2005884055]
- Southwest Normal University [XSGX06]
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In this paper, a protective sealed Zn-TiO2 composite coating (SCC) was prepared on sintered NdFeB magnet by electrodeposition and sol-gel combined technique. For a comparison, unsealed Zn-TiO2 composite coating (UCC) was also studied. The surface morphologies of composite coating were studied using scanning electron microscope (SEM). The microstructure of composite coatings and structure of sealing layer were studied by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectrum, respectively. The anticorrosive properties of composite coatings in neutral 3.5 wt.% NaCl solutions were evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) technique. The results of corrosion tests showed that due to the blocking effect of sealing layer. SCC could suppress the corrosion process by holding back the transfer or diffusion of corrosive medium, and therefore showed the excellent corrosion protection properties for sintered NdFeB magnet. (C) 2010 Elsevier B.V. All rights reserved.
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