Electrodeposition of amorphous Ni-P coatings onto Nd-Fe-B permanent magnet substrates

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	Electrodeposition of amorphous Ni-P coatings onto Nd-Fe-B permanent magnet substrates
	C. B. Ma; F. H. Cao; Z. Zhang; J. Q. Zhang
	2006
发表期刊	Applied Surface Science
ISSN	0169-4332
卷号	253 期号:4 页码:2251-2256
摘要	Decorative and protective Ni-P amorphous coatings were electroplated onto NdFeB permanent magnet from an ortho-phosphorous acid contained bath. The influences of the main electroplating technological parameters including current density, bath pH, bath temperature and H3PO3 on the structure and chemical composition of Ni-P coatings were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques in conjunction with X-ray diffraction (XRD), scanning transmission electron microscopy (SEM) and X-ray energy-dispersive spectrometry (EDX). The optimized amorphous Ni-P coated NdFeB can stand for ca. 180 h against neutral 3.0 wt.% NaCl salt spray without any pitting corrosion. Meanwhile, the results also showed that large phosphorous content is the precondition for Ni-P coatings to possess the amorphous structure, but too much high phosphorous content can damage the amorphous structure due to the separation of superfluous P from Ni2P/Ni3P and the resultant formation of multi-phase coatings (such as Ni2P-P). (c) 2006 Elsevier B.V. All rights reserved.
部门归属	zhejiang univ, dept chem, hangzhou 310027, peoples r china. chinese acad sci, met res inst, state key lab corros & protect met, shenyang 110016, peoples r china.;zhang, z (reprint author), zhejiang univ, dept chem, yuquan campus, hangzhou 310027, peoples r china;eaglezzy@zjuem.zju.edu.cn
关键词	Nd-fe-b Amorphous Ni-p Electrodeposition Potentiodynamic Polatization Eis Ndfeb Magnets Corrosion-resistance Phosphorus Incorporation Surface-coatings Alloys Protection Performance Mechanism
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WOS记录号	WOS:000243244200094
引用统计	被引频次：64[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34390
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. B. Ma,F. H. Cao,Z. Zhang,et al. Electrodeposition of amorphous Ni-P coatings onto Nd-Fe-B permanent magnet substrates[J]. Applied Surface Science,2006,253(4):2251-2256.
APA	C. B. Ma,F. H. Cao,Z. Zhang,&J. Q. Zhang.(2006).Electrodeposition of amorphous Ni-P coatings onto Nd-Fe-B permanent magnet substrates.Applied Surface Science,253(4),2251-2256.
MLA	C. B. Ma,et al."Electrodeposition of amorphous Ni-P coatings onto Nd-Fe-B permanent magnet substrates".Applied Surface Science 253.4(2006):2251-2256.