PREPARATION AND CHARACTERIZATION OF ELECTROLESS Ni COATING ON THE SURFACE OF MgO WITH POROUS STRUCTURE

LI Jun-Meng; JIANG Bai-Ling; SA Hui; XUE Xiao-Nan

doi:10.3724/SP.J.1037.2010.00055

Acta Metall Sin >

2010 , Vol. 46 >Issue 9: 1103 - 1108

DOI: https://doi.org/10.3724/SP.J.1037.2010.00055

论文

PREPARATION AND CHARACTERIZATION OF ELECTROLESS Ni COATING ON THE SURFACE OF MgO WITH POROUS STRUCTURE

LI Jun-Meng ,
JIANG Bai-Ling ,
SA Hui ,
XUE Xiao-Nan

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1) School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048
2) MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi'an Jiaotong University, Xi'an 710049

Received date: 2010-01-28

Revised date: 2010-06-02

Online published: 2010-09-11

Supported by

Supported by Major International Joint Research Program of China (No.2007DFB50150) and Shaanxi Provincial Project of Special Foundation of Key Disciplines

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Abstract

Generally, the surface pretreatments such as sensitization and activation are necessary for depositing a nickel metal layer on oxide surface by electroless plating, however, for an oxide surface with porous structure it is possible that the pretreatment is not necessary. In this paper, only by use of the surface activity of porous structure, an electroless plated nickel layer can be prepared on the surface of microarc-oxidation-fabricated porous magnesium oxide film in a conventional electroless nickel plating solution, consisted of nickel sulfate as main salt and sodium hypophosphite as reducing agent. Furthermore, the phase, microstructure, electrical conductivity and corrosion resistance of the obtained nickel layer were characterized. The results indicate that the 5 μm-thick nickel layer is composed of fine and homogeneously distributed nickel particles, at the same time the microstructure of nickel layer is dense. Nickel layer spreads into the micropores on the surface of porous magnesium oxide film, so that an interleaving interface is formed at nickel/oxide interface. XRD results reveal that the nickel layer contains crystalline Ni and amorphous Ni-P. Four-point probe measurement indicates that the nickel layer exhibits well electrical conductivity. Meanwhile, polarization curve reveals that corrosion potential elevates notably due to the presence of nickel layer. During electroless nickel plating the nickel ions in solution were reduced and deposited in the micropores of porous magnesium oxide film under the action of reducing agent ions, so as to generate tiny primary nickel particles, subsequently, these primary nickel particles continuously grew and spread, and finally formed an entire nickel layer on oxide surface.

Key words： electroless nickel plating; MgO; porous structure; electrical conductivity; corrosion potential

Cite this article

LI Jun-Meng , JIANG Bai-Ling , SA Hui , XUE Xiao-Nan . PREPARATION AND CHARACTERIZATION OF ELECTROLESS Ni COATING ON THE SURFACE OF MgO WITH POROUS STRUCTURE[J]. Acta Metall Sin, 2010 , 46(9) : 1103 -1108 . DOI: 10.3724/SP.J.1037.2010.00055

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