| MA Zhi,CHEN Huan-ming,PAN Feng-chun,XI Li-ying,LIN Xue-ling,WANG Qin,LYU Qiong.Preparation of Oxide Particles Enhanced Ni-W-P / Nb2O5 Composite Coatings by Electroless Plating and Its Corrosion Resistance[J],44(10):16-21,39 |
| Preparation of Oxide Particles Enhanced Ni-W-P / Nb2O5 Composite Coatings by Electroless Plating and Its Corrosion Resistance |
| Received:July 03, 2015 Revised:October 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.10.003 |
| KeyWord:electroless plating Ni-W-P / Nb2 O5 composite coating corrosion resistance NdFeB particle enhancement codeposition |
| Author | Institution |
| MA Zhi |
School of Physics & Electrical Information Engineering, Ningxia University, Yinchuan , China |
| CHEN Huan-ming |
School of Physics & Electrical Information Engineering, Ningxia University, Yinchuan , China |
| PAN Feng-chun |
School of Physics & Electrical Information Engineering, Ningxia University, Yinchuan , China |
| XI Li-ying |
School of Physics & Electrical Information Engineering, Ningxia University, Yinchuan , China |
| LIN Xue-ling |
School of Physics & Electrical Information Engineering, Ningxia University, Yinchuan , China |
| WANG Qin |
School of Physics & Electrical Information Engineering, Ningxia University, Yinchuan , China |
| LYU Qiong |
School of Physics & Electrical Information Engineering, Ningxia University, Yinchuan , China |
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| Abstract: |
| Objective To protect the surface of NdFeB permanent magnetic materials and improve its corrosion resistance. Methods The oxide particles enhanced crystalline and amorphous Ni-W-P/ Nb2O5 composite coatings were deposited on the NdFeB substrate using electroless plating, respectively. The microstructure, chemical elements distribution and the existed phases of the coatings were analyzed. The corrosion resistance of the composite coatings was also evaluated using weight loss experiments. Results The crystalline and amorphous composite coatings were formed correspondingly while the mass concentration of NaH2PO2· H2 O was 20 g / L and 35 g / L, respectively. The dissimilar Nb2 O5 particles were dispersed inside the crystalline and amorphous Ni-W-P / Nb2 O5 composite coatings which showed closely nodules structure. The XRD patterns of the coatings indicated that there was no diffraction peak related to the NdFeB substrate. When the Nb2 O5 mass concentration was increased from 5 to 15 g / L, the corrosion rate of the crystalline and amorphous coatings formed decreased markedly, whereas the corrosion rate of the coatings decreased tardily when the Nb2 O5 mass concentration was increased from 15 to 20 g / L. Conclusion The consolidated Nb2 O5 particles enhanced Ni-W-P / Nb2 O5 composite coatings could be prepared by electroless plating. And its corrosion resistance was improved with increasing Nb2 O5 concentration. |
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