Fast Electrodeposition of Amorphous Ni-P/Al<sub>2</sub>O<sub>3</sub> Composite Coatings Deposited by Bi-directional Pulse
The amorphous Ni-P/Al<sub>2</sub>O<sub>3</sub> composite coatings with high P content were deposited using the bi-directional pulse electrodeposition. The micrographic morphology and chemical composition of the coatings were examined using the scanning electron microscope (SE...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2018-03-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/Y2018/V46/I3/81 |
| Summary: | The amorphous Ni-P/Al<sub>2</sub>O<sub>3</sub> composite coatings with high P content were deposited using the bi-directional pulse electrodeposition. The micrographic morphology and chemical composition of the coatings were examined using the scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) analysis. Also, the phase structure of the coating was characterized using the X-ray diffraction (XRD). By analyzing the electrochemical test results of the coatings, the corrosion resistances of different types of deposits were evaluated. The results show that compared to the direct current (DC) plating, the P content in the Ni-P alloy coatings increases to 12.06%(mass fraction) by bi-directional pulse electrodeposition, which facilitates the formation of the amorphous Ni-P alloy coatings. The PC plating can produce a finer and denser Ni-P/Al<sub>2</sub>O<sub>3</sub> composite coatings with more compact crystallization than that deposited by DC. The Ni-P alloy coatings deposited by the pulse electrodeposition has a better corrosion resistance, and adding composite particles of Al<sub>2</sub>O<sub>3</sub> can further contribute to improving the corrosion resistance of the amorphous Ni-P alloy coatings. |
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| ISSN: | 1001-4381 1001-4381 |