| LIU Ji-yun,ZHAO Yang,DONG Shi-yun,XU Bin-shi.Ni-Co Alloy Coatings Prepared by Pulse Brush Electroplating and Their Microhardness[J],47(1):218-223 |
| Ni-Co Alloy Coatings Prepared by Pulse Brush Electroplating and Their Microhardness |
| Received:August 15, 2017 Revised:January 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.01.034 |
| KeyWord:brush plating microhardness Ni-Co alloy voltage frequency duty ratio MoS2 |
| Author | Institution |
| LIU Ji-yun |
National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing , China |
| ZHAO Yang |
National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing , China |
| DONG Shi-yun |
National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing , China |
| XU Bin-shi |
National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing , China |
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| Abstract: |
| The work aims to optimize pulse parameters and prepare brush-plated Ni-Co alloy coatings of high microhardness. Brush plated Ni-Co alloy coatings were prepared with pulsed power supply, and effects of CoSO4 concentration, voltage, frequency and duty cycle on microhardness of Ni-Co alloy coatings were compared with microhardness as performance index. Variation of the microhardness of Ni-Co-MoS2 composite coatings as a function of MoS2 concentration provided with optimum technique parameters was studied. With the increase of CoSO4 concentration, the microhardness of Ni-Co alloy coatings first increased and then decreased, and reached 597.4HV, the maximum when CoSO4 concentration was 40 g/L. In the range of 4~12 V, the microhardness of the coatings increased as the voltage increased and duty cycle decreased. The microhardness of the coatings tended to increase as the frequency increased, and it decreased slightly when the frequency reached 1200 Hz. After a certain amount of MoS2 was added, microhardness of the coatings first increased and then decreased. Provided with CoSO4 concentration of 40 g/L, voltage of 12 V, frequency of 1000 Hz and duty ratio of 0.5, microhardness of the composite coatings reaches the maximum. Compared with the Ni-Co coatings free from MoS2, microhardness of Ni-Co-MoS2 composite coatings decreases. With the increase of MoS2 concentration, the microhardness of composite coatings first increases and then decreases. When the MoS2 concentration is 20 g/L, the microhardness reaches the maximum, 547HV. |
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