| YANG Hang-cheng,LU Yu,TIAN Hai-yan.Effect of Process Parameters on Friction and Wear Properties of Ni-Co Alloy Carcass[J],49(6):168-176 |
| Effect of Process Parameters on Friction and Wear Properties of Ni-Co Alloy Carcass |
| Received:November 07, 2019 Revised:June 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.06.020 |
| KeyWord:nickel-cobalt alloy electroplating friction factor wear resistance wear mechanism |
| Author | Institution |
| YANG Hang-cheng |
Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| LU Yu |
Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| TIAN Hai-yan |
Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| The work aims to study the effect of cobalt salt concentration, current density, and sodium saccharin concentration on the friction and wear properties of low cobalt Ni-Co alloy coatings, and improve the wear resistance, so as to facilitate the subsequent electroplating of diamond tools for aerospace material hole processing. Low cobalt Ni-Co alloy coating was prepared by electrodeposition in sulfamate plating system. The friction factor of the coating was studied by pin-and-disk friction and wear tester. The wear width, depth and morphology of the coating were observed by three-dimensional shaper and LEICA DVM500 microscope. The effects of different current densities, cobalt sulfamate concentration and sodium saccharin concentration on friction coefficient, wear resistance and wear morphology of the alloy were analyzed. When the cobalt salt concentration was increased from 6 g/L to 18 g/L, the friction factor could be reduced from 2.273 to 1.915, improving the surface flatness of the coating and reducing the friction factor. With the increase of cobalt salt concentration, the wear form was mainly from adhesive wear to abrasive wear, improving the resistance to plastic rheology and wear resistance. With the increase of current density, the average friction coefficient of the coating increased from 1.132 to 2.346, with an increase of 107%, the surface flatness decreased, the wear cross section showed a steady upward trend, the wear resistance of the coating deteriorated, and the wear mechanism turned into a double wear form of adhesive wear and abrasive wear. The addition of sodium saccharin increased the friction factor from 0.926 to 2.429, with a 1.6-fold increase, but the wear amount decreased significantly, and the wear mechanism was dominated by abrasive wear. Increasing the concentration of cobalt salt can refine the grain and reduce the friction factor, thus improving the wear resistance of the coating and promoting the wear of the abrasive particles. Increasing the current density makes the grain of the coating coarse, increasing the friction factor, decreasing the resistance to plastic deformation, reducing the wear resistance, and promoting the adhesion wear. Sodium saccharin has fine crystal action, which alleviates the wear fatigue of the coating and improves its resistance to plastic rheology, but has a directional effect on the friction factor. Current density of 2 A/dm2, Co(NH2SO3)2 concentration of 18 g/L and C7H4NNaO3S of 0.5 g/L can be selected as the best parameters to prepare the diamond tool nickel-cobalt alloy carcass material and the tool thus obtained has good friction and wear performance and can prolong its service life. |
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