A study on the wear resistance characteristics of pulse electroforming Ni–P alloy coatings as plated |
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| Affiliation: | 1. Department of Mechanical Engineering, National Central University, Chung-Li, Taiwan, ROC;2. Department of Applied Chemistry, Chung Cheng Institute of Technology, National Defense University, Tahsi, Taiwan, ROC;1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria;2. Department Materials Physics, Montanuniversität Leoben, Austria;1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology-Madras (IIT-M), Chennai 600 036, India;2. College of Materials Science and Engineering, Jilin University, Changchun 130025, China;3. School of Planning, Architecture and Civil Engineering, Queen’s University Belfast, Belfast BT7 INN, UK;1. Institute of Metallurgy and Materials Science Polish Academy of Sciences, 25 Reymonta St., 30-059 Krakow, Poland;2. Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, 8 Niezapominajek St., 30-239 Krakow, Poland;3. Fideltronik Poland Ltd., 1 Beniowskiego St., 34-200 Sucha Beskidzka, Poland;1. Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, PR China;2. School of Materials Science and Engineering, University of Science and Technology of China, 72 Wenhua Road, Shenyang, 110016, PR China |
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| Abstract: | In this study, attempt has been initiated to investigate the wear resistance of Ni–P alloy coatings manufactured by pulse current (PC) electroforming technology. The wear tests of such plated coatings were carried out at ambient temperature and without lubricants. The parameters of the electroforming experiments include peak current density, duty cycle and pulse frequency. The results of this investigation showed that the internal stress of the PC-deposited Ni–P coating is much lower than that of direct current (DC) deposited Ni–P coating. The analytical results indicate that increasing of the phosphorus content in the layer reduces the hardness of the Ni–P electroformed coatings, and it gradually leads to transformation of the coatings structure from micro-crystalline to nano-crystalline/X-ray amorphous. Wear trace morphology shows that the wear mechanism of Ni–P coatings herein is related to hardness. As the hardness increases, the worn morphology of the coatings changes from with scratches and abrasions to that with the steel debris adhered on the coatings. The wear resistance of Ni–P alloy electroformed layers increases with the hardness of the coatings. The hardness primarily affects the wear resistance of the Ni–P as plated coatings, and the optimum wear resistance of Ni–P coatings can reach 11 times that of Ni coatings. |
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