Fabrication and Performance of Ni-Co-P/Si₃N₄ Electroplated Composite Coatings on Al-Si Alloys

Abstract:

In order to improve the wear resistance of Al-Si alloys, the electro deposition of Ni-Co-P/Si₃N₄ coating on a hypereutectic Al-Si casting alloy was studied in this paper. The thickness, hardness, surface morphology, composition, adhesive force and wear resistance of Ni-Co-P/Si₃N₄ coating were measured by optical microscope, micro-hardness tester, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), adhesive attraction scratcher and abrasion tester. It was shown that Si₃N₄ particulates were uniformly distributed in the composite coating. And the effect of process parameters, such as electric current density, temperature, PH, plating time and component of electroplating bath,were obtained. The wear resistance of the coating was improved with the increase of hardness and the content of Si₃N₄ in the coating. It was also improved by decreasing electric current density. The adhesion of the coating was poor for increasing the content of P and Co in the coating. At the same time, the coating was hard, friable, and easy to be broken with the decrease of temperature.

• Periodical: Applied Mechanics and Materials (Volume 377)
• Pages: 235-239
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.377.235
• Online since: August 2013
• Authors: Yun Li, Liang Fang, Wei Dong Shen, Sheng Chun Wang, Chun Lan Cao, Jia Hu
• Keywords: Adhesive Performance, Al-Si Casting Alloy, Ni-Co-P/Si₃N₄ Coating, Wear Resistance

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