Study on the characteristics of Ni–W–P composite coatings containing nano-SiO₂ and nano-CeO₂ particles

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• 作者：Ruidong Xu ; Junli Wang ; Lifang He ; Zhongcheng Guo
• 关键词：Electrodeposition ; Composite coatings ; Micro hardness ; Abrasion resistance ; Structure
• 刊名：Surface and Coatings Technology
• 出版年：2008
• 出版时间：15 January 2008
• 年：2008
• 卷：202
• 期：8
• 页码：1574-1579
• 全文大小：1257 K

文摘

The aim of this research work was to co-deposit nano-SiO₂ and nano-CeO₂ particles into the Ni–W–P alloy coating in order to improve the surface properties further. Ni–W–P–SiO₂–CeO₂ composite coatings were prepared by co-deposition of nickel, tungsten, phosphorus, nano-SiO₂ and nano-CeO₂ particles on the surface of 15 steel from the electroplating bath which nano-SiO₂ and nano-CeO₂ particles were suspended by high speed mechanical stirring. The characteristics of the composite coatings were assessed by micro hardness test, Taber Abrader test, scanning electron microscopy and X-ray diffraction. The results obtained in this study indicate that the nano-SiO₂ and nano-CeO₂ particles were dispersed evenly within the Ni–W–P alloy coating and the bonding between the matrix metal and nano-SiO₂ and nano-CeO₂ particles is compact. That the co-deposition of nickel, tungsten, phosphorus, nano-SiO₂ and nano-CeO₂ particles leads to uniform Ni–W–P–SiO₂–CeO₂ composite coatings possessing better micro hardness and abrasion resistance properties when heat-treated at 400 °C for 3 h. In addition, that nano-CeO₂ and nano-SiO₂ particles can increase the thermal stability of Ni–W–P alloy coating at high temperature.