Crystallization characteristics of Ni-W-P composite coatings reinforced by CeO2 and SiO2 nano-particles
来源期刊：中南大学学报(英文版)2014年第12期
论文作者：XU Rui-dong(徐瑞东) ZHAI Da-cheng(翟大成) ZHANG Yu-zhi(章俞之)
文章页码：4424 - 4431
Key words：composite coating; double pulse electrodeposition; Ni-W-P; nano-particles; crystallization characteristics
Abstract: Ni-W-P composite coatings reinforced by CeO2 and SiO2 nano-particles on the surface of common carbon steels, were prepared by double pulse electrodeposition. The crystallization course was characterized by phase structures, crystallinity, grain sizes and microstructures. The results indicate that as-deposited composite coating is amorphous. Whereas it turns into the crystalline structure with 98.25% crystallinity, and Ni3P, Ni2P and Ni5P2 alloy phases precipitate from structures at 400 °C. Thereafter, Ni2P and Ni5P2 metastable alloy phases turn into Ni3P stable alloy phase at 500 °C. The crystallization course of the composite coating has finished when being heat-treated at 700 °C. The average sizes of Ni grains increase with the rise of heat treatment temperature from 400 °C to 700 °C. CeO2 and SiO2 nano-particles deposited into Ni-W-P alloys can delay the crystallization course and habit the growth of alloy phases.
XU Rui-dong(徐瑞东)1, 2, ZHAI Da-cheng(翟大成)1, 2, ZHANG Yu-zhi(章俞之)3
(1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization
(Kunming University of Science and Technology), Kunming 650093, China;
2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
3. Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai 200050, China)
Abstract:Ni-W-P composite coatings reinforced by CeO2 and SiO2 nano-particles on the surface of common carbon steels, were prepared by double pulse electrodeposition. The crystallization course was characterized by phase structures, crystallinity, grain sizes and microstructures. The results indicate that as-deposited composite coating is amorphous. Whereas it turns into the crystalline structure with 98.25% crystallinity, and Ni3P, Ni2P and Ni5P2 alloy phases precipitate from structures at 400 °C. Thereafter, Ni2P and Ni5P2 metastable alloy phases turn into Ni3P stable alloy phase at 500 °C. The crystallization course of the composite coating has finished when being heat-treated at 700 °C. The average sizes of Ni grains increase with the rise of heat treatment temperature from 400 °C to 700 °C. CeO2 and SiO2 nano-particles deposited into Ni-W-P alloys can delay the crystallization course and habit the growth of alloy phases.
Key words:composite coating; double pulse electrodeposition; Ni-W-P; nano-particles; crystallization characteristics
