微纳SiCp对化学镀Ni-P-SiCp复合镀层组织和性能的影响
Effect of Micro/nano-SiCp on Microstructure and Properties of Electroless Ni-P-SiCp Composite Coatings
晁爽 1曹晶晶 2李河宗 2范磊 3杨军恒 1Harvey Christopher Martin4
作者信息
- 1. 河北工程大学机械与装备工程学院,河北邯郸 056038
- 2. 河北工程大学机械与装备工程学院,河北邯郸 056038;河北省智能工业装备技术重点实验室,河北邯郸 056038
- 3. 中国矿业大学(北京)机械与电气工程学院,北京 100083
- 4. 拉夫堡大学航空与汽车工程系,英国拉夫堡LE11 3TU
- 折叠
摘要
通过化学镀在42CrMo钢上沉积Ni-P-SiCp复合镀层.分析了在不同热处理温度下加工的不同SiCp浓度Ni-P-SiCp复合镀层的表面形貌和相结构.研究了Ni-P-SiCp复合镀层的显微硬度、耐腐蚀性和耐磨性.结果表明,Ni-P-SiCp复合镀层呈现花椰菜状形貌.增加SiCp浓度可以减小胞状物的尺寸.显微硬度和耐腐蚀性随着SiCp浓度的增加而先增加后降低.当SiCp浓度为5g/L时,最大显微硬度和腐蚀电位分别为7379 MPa和-0.363 V.Ni-P-SiCp复合镀层呈现非晶态结构,漫散衍射峰的宽度随着SiCp浓度的增加而变窄.这表明SiCp抑制了 P的沉积,促进了微晶转变.在350 ℃下热处理后,Ni-P-SiCp复合镀层结晶,导致Ni3P相沉淀.在400 ℃下热处理1 h可使结构最大化.镀层中Ni3P析出强化相和SiCp弥散强化相的协同作用,促进了胞状组织的致密化,从而获得了最佳的显微硬度(13 828 MPa)、最佳的耐腐蚀性(-0.277V)和优异的耐磨性.磨损机制以微切削磨料磨损为主,伴有轻微的粘着磨损和氧化磨损.
Abstract
Ni-P-SiCp coatings were deposited on 42CrMo steel by electroless plating.The surface morphologies and phase structures of the Ni-P-SiCp coatings processed under different SiCp concentrations at different heat treatment temperatures were analyzed.The microhardness,corrosion resistance,and wear resistance of the Ni-P-SiCp coatings were studied.Results show that Ni-P-SiCp coatings exhibit cauliflower-like morphology.Increasing the SiCp concentration can reduce the size of cellular structure.The microhardness and corrosion resistance are initially increased and then decreased with the increase in SiCp concentration.The maximum microhardness and corrosion potential are 7379 MPa and-0.363 V,respectively,when the SiCp concentration is 5 g/L.The Ni-P-SiCp coatings exhibit an amorphous structure,and the width of the diffuse diffraction peak becomes narrower with the increase in SiCp concentration.It is suggested that SiCp inhibits the deposition of P and promotes the microcrystalline transformation.After heat treatment at 350 ℃,the Ni-P-SiCp coatings are crystallized,resulting in the precipitation of Ni3P phase.Heat treatment at 400 ℃ for 1 h maximizes the structure.The synergistic effect of the Ni3P precipitate phase and SiCp dispersion phase promotes the densification of the cellular structure,leading to the optimal microhardness(13 828 MPa),optimal corrosion resistance(-0.277 V),and excellent wear resistance.The wear mechanism is dominated by micro-cutting abrasive wear with slight adhesive and oxidative wear.
关键词
42CrMo钢/Ni-P-SiCp复合镀层/热处理/耐腐蚀性/磨损机理Key words
42CrMo steel/Ni-P-SiCp composite coatings/heat treatment/corrosion resistance/wear mechanism引用本文复制引用
基金项目
Science Research Project of Handan Bureau of Science and Technology(21422075242)
出版年
2024
NETL
NSTL
万方数据