Effect of Micro/nano-SiC_(P)on Microstructure and Properties of Electroless Ni-P-SiC_(P)Composite Coatings  

微纳SiC_(P)对化学镀Ni-P-SiC_(P)复合镀层组织和性能的影响

作　　者：Chao Shuang Cao Jingjing Li Hezong Fan Lei Yang Junheng Harvey Christopher Martin 晁爽;曹晶晶;李河宗;范磊;杨军恒;Harvey Christopher Martin(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;中国矿业大学(北京)机械与电气工程学院,北京100083;拉夫堡大学航空与汽车工程系,英国拉夫堡LE113TU)

机构地区：[1]School of Mechanical and Equipment Engineering,Hebei University of Engineering,Handan 056038,China [2]Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province,Handan 056038,China [3]School of Mechanical and Electrical Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China [4]Department of Aeronautical and Automotive Engineering,Loughborough University,Loughborough LE113TU,UK

出　　处：《稀有金属材料与工程》2024年第10期2723-2734,共12页Rare Metal Materials and Engineering

基　　金：Science Research Project of Handan Bureau of Science and Technology(21422075242)。

摘　　要：Ni-P-SiC_(P) coatings were deposited on 42CrMo steel by electroless plating.The surface morphologies and phase structures of the Ni-P-SiC_(P) coatings processed under different SiC_(P) concentrations at different heat treatment temperatures were analyzed.The microhardness,corrosion resistance,and wear resistance of the Ni-P-SiC_(P) coatings were studied.Results show that Ni-P-SiC_(P) coatings exhibit cauliflower-like morphology.Increasing the SiC_(P) concentration can reduce the size of cellular structure.The microhardness and corrosion resistance are initially increased and then decreased with the increase in SiC_(P) concentration.The maximum microhardness and corrosion potential are 7379 MPa and−0.363 V,respectively,when the SiC_(P) concentration is 5 g/L.The Ni-P-SiC_(P) coatings exhibit an amorphous structure,and the width of the diffuse diffraction peak becomes narrower with the increase in SiC_(P) concentration.It is suggested that SiC_(P) inhibits the deposition of P and promotes the microcrystalline transformation.After heat treatment at 350℃,the Ni-P-SiC_(P) 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 SiC_(P) dispersion phase promotes the densification of the cellular structure,leading to the optimal microhardness(13828 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.通过化学镀在42Cr Mo钢上沉积Ni-P-SiC_(P)复合镀层。分析了在不同热处理温度下加工的不同SiC_(P)浓度Ni-P-SiC_(P)复合镀层的表面形貌和相结构。研究了Ni-P-SiC_(P)复合镀层的显微硬度、耐腐蚀性和耐磨性。结果表明,Ni-P-SiC_(P)复合镀层呈现花椰菜状形貌。增加SiC_(P)浓度可以减小胞状物的尺寸。显微硬度和耐腐蚀性随着SiC_(P)浓度的增加而先增加后降低。当SiC_(P)浓度为5 g/L时,最大显微硬度和腐蚀电位分别为7379 MPa和-0.363 V。Ni-P-SiC_(P)复合镀层呈现非晶态结构,漫散衍射峰的宽度随着SiC_(P)浓度的增加而变窄。这表明SiC_(P)抑制了P的沉积,促进了微晶转变。在350℃下热处理后,Ni-P-SiC_(P)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SiC_(P)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(13828MPa)、最佳的耐腐蚀性(-0.277 V)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。

关 键 词：42CrMo steel Ni-P-SiC_(P)composite coatings heat treatment corrosion resistance wear mechanism 

分 类 号：TG174.4[金属学及工艺—金属表面处理]