李保松,张文,环宇星,张薇薇.海工机械Ni-Co/SiC纳米复合镀层微观结构及耐蚀性能研究[J].稀有金属材料与工程,2018,47(5):1509~1516.[Li Baosong,Zhang Wen,Huan Yuxing,Zhang Weiwei.Study on Microstructure and Corrosion Resistance of Ni-Co/SiC Nano Composite Alloys for Marine Machinery[J].Rare Metal Materials and Engineering,2018,47(5):1509~1516.]
海工机械Ni-Co/SiC纳米复合镀层微观结构及耐蚀性能研究
投稿时间:2016-06-22  修订日期:2017-01-24
中文关键词:  电沉积  SiC  Ni-Co/SiC  耐蚀性  纳米复合镀层
基金项目:国家自然科学基金资助(项目号51679076, 51301061, 51605137),中央高校基本业务费项目资助(项目号2013B32614)
中文摘要:
      采用扫描电子显微镜(SEM)、能谱分析(EDS)和X射线衍射(XRD)研究了纳米SiC颗粒对Ni-Co镀层结构和形貌的影响规律,通过EIS, Tafel电化学方法探究了Ni-Co/SiC电沉积过程及镀层的电化学腐蚀性能。结果表明,Co的加入使Ni镀层晶粒细化,孔隙率降低,并使部分结构非晶化,耐蚀性提高。纳米SiC颗粒具有促进Ni-Co合金形核长大和提高其硬度的双重作用,使Ni-Co/SiC耐磨性增强,与Ni-Co合金相比其Ecorr更正,icorr更小,Rc更大,具有优异的耐蚀性和耐磨性。Ni-Co/SiC具有更好的服役稳定性,而Ni-Co合金服役中耐蚀性降低较快。在服役过程中,镀层腐蚀过程经历了三个阶段,即浸润阶段,电解液在涂层中传输的扩散控制阶段,电解液到达基材表面后扩散速率已大于电化学速率的电化学控制阶段。Ni-Co/SiC合金具有良好的耐磨耐蚀性能,在海水多重因素交互作用下能够对海工机械提供长效防护,在海工防护领域具有良好的应用前景。
Study on Microstructure and Corrosion Resistance of Ni-Co/SiC Nano Composite Alloys for Marine Machinery
英文关键词:electrodeposition  SiC  Ni-Co/SiC alloys  corrosion resistance, nano composite coatings
英文摘要:
      In this paper, the effects of SiC nanoparticles on the structure and morphology of Ni-Co coating were investigated by scanning electron microscopy (SEM), energy spectrum analysis (EDS) and X ray diffraction (XRD). The influences of SiC nanoparticles on Ni-Co composite electrodeposition process and the electrochemical corrosion properties of Ni-Co/SiC composite coatings were studied by EIS and Tafel methods. The results show that the addition of Co2+ ions will refine the grain size of the Ni coating, reduce the porosity, transform some structure to amorphous and improve the corrosion resistance. SiC nanoparticles can promote the nucleation and growth of Ni-Co alloy and improve the hardness of the alloys. Compared with Ni-Co alloys, Ni-Co/SiC coatings have excellent corrosion and wear resistance which have the more positive Ecorr, the lower icorr and the larger Rc. Ni-Co/SiC composite coatings have the better stability of service performance, while the corrosion resistance of Ni-Co alloy decreased fast in 3.5 wt.% NaCl solution. The process of corrosion experienced three stages, namely the wetting stage, diffusion control stage which electrolyte transport in the coating and electrochemical control stage in which diffusion process is larger than that of electrochemical’s after electrolytes reach the substrate surface. Ni-Co/SiC alloys can provide long-term protection of marine engineering machinery under the influence of multifactors interaction in seawater environment.
作者单位E-mail
李保松 河海大学 力学与材料学院 江苏 南京 bsli@hhu.edu.cn 
张文 河海大学 力学与材料学院 江苏 南京  
环宇星 河海大学 力学与材料学院 江苏 南京  
张薇薇 河海大学 机电工程学院 江苏 常州  
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