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Journal of Chinese Society for Corrosion and protection  2021, Vol. 41 Issue (5): 579-584    DOI: 10.11902/1005.4537.2020.198
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Preparation of Micron SiC/Ni-Co-P Composite Coatings and Influencing Factors
ZHANG Chenyang1, LIU Huicong1, HAN Dongxiao2, ZHU Liqun1, LI Weiping1()
1.School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
2.Beijing Shiny Tech. Co. Ltd. , Beijing 100039, China
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Abstract  

Micron graded SiC/Ni-Co-P composite coating, as a substitute for Cr-plating was successfully prepared on 9Cr2Mo steel by galvanostatic deposition. On this basis, the effect of bath composition on the macro- and micro-morphology, composition and microhardness of the coating was assessed through single factor experiments. The results show that the acquired SiC/Ni-Co-P composite coating presents hardness of 646.11 (HV); the SiC/Ni-Co-P composite coating incorporated with strongly electronegative micron grade SiC particles has smoother surface with less microcracks but without pores, and the particle content is higher than that with electropositive and weak electric SiC particles. The process and interface behavior of the incorporated micro SiC particles in the coating by electrodeposition were investigated, and the effect of surface treatment of micron SiC on the coating was also interpreted.

Key words:  silicon carbide nickel matrix composite      silicon carbide modification      nickel base alloy electrodeposition      silicon carbide content     
Received:  19 October 2020     
ZTFLH:  TQ153  
Fund: National Key Research and Development Project(2018YFB2002000);National Natural Science Foundation of China(U1637204)
Corresponding Authors:  LI Weiping     E-mail:  liweiping@buaa.edu.cn
About author:  LI Weiping, E-mail: liweiping@buaa.edu.cn

Cite this article: 

ZHANG Chenyang, LIU Huicong, HAN Dongxiao, ZHU Liqun, LI Weiping. Preparation of Micron SiC/Ni-Co-P Composite Coatings and Influencing Factors. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 579-584.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2020.198     OR     https://www.jcscp.org/EN/Y2021/V41/I5/579

Fig.1  Coating surface (a~c) and SEM (d~f) images of electrodeposited SiC/Ni-Co-P films at 250 g/L (a, d), 300 g/L (b, e) and 350 g/L (c, f) concentration of NiSO4
Fig.2  Coating surface (a~c) SEM (d~f) images of electrodeposited SiC/Ni-Co-P films at 20 g/L (a, d), 30 g/L (b, e) and 40 g/L (c, f) concentration of NiCl2
Fig.3  SEM images of electrodeposited SiC/Ni-Co-P films at 5 g/L (a), 10 g/L (b), 20 g/L (c), 30 g/L (d), 50 g/L (e) and 70 g/L (f) concentration of SiC
Fig.4  Influence of SiC concentration on mass fraction of Si and hardness of coating
Fig.5  Particle size distribution of SiC after treatment with different ionic surfactants
Fig.6  Zeta potential of SiC after treatment with different ionic surfactants
Fig.7  SEM images of composite coating when SiC after treatment with SDBS (a), PVP (b), CTAB (c) andnone (d) ionic surfactants
CoatingSiCNiCoP
A27.2939.6825.986.740.58
B12.5334.8541.889.591.15
C1.3321.8569.597.130.09
D24.8237.3930.386.610.80
Table 1  Atomic percentage of elements in different coatings
Fig.8  SEM images of growth of crystal nucleus on SiC surface (a) and SiC is embedded by coating (b)
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