共 61 条
Nucleation and growth mechanism of Ni/SiC composite coatings electrodeposited with micro- and nano-SiC particles
被引:8
作者:
Rao, Han
[1
]
Li, Weiping
[1
]
Luo, Zilu
[1
]
Liu, Huicong
[1
]
Zhu, Liqun
[1
]
Chen, Haining
[1
]
机构:
[1] Beihang Univ, Sch Mat Sci & Engn, Natl Expt Teaching Demonstrat Ctr Mat Sci & Engn, 37 Xueyuan Rd, Beijing 100191, Peoples R China
来源:
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
|
2024年
/
30卷
关键词:
Ni/SiC composite coatings;
Electrodeposition;
Chronoamperometry;
Linear sweep voltammetry;
COMSOL simulation;
CU-DIAMOND COMPOSITES;
NANOCOMPOSITE COATINGS;
CORROSION-RESISTANCE;
WEAR BEHAVIOR;
NI;
NICKEL;
SIZE;
MICROSTRUCTURE;
CODEPOSITION;
SURFACTANTS;
D O I:
10.1016/j.jmrt.2024.04.008
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
To study the nucleation and growth mechanism of Ni/SiC composite coatings, electrodeposition was conducted in the Ni bath containing SiC particles with different sizes. Compared to the Ni coating electrodeposited from the bare Ni bath, the Ni/SiC composite coatings exhibited similar grain size but rougher surface morphology due to the incorporation of SiC particles. By means of chronoamperometry (CA) and linear sweep voltammetry (LSV) techniques, it was found that the introduction of SiC particles did not change the nucleation mode of Ni: the Scharifker-Hills three-dimensional instantaneous nucleation mode. However, the nucleation sites on the cathode were reduced due to the inert surface and low conductivity of SiC particles. At a step potential of -0.94 V, Ni presented the maximum nucleation density ( N 0 ) of 3.09 x 10 7 cm -2 , which was reduced by one order of magnitude for the Ni/SiC. Furthermore, SiC particles in the bath would extend the diffusion path of Ni 2} ions, resulting in the decrease in diffusion coefficient from 1.04 x 10 -7 cm 2 s - 1 (Ni) to 9.91 x 10 -9 cm 2 s - 1 (Ni/50 nm SiC), 1.83 x 10 - 8 cm 2 s - 1 (Ni/500 nm SiC) and 2.29 x 10 -8 cm 2 s - 1 (Ni/5 mu m SiC), suggesting the "Blocking effect". COMSOL simulation further confirmed the "Blocking effect". The "Blocking effect" would lead to excessive interface gaps around 5 mu m SiC particles due to the uneven electrodeposition of Ni. To address the issue, we proposed that adding non-ionic surfactants into the bath to lower the electrochemical reaction rate of Ni 2} ions and accordingly gained composite coatings with fine continuity.
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页码:3079 / 3091
页数:13
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