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Preparation of Nickel-Cobalt/Carborundum Carbide Composite Coatings by Supergravity Field-Enhanced Electrodeposition

Abstract

Nickel-cobalt/silicon carbide (Ni-Co/SiC) composite coatings were fabricated by supergravity field-enhanced electrodeposition. The surface morphology and the distribution of the SiC particles in the coatings were examined by scanning electron microscope and energy dispersive X-ray spectrometry. The preferred orientations of the coatings were measured by X-ray diffractometry. The wear resistance and microhardness were measured by a reciprocating tribometer and a microhardness instrument, respectively. The results revealed that the use of the supergravity field enhanced the smoothness of the as-deposited Ni-Co/SiC coatings, and the SiC nanoparticles were uniformly distributed in comparison with that for conventional electrodeposition. When the rotation speed of the cathode, which provided the supergravity field, was 800 r/min, the SiC content in the coating reached a maximum of 8.1 wt%, which was a much higher content than the 2.2 wt% value obtained under conventional electrodeposition. The highest coating microhardness of 680 HV was also observed at this rotation speed. In addition, the wear resistance of the as-prepared Ni-Co/SiC coatings exhibited improved performance relative to that prepared under normal gravity. A minimum wear weight loss of 1.4 mg together with an average friction coefficient of 0.13 were also realized at a rotation speed of 800 r/min, values which were much lower than those for normal gravity.

1 Introduction

Nickel-cobalt (Ni-Co) alloy coatings as an important engineering material exhibit many attractive features, such as high hardness, good wear and corrosion resistance, and good magnetoconductivity, thermal conductivity and electrocatalysis activity [1,2,3,4]. The coatings have been used extensively in diverse fields including magnetic sensor technology [5], aerospace, micro-electromechanical systems and nano-electromechanical systems [6]. Nowadays, the consensus is that particle-reinforced composite coatings exhibit better performance than alloy coatings [7,8,9]. Thus, to further improve certain properties of the target components, insoluble particles are usually incorporated into the alloy coatings. Given the attractive features of Ni-Co alloys, much work has been done concerning the Ni-Co matrix. For instance, Cr2O3 [10], Al2O3 [11, 12] and diamond [13] have been successfully embedded into the Ni-Co matrix such that enhanced properties for these composite coatings have been obtained.

Among the particulates used for strengthening purposes, SiC possesses excellent chemical stability and mechanical characteristics in severe environments and has been widely investigated [14,15,16,17]. Given the importance of Ni-Co coatings, much attention has been directed at Ni-Co/SiC composite coatings, and many studies have focused on electrodeposition whereby insoluble particles with metallic cations, which are suspended in electrolyte, undergo co-deposition [18]. Bakhit suggested that Ni-Co/SiC coatings, which are reinforced by the nanosized SiC particles, possess enhanced properties in comparison with those of micro-sized SiC particles [18]. However, in the case of nanoscale particles, researchers have reported that it is more difficult to incorporate nanosized particles than micro-sized ones due to agglomeration [19], which may lead to a drastic decrease in the mechanical properties of the composite coatings [20] and reduce the co-deposition content of the particles [19]. To obtain Ni-Co/SiC composite coatings with well–dispersed nanoscale SiC particulates and to increase the content of SiC in the coatings, sodium dodecyl sulphate as surfactant has been added to the electrolyte solution [7]. In addition, a sediment co-deposition technique which exploits gravity was proposed to promote nanoparticle embedment [18].

Recently, the supergravity field effect has been attracting attention in electrochemistry. It has been reported that convection is enhanced and thus mass transfer is improved under the supergravity field [21, 22]. Moreover, coatings offering improved performance were achieved using electrodeposition with a supergravity field [23]. Using a supergravity field with electrodeposition, Murotani et al. increased the volume fraction of SiC in a Ni matrix and found that the morphological structure of the as-deposited film was also influenced by the supergravity field [24]. As for the Ni-Co/SiC nanocomposite coatings, although much work has been done, few studies have reported on the preparation of Ni-Co/SiC nanocomposite coatings using a supergravity field. Considering the benefits of a supergravity field, the present work concerns the fabrication of Ni-Co/SiC nanocomposite coatings. The effects of the supergravity field on the SiC content, the morphology, the grain size, the microhardness and the wear resistance have been investigated.

2 Experimental Details

The setup used here has been detailed described in previous work [25]. Various supergravity fields were generated by changing the rotation speed of the motor [21]. The anode was a hollow cylinder made of pure Ni with the following dimensions: thickness 2 mm, length 35 mm and outer diameter (Φ) 40 mm. The substrate was a hollow cylinder made of 304 SS (stainless steel) of thickness 5 mm, length 37 mm and Φ48 (inner diameter). The gap between the substrate and the cathode was 4 mm. The motor drove the cathode, positioned inside the cylindrical fixture, to rotate at user-adjustable rotation speeds. Electrolyte solution was pumped continuously into the hollow cylinder anode at constant flow. Throughout the experiment, the anode was fixed while the cathode rotated.

Based on our previous work [26], the force analysis of SiC particles is shown in Figure 1. The SiC particles suffered from five forces: gravity force (Gra), centrifugal force (Fc), buoyancy force (Fb), drag force (Fd), and centripetal buoyancy force (Fbr). The drag force is generated because of the relative motion between the SiC particles and electrolyte. The pressure difference along the radius direction results in the centripetal buoyancy force. In this case, If the rotation speed is excessively large, the resultant force point toward the anode (\(F^{\prime}_{r}\) in Figure 1), which makes the SiC particles travel away from the substrate. Otherwise, the resultant force directs toward the substrate (Fr in Figure 1), resulting in the movement of the SiC particles to the substrate. It is expected that the resultant force points toward the substrate, which is favorable.

Figure 1
figure 1

Force analysis of SiC at different positions under a supergravity field

On the basis of previous work [27], the chemical composition of the electrolyte solution used in this work is specified in Table 1. The average size of the SiC particles used was 40 nm. Before the experiments, the electrolyte solution was stirred for 1 h to prevent aggregation of SiC and to promote dispersal of the Co ions in the electrolyte. Throughout experimentation, the thicknesses of the deposited coatings were about 60 µm. The rotation speed ranged from 0 to 1600 r/min. The supergravity coefficients G were obtained by Eq. (1):

$$G\, = \,N^{2} \pi^{2} \text{ / }\left( {900g} \right)$$
(1)

where N denotes the rotation speed (rotations per minute); r represents the radius of the fixture (0.05 m in this study); and g is the acceleration due to gravity (9.8 m/s2). Under a normal gravity field, G is 0.

Table 1 Electrolyte composition and electrolysis conditions

The surface morphology was investigated using a scanning electron microscope (SEM, S3400N Hitachi, Tokyo, Japan) with an acceleration voltage of 20 kV. The contents of SiC in the composite coatings were measured by an energy dispersive X-ray spectrometer linked to an electron microscope (EDS, S3400N, Hitachi, Tokyo, Japan). The measurements were performed with an operating voltage of 20 kV a pulse count rate of 6000 cps and a run time of 1 min per sample. The region examined was 100×100 μm2. For each sample, six test regions were analysed and the average of the six results was calculated. An X-ray diffractometer (XRD, X’TRA, ARL, Switzerland) with CuKα radiation λ = 1.5406 Å generated at 40 kV and 40 mA was used to detect the preferred crystal orientation. The spectra were recorded over the 2θ range 30°–110° with a scanning rate of 0.01°. The microhardness of the prepared Ni-Co/SiC coatings was examined using a microhardness tester (HXS—1000A, Shanghai Shangguang Instrument Plant, Shanghai, China) with a loading force of 50g for 10 s. For every as-deposited coating, the measurement was repeated five times. Wear resistance tests were carried out at ambient temperature without lubrication on a reciprocating tribometer (HEIDON, SOHGOHKEISO, Co. LTD, Japan), and the counter-body was a Φ6 mm 304L SS ball with a hardness of HRC 63. The testing parameters were: applied load of 5 N, frequency of 3 Hz, stroke of 10 cm, testing time 15 min. The friction coefficient was recorded continuously during the test.

3 Results and Discussion

3.1 Morphological Characteristics

The SEM images of the Ni-Co/SiC composites prepared with and without a supergravity field are presented in Figure 2. It is evident that the surface morphology was rougher for the composite prepared without the supergravity field (Figure 2a) than with the supergravity field (Figure 2b–e). In addition, for the former, large protrusions were present on the surface. The surface was smoother for a rotation speed of 400 r/min, but spherical clusters were still observed, as shown in Figure 2b. When the rotation speed increased to 800 r/min, the surface was further smoothened as can be seen from Figure 2c and no substantial protrusions were noted. As rotation speed further increased, the surface morphology of the coatings began to deteriorate and featured a nodular morphology. In this case, the larger the rotation speed, the rougher the surface became, as revealed by Figure 2d and e. Mappings of the Si distribution for Figure 2a and c are presented in Figure 2f and g. It reflects that a nonuniform distribution of SiC nanoparticles in the Ni-Co/SiC composite coatings and agglomerations are observed in Figure 2f. However, Figure 2g indicates that a uniform distribution of the SiC nanoparticles in the Ni-Co/SiC composite coatings was obtained for electrodeposition with a supergravity field.

Figure 2
figure 2

Morphologies of Ni–Co/SiC coatings formed at a current density of 2 A/dm2 and Co content of 40 g/L under various rotation speeds: a 0 r/min, b 400 r/min, c 800 r/min, d 1200 r/min and e 1600 r/min; f Image for Si distribution of c, g Image for Si distribution of a

For regions in the vicinity of the peaks due to the SiC nanoparticles, the strength of the electric field is maximal compared with other positions [28]. As such, the cations would preferentially deposit on the coating peaks, resulting in spherical clusters being formed on the growing coating surface. However, under the action of the supergravity field, the number of peaks is reduced which leads to a flatter surface. Therefore, the supergravity field was beneficial for obtaining good surface morphology in the electrodeposition process.

3.2 Contents of SiC and Co in the Coating

Based on the EDS results, the contents of SiC in the Ni–Co/SiC composite coatings under different supergravity fields are presented in Figure 3. Compared with the SiC content obtained in conventional electrodeposition, i.e., without a supergravity field, the contents increased remarkably when the supergravity field was applied. The maximal value of 8.1 wt% was achieved for a rotation speed of 800 r/min. Further increases in the rotation speed resulted in a reduction in the SiC content. Under the supergravity field, the SiC nanoparticles were enriched in the vicinity of the cathode surface due to the centrifugal force, making the concentration of SiC higher near the diffusion layer at the cathode surface than in the bulk solution. Over a certain range of the supergravity field, the increase of rotation speed assisted in enhancing the weak SiC adsorption capacity [29]. On the basis of Guglielmi’s two-step adsorption mechanism [30], first the SiC nanoparticles would have been loosely adsorbed on the cathode surface on which metal ions were deposited. Then the SiC particles would have been transported to the cathode surface through electrophoretic attraction and subsequently have been adsorbed on the cathode surface via Coulombic forces. With a further increase of rotation speed, the flow speed of the solution would have increased, and would have scoured the cathode surface more intensively. In this case, the SiC nanoparticles that were weakly adsorbed on the cathode surface were more liable to be stripped from the cathode surface. Moreover, a higher rotation speed led to a higher SiC concentration near the diffusion layer at the cathode surface, increasing the number of collisions between the nanoparticles adsorbed on the cathode surface and the ones in the bulk solution. Under such conditions, more SiC nanoparticles that were loosely adsorbed on the cathode surface would have tended to undergo desorption. Therefore, a decrease in the SiC content was observed at the higher rotation speeds.

Figure 3
figure 3

SiC content in Ni-Co/Si coatings under different supergravity fields

3.3 X-ray Diffraction Pattern

The X-ray diffraction (XRD) spectra for the coatings are presented in Figure 4. It can be seen that under the normal gravity field four diffraction peaks may be observed (111), (200), (220) and (311), as shown in Figure 4a. However, when the supergravity field is introduced, the (222) diffraction peak is clearly distinct from the four above mentioned diffraction peaks, as revealed in Figure 4b–e. In addition, all the XRD data show that the Ni–Co/SiC composite coatings are face-centred cubic structures. Peaks for SiC are only found in the XRD data when the rotation speeds are 800 r/min and 1200 r/min respectively. This is because the SiC content in the coatings prepared with rotation speeds of 800 r/min and 1200 r/min is large enough to be detected. In other cases, the SiC content in the prepared coatings is too low to be detected. The texture coefficient (TC) is calculated by Eq. (2) [31] with the TC being used to evaluate the preferred crystal orientation. The TC results are illustrated in Figure 4f.

$$TC_{hkl} { = }\frac{{{{I_{hkl} } \mathord{\left/ {\vphantom {{I_{hkl} } {I_{hkl}^{R} }}} \right. \kern-0pt} {I_{hkl}^{R} }}}}{{{1 \mathord{\left/ {\vphantom {1 {n(\sum {{{I_{hkl} } \mathord{\left/ {\vphantom {{I_{hkl} } {I_{hkl}^{R} }}} \right. \kern-0pt} {I_{hkl}^{R} }}} )}}} \right. \kern-0pt} {n(\sum {{{I_{hkl} } \mathord{\left/ {\vphantom {{I_{hkl} } {I_{hkl}^{R} }}} \right. \kern-0pt} {I_{hkl}^{R} }}} )}}}},$$
(2)

where Ihkl and \(I_{hkl}^{R}\) are the diffraction intensities of the crystal plane (hkl) in the coating and standard samples, respectively and n is the number of reflection faces in the diffraction pattern. According to Figure 4f, it is clear that under a normal gravity field, the TC value of 1.4 for the plane orientation of (200) is higher than 1, which indicates the predominance of this phase. In contrast, the TC value of the plane orientation for (200) falls below 1 when rotation is applied (all conditions), suggesting its loss of predominance. Also, the TC value for the plane orientation of (111) increases dramatically to a specific value much greater than 1 in each case, which demonstrates a shift of preferential orientation from (200) to (111). In comparison with the normal gravity field, the supergravity field influences the texture growth of the Ni–Co/SiC coating and the (222) phase is enhanced.

Figure 4
figure 4

XRD patterns of deposited Ni–Co/SiC coatings under rotation speeds of: a 0, b 400 r/min, c 800 r/min, d 1200 r/min and e 1600 r/min. f Texture coefficient versus rotation coefficient

Based on the Scherrer equation given below [32], the crystallite size is calculated for the Ni–Co/SiC coatings obtained with and without the supergravity field, and the results are presented in Figure 5.

$$FWHM\, = \,\frac{K\lambda }{D\cos \theta }\, \cdot \,\frac{{180{^\circ }}}{\pi },$$
(3)

where the FWHM is the full width half maxima (2θ degrees), D is the grain size in nanometres, K is a constant (generally 0.94) and the wavelength of Cu Kα radiation is 0.154 nm. It is evident that the grain size of the Ni–Co/SiC coating prepared under normal gravity is the largest, about 42.5 nm, while the values for the samples prepared under supergravity are reduced remarkably in all instances. The minimum value of 17 nm is reached at a rotation speed of 800 r/min. The crystallite size depends on both the nucleation rate and grain growth rate. A nucleation rate that is larger than the grain growth rate leads to a smaller grain size, whereas a dominant grain growth rate yields a larger grain size. Under the supergravity field, the SiC concentration in the vicinity of the diffusion layer at the cathode surface is elevated and this offers more nucleation sites [33] and subsequently leads to a smaller grain size. Moreover, SiC particles absorbed on cathode decrease the effective reaction area, lowering the reduction potential of matrix [34]. Therefore, nucleation rate is increased, leading to refined grain size. As discussed in the part of force analysis of SiC particles, when the resultant force points towards the anode, SiC particles move away from newly-formed coating surface. As a result, the number of SiC particles reduces relatively, leading to less nucleation sites and subsequently larger grain size. However, a further increase of rotation speed makes the resultant force point towards the anode. Hence, the grain size becomes relatively larger as the rotation speed increases above 1200 r/min.

Figure 5
figure 5

Grain size as a function of rotation speed

3.4 Microhardness of the Coating

The relationship between the microhardness of the obtained Ni-Co/SiC coatings and the rotation speed is shown in Figure 6. As can be seen, the microhardness values achieved under the supergravity field were higher than that at normal gravity. For rotation speeds no greater than 800 r/min, the microhardness values increased sharply and reached the maximum value of 680 HV at 800 r/min. Thereafter, the microhardness values decreased for rotation speeds higher than 800 r/min, becoming about 510 HV. As mentioned above, the dispersion of SiC nanoparticles into the coatings could decrease the grain size. Based on the Hall-Petch relationship [35], the internal dislocation movement determines the degree of deformation of the coatings, and the grain boundary can effectively hinder the dislocation movement. Smaller grains produce a greater level of grain boundaries and consequently provide superior impediment to dislocation movement, leading to reinforcement of the microhardness. In addition, due to the addition of SiC into the matrix, plastic deformation of the Ni-Co matrix would result in a shrinking effect because of the dispersion-strengthening effect, resulting in a dramatic reinforcement of coating microhardness [36]. However, a rotation speed greater than 800 r/min would contribute to the formation of larger grain sizes, thus lowering the coating microhardness. However, such high speeds would also contribute to a decreasing SiC content in the coating, as discussed above, which, correspondingly, would reduce the dispersion-strengthening effect.

Figure 6
figure 6

Microhardness values for the Ni-Co/SiC coatings prepared at: a 0, b 400 r/min, c 800 r/min, d 1200 r/min, and e 1600 r/min

3.5 Wear Resistance

The data for the wear resistance tests are presented in Figure 7. It can be seen that the friction coefficient obtained with a normal gravity field is much larger than the values achieved under the supergravity field, as shown in Figure 7a. As the rotation speed is increased to 800 r/min, the friction coefficient decreased and then increases moderately when the rotation speed exceeds 800 r/min. The minimal value for the friction coefficient is approximately 0.13. It can also be observed that the wear weight change shows a similar trend as illustrated in Figure 7b. The smallest wear weight loss obtained is about 1.4 mg. The SEM images for the worn surfaces of the as-prepared coatings after the wear tests are presented in Figure 8. It is evident that the prepared Ni-Co/SiC coatings sustained adhesive wear. Generally, the coatings deposited under the supergravity field conditions are less worn than those for the normal gravity field. Although ploughing is evident on all worn coatings, much more spalling are generated on the coatings formed under the normal gravity field, as shown in Figure 8a. Less spalling can be seen on the worn surfaces with a rotation speed of 400 r/min as shown in Figure 8b. No visible spalling can be observed as the rotation speed is varied from 800 r/min to 1200 r/min. A relatively small level of spalling starts to appear on the worn surface obtained at 1600 r/min, as depicted in Figure 8e. Moreover, the spalling trace generated on the surface corresponding to 800 r/min is the smallest among the coatings.

Figure 7
figure 7

Effect of the supergravity field on: a the friction coefficient, and b the wear weight loss

Figure 8
figure 8

SEM images of the worn surfaces of Ni–Co/SiC coatings obtained at different rotation speeds: a 0, b 400 r/min, c 800 r/min, d 1200 r/min and e 1600 r/min

Based on the Archard model [37], hardness has positive effects on wear resistance to some extent. It is intuitive that the higher the microhardness value is for a material the better will be the wear resistance and consequently the smaller will be the friction coefficient and the wear weight loss. Also, the surface morphology makes a contribution to wear resistance. That is, a smoother surface morphology is beneficial to achieving a better wear resistance [38].

4 Conclusions

  1. (1)

    In comparison with electrodeposition under normal gravity, supergravity field-enhanced electrodeposition resulted in a smoother Ni-Co/SiC coating surface morphology, which was partly due to the uniform dispersion of SiC nanoparticles in the coatings under the enhanced gravity conditions. The more nucleation sites offered by the SiC nanoparticle also contributed to the realization of a flat surface.

  2. (2)

    In general, the SiC content of the Ni-Co/SiC coatings prepared with a supergravity enhanced field was higher than that achieved for conventional electrodeposition. For a specific range of rotation speeds, the SiC content increased monotonically to a maximum value. Further increases in rotation speed, however, led to reductions in the SiC content of the coatings. The highest SiC content achieved was 8.1 wt%.

  3. (3)

    The distribution of SiC nanoparticles in the Ni-Co/SiC coatings constrained dislocation movement and hence the strength and microhardness of the coatings increased. The largest microhardness value achieved under the supergravity field conditions was 680 HV, indicating a remarkable enhancement of microhardness in contrast to that obtained with conventional electrodeposition.

  4. (4)

    The Ni-Co/SiC coatings produced by supergravity field-enhanced electrodeposition showed noticeably improved wear resistance as compared to conventional electrodeposition. At 800 r/min, the Ni-Co/SiC coating exhibited the lowest wear weight loss of 1.4 mg as well as the smallest average friction coefficient of 0.13. These conditions also yielded the narrowest wear scar due to grain refinement and the dispersion-strengthening effect of the SiC nanoparticles.

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Acknowledgements

The authors sincerely thanks to the team members in our research group for their critical discussion and reading during manuscript preparation.

Funding

Supported by National Key Research and Development Program of China (Grant No. 2018YFB1105900), National Basic Research Program of China (973 Program, Grant No. 2015CB057502), and Fundamental Research Funds for the Central Universities (Grant No. NZ2016106).

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XY was in charge of the whole trial and wrote the manuscript; NS assisted with sampling and laboratory analyses. All authors read and approved the final manuscript.

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Correspondence to Xiaoyun Hu.

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Hu, X., Qu, N. Preparation of Nickel-Cobalt/Carborundum Carbide Composite Coatings by Supergravity Field-Enhanced Electrodeposition. Chin. J. Mech. Eng. 33, 57 (2020). https://doi.org/10.1186/s10033-020-00478-8

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