Influence of mode of electrodeposition, current density and saccharin on the microstructure and hardness of electrodeposited nanocrystalline nickel coatings

Wasekar, Nitin P.; Haridoss, Prathap; Seshadri, S.K.; Sundararajan, G.

doi:10.1016/j.surfcoat.2016.02.024

Cited by 132 publications

(55 citation statements)

References 33 publications

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“…The XRD pattern contains the first three reflections of the face-centered cubic Ni. The electrodeposited Ni for this study had weak (111) and strong (200) peaks, which are consistent with previous reports 5,15,22 . These peaks corresponded to inhibited lateral growth and free lateral growth, respectively, according to relationship proposed by Amblard et al 19 .…”

Section: Resultssupporting

confidence: 92%

“…The grain refinement is attributed to an increase in the impurity content. In fact, in electrodeposited Ni and Ni alloys, correlations have been confirmed between impurity 22 and solute contents 7,8 , and the grain size. Impurities and solute segregation have been proposed as the primary stabilizing mechanism of nanocrystalline structures 28,29 : the segregation reduces the GB energy and minimizes the thermodynamic driving force for grain growth.…”

Section: Discussionmentioning

confidence: 93%

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Microstructural heterogeneity in the electrodeposited Ni: insights from growth modes

Matsui

Watanabe

Takigawa

et al. 2020

Sci Rep

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Microstructures of electrodeposited ni were studied from the perspective of growth modes during electrodeposition. the electrodeposited ni had a heterogeneous microstructure composed of nanocrystalline-and microcrystalline-grains. Electron backscatter diffraction analyses showed that nanocrystalline-and microcrystalline-grains were preferentially oriented to specific planes. Secondary ion mass spectrometry also revealed that coarse-grained regions had higher S content than that of finer-grained regions. Hence, microstructural heterogeneity in electrodeposited Ni is reflected by the overlap of inhibited and free growth modes. our discussion surrounding microstructural heterogeneity also provides insight into other electrodeposited nanocrystalline systems. Nanocrystalline materials often exhibit more favorable properties than coarse-grained materials because of their nano-grain structure 1-3. Electrodeposition is a typical process for fabricating nano-grain structures 4. In practice, Ni and its alloys are electrodeposited with grain sizes below 100 nm 5-8 , and these electrodeposited nanocrystalline metals and alloys show high strength and good ductility 9-13. However, electrodeposited materials have fiber-like textures, which reflect the preferred crystallographic orientation of their crystallites along the growth direction 14,15. The texture formation of electrodeposits is determined by the electrodeposition conditions 16-18. Amblard et al. 19 explained that electrodeposition conditions change the growth mode during electrodeposition. Furthermore, they showed three types of growth modes, namely free-lateral growth, inhibited-lateral growth, and inhibited-out growth, and indicated that each growth mode resulted in specifically oriented textures on electrodeposited Ni. In the few cases where growth modes (or texture) have been considered 12,20,21 , these features have been shown to profoundly affect the microstructure and mechanical properties. Godon et al. 20 reported the relationship between grain orientation and the Hall-Petch relationship in electrodeposited Ni. The Hall-Petch plot of hardness was classified into three regions based on specific textures. In a subsequent report 21 , they found that grain refinement and changes of textures were linked with an increase in impurity content. The incorporation of impurities resulted from the inhibited growth mode. Matsui et al. 12 found a relationship between the tensile elongation and orientation index for the (200) plane in electrodeposited nanocrystalline Ni-W alloys. This relationship indicates that the free-lateral growth mode is suitable for producing ductile electrodeposited nanocrystalline materials. In previous studies 12,20,21 , the effects of growth modes have been discussed by comparison of typical samples having different dominant orientations. These comparisons are based on the assumption that typical samples are electrodeposited by a single growth mode. Contrary to this assumption, our belief is that the actual electrodeposited samples form with multip...

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Section: Resultssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 93%

Microstructural heterogeneity in the electrodeposited Ni: insights from growth modes

Matsui

Watanabe

Takigawa

et al. 2020

Sci Rep

View full text Add to dashboard Cite

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“…The calculated orientation index of (200) plan increases from 1.08 to 2.32, while the (111) and (220) orientation index decreases from 1.15 to 0.32 and 0.73 to 0.36 ( Figure 8b and Table 4), respectively. These results indicate that relative high electrolyte temperature is benefit for the preferred orientation of (200) plan, which is in agreement with previous studies [32].…”

Section: Effects Of Electrodeposition Parameters On Crystallographic supporting

confidence: 93%

Investigation of Electrodeposition External Conditions on Morphology and Texture of Ni/SiCw Composite Coatings

Lai

Sun

et al. 2019

Applied Sciences

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Recently, a strategy of synthesizing SiC whisker-reinforced nickel (Ni/SiCw) composites with excellent mechanical properties by electrodeposition has been proposed for exploring its potential applications in micromechanical devices. In this paper, a series of external conditions that affected the content of SiC whiskers in composite films were studied, such as cathode current density, stirring rate and electrolyte temperature. The experimental results indicated that the optimum morphology was obtained at a stirring speed of 300 rpm, a temperature of 50 °C, and a current density of 18 mA/cm2. Additionally, the content of SiC whiskers and textural preference were also investigated by varying its external conditions, and the results demonstrated that the composites with high mass percentage whiskers are more advantageous for electrocrystallization of Ni in the (200) orientation. Finally, the relationship between external conditions and intrinsic morphology, composition and texture of Ni/SiCw composites was revealed, and it provides a constructive approach to fabricate the high-content SiC whiskers of these composites.

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“…2,3 In the case of the industrial Ni electroplating process, the most traditional plating solution is based on the use of the aqueous Watt's bath. 1,2,4,5 However, electrodeposition of metals and alloys from aqueous solution is strongly influenced by hydrogen evolution reaction. For instance, the parallel production of hydrogen decreases the electrodeposition efficiency, causing deleterious effects to the corrosion resistance of the electrodeposited coatings, such as the hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition Study of Ni Coatings on Copper from Choline Chloride-Based Deep Eutectic Solvents

Urcezino

Santos

Casciano

et al. 2016

J. Braz. Chem. Soc.

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Nickel was electrodeposited from choline chloride (ChCl)-based deep eutectic solvents (DESs) containing ethylene glycol (EG) and urea (U) on Cu substrate. The influence of the temperature and of DESs nature was evaluated. The diffusion coefficients of nickel varied from 2.2 × 10 −9 to 3.7 × 10 −8 cm 2 s −1 for ChCl:2U and from 1.3 × 10 −8 to 5.8 × 10 −8 cm 2 s −1 for ChCl:2EG with increasing temperature. The nucleation process of Ni on Cu at 70 °C was determined as instantaneous in ChCl:2EG and progressive in ChCl:2U using Scharifker and Hills model. The SEM characterization showed that with increasing temperature, more compact coatings were obtained. Linear polarization and electrochemical impedance spectroscopy were used to evaluate the corrosion performance of the obtained deposits in 3.5% NaCl. The coatings were more protective as higher the temperature of deposition, with polarization resistance (R p) values from 3.53 to 19.11 kΩ cm 2 .

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Influence of mode of electrodeposition, current density and saccharin on the microstructure and hardness of electrodeposited nanocrystalline nickel coatings

Cited by 132 publications

References 33 publications

Microstructural heterogeneity in the electrodeposited Ni: insights from growth modes

Microstructural heterogeneity in the electrodeposited Ni: insights from growth modes

Investigation of Electrodeposition External Conditions on Morphology and Texture of Ni/SiCw Composite Coatings

Electrodeposition Study of Ni Coatings on Copper from Choline Chloride-Based Deep Eutectic Solvents

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