Electrophoretic Deposition of Cu-SiO2 Coatings by DC and Pulsed DC for Enhanced Surface-Mechanical Properties

Maharana, H.S.; Lakra, Suprabha; Pal, Snehanshu; Basu, A.

doi:10.1007/s11665-015-1834-1

Cited by 12 publications

(8 citation statements)

References 24 publications

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“…Anodising peak current vs. applied pulse frequency for AA1050.The observations presented above reveal that the anodising kinetics and the optical appearance are improved when moving from direct current anodising to high frequency pulse anodising mode. This is in close resemblance to the observations that are made for electrodeposition of certain metals where it is well documented that pulse electrodeposition is associated with advantages such as significant improvement in surface properties, higher deposition rates, reduction in porosity, better corrosion resistance, less porosity, reduced grain size and lower surface roughness[79] [80]. Maharana et al[80] concludes that surface roughness decreases during increasing frequency upon electrodeposition of Cu-SiO2 coatings.…”

supporting

confidence: 72%

“…This is in close resemblance to the observations that are made for electrodeposition of certain metals where it is well documented that pulse electrodeposition is associated with advantages such as significant improvement in surface properties, higher deposition rates, reduction in porosity, better corrosion resistance, less porosity, reduced grain size and lower surface roughness[79] [80]. Maharana et al[80] concludes that surface roughness decreases during increasing frequency upon electrodeposition of Cu-SiO2 coatings. This is explained by a greater number of nucleation sites upon using pulse mode compared to direct current, which in turn leads to a smoother film with a lower Ra value.…”

supporting

confidence: 72%

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High frequency pulse anodising of aluminium: Anodising kinetics and optical appearance

Jensen

Gudla

Kongstad

et al. 2019

Surface and Coatings Technology

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High frequency pulsed anodising of pure aluminium was investigated with an aim to understand the effect of the anodising parameters on the growth kinetics of the anodic layer and optical appearance of the anodised surface. Anodising was performed in sulphuric acid, and the effect of the pulse duty cycle, applied potential offset, and pulse frequency was investigated. Optical properties of the anodised surfaces are improved upon lowering the anodising potential and by increasing the frequency of the applied potential pulses. Temperature evolution of the samples during anodising was investigated by employing a special flat cell setup equipped with a thermocouple close to the sample. The effect of high frequency pulsing of the anodising potential on the anodising kinetics is presented, which is related to the temperature evolution and dielectric losses, and the effect is compared to the traditional DC anodising process. From the observations, it is postulated that the dominant factor responsible for the improved growth kinetics during high frequency pulsed anodising might not be dielectric losses instead a thickness reduction in the Gouy-Chapman/Helmholtz layers.

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supporting

confidence: 72%

supporting

confidence: 72%

High frequency pulse anodising of aluminium: Anodising kinetics and optical appearance

Jensen

Gudla

Kongstad

et al. 2019

Surface and Coatings Technology

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“…The decrement in WC co-deposition in the case of 7 g l −1 WC added coating could be accredited to the concentration saturation. This means that a minor decrease in WC co-deposition beyond 5 g l −1 can be ascribed to the accumulation of the WC particles in the electrolyte during the deposition [25,26].…”

Section: Composition and Microstructural Analysismentioning

confidence: 99%

Structure and properties of pulse electrodeposited Cr–WC coating

Yadlapalli¹,

Maharana²,

Basu³

2020

Surf. Topogr.: Metrol. Prop.

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Pure Cr and Cr-WC coatings are electrodeposited by both direct current (DC) and pulse current (PC) methods. The deposition was carried out with different (0, 3 and 5 kHz) pulse frequencies with varying nano-sized tungsten carbide (WC) loading (0, 3, 5 and 7 g l −1 ) of the electrolytic bath. X-ray diffraction (XRD) results of the coatings display Cr coating with BCC structure along with minor WC peak after the enlargement of the peaks. Scanning electron microscope (SEM) images depict uniform and finer morphology for the coatings prepared at 3 kHz pulsing conditions. However, the coatings prepared at 5 kHz pulse show non-uniform coarse morphology. All the coatings display low surface roughness i.e. <1 μm. The hardness result of the coatings was mainly depended on WC incorporation. The Cr-WC coatings show excellent tribological properties, unlike pure Cr coating. After analysis of all the properties, it is observed that Cr-5 g l −1 WC (3 kHz) shows optimum properties in terms of coating morphology, hardness, and wear behavior. RECEIVED

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“…The advantages of electrodeposition is an excellent low cost and low temperature technique compared to the conventional methods such as powder metallurgy, sputtering, spin coating, thermal spraying, centrifugal casting etc., which is used to coat over the complicated conductive surfaces. Electrodeposition is an industrially viable and economically preferable technique for the deposition of metals and alloys and metal matrix nanocomposites (MMNCs) [23][24][25][26][27][28][29][30][31][32]. The SiCnanoparticlesare very hard materials and possess high strength and high thermal conductivity, good corrosion and wear resistance and low cost material.…”

Section: Introductionmentioning

confidence: 99%

Nano SiC Reinforced Copper Nanocomposite by a Simple Electrodeposition Method

Ramalingam¹

2019

IJEAT

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The Cu and Cu-SiCnanocomposite coatings were prepared by a simple electrodeposition technique from acidic copper sulphate electrolyte using SiC nanoparticles with an average particles size of 50 nm under optimized bath composition and preparation conditions for possible electrical contact material applications such as electrical switch and wiring boards where higher electrical conductivity and thermal conductivity is required. The scope of the present study is to enhance the strength, mechanical, corrosion and wear resistance properties of Cu-SiCnanocomposite compared to pure Cu coatings. The as prepared Cu and Cu-SiCnanocomposites were characterized for structural, mechanical and corrosion resistance properties by EDX, XRD, FESEM, Vickers microhardness tester and AC-impedance and Tafel polarization techniques. The elemental composition (wt% of Cu and SiC nanoparticles) of Cu-SiCnanocomposites was analyzed by EDX coupled with FESEM analysis confirms the presence of nanoSiC in the copper matrix and they were 89wt% of Cu and 11 wt% of SiC nanoparticles respectively. The surface morphology of Cu and Cu-SiCnanocomposites was studied by FESEM analysis shows that SiC nanoparticles were uniformly dispersed in the surface of the copper matrix compared to pure copper. The crystallite structure and grain size of the Cu and Cu-SiCnanocomposite electrodeposits was measured by XRD analysis. From the XRD results, the grain size calculated using Debye-Scherrer’s formula was ~35 nm for pure Cu and ~33 nm Cu-SiCnanocomposite. The crystallite structure of Cu and Cu-SiCnanocomposites was fcc (face centered cubic) and the preferred orientation of the plane was (220). The microhardness of Cu-SiCnanocomposite coating increased with increasing SiC nanoparticles concentration in the bath compared to pure Cu coating. The corrosion resistance measurements were performed for the pure Cu and Cu-SiCnanocomposite coatings by electrochemical impedance spectroscopy (EIS) and Tafel polarization techniques. It shows that, Cu-SiCnanocomposites has high corrosion resistance than pure Cu in 3.5wt% NaCl solution.

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Electrophoretic Deposition of Cu-SiO2 Coatings by DC and Pulsed DC for Enhanced Surface-Mechanical Properties

Cited by 12 publications

References 24 publications

High frequency pulse anodising of aluminium: Anodising kinetics and optical appearance

High frequency pulse anodising of aluminium: Anodising kinetics and optical appearance

Structure and properties of pulse electrodeposited Cr–WC coating

Nano SiC Reinforced Copper Nanocomposite by a Simple Electrodeposition Method

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