Electrodeposited Ni-Co alloy-particle composite coatings: A comprehensive review

Safavi, Mir Saman; Tanhaei, Mohammad; Ahmadipour, Mohammad; Adli, Reza Ghaffari; Mahdavi, S.; Walsh, Frank C.

doi:10.1016/j.surfcoat.2019.125153

Cited by 84 publications

(47 citation statements)

References 119 publications

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“…The included reinforcing nanoparticles can improve the corrosion performance of the Co-P alloy coatings by different mechanisms as follows: (1) deflecting the path of the corrosion medium, (2) formation of micro-galvanic cells, (3) providing a barrier against the diffusion of corrosive agents, and 4eliminating the present nano-holes and nanovoids. [16,63,64] The reason why the inclusion of 6 g/L nanoparticles into the electrolyte degrades the electrochemical behavior can be ascribed to the agglomeration of the embedded nanoparticles. [15,32] Henceforward, the influences of the applied current density will be assessed on the various characteristics of the Co-P/(4 g/L MoS 2 + 4 g/L Y 2 O 3 ) deposit, denoted as Co-P/4 in the rest of the text, to achieve the most favorable outcome and fulfill the industrial demands in this field.…”

Section: Tafel Polarizationmentioning

confidence: 99%

“…Current density has often been found to alter the final characteristics of a composite coating, mainly by changing the amount of co-deposited reinforcements. [16,65] 3. Thickness of the optimum coating The thickness of the Co-P/(4 g/L MoS 2 + 4 g/L Y 2 O 3 ) nanocomposite coatings electrodeposited under 25 A/dm 2 is measured using the FE-SEM image displayed in Figure 4.…”

Section: Tafel Polarizationmentioning

confidence: 99%

“…Another proposed mechanism for such an ascending and descending trend is based on the ability of high current densities to supply the required energy for convection and diffusion of metallic ions. [16,66,67] 2. Morphological evaluations a. FE-SEM The surface morphology of the Co-P alloy deposit at various magnifications is presented in Figure 7.…”

Section: Tafel Polarizationmentioning

confidence: 99%

“…[6][7][8][9][10][11] Ni-based coatings, such as Ni-P, Ni-Mo, and Ni-W, as well as Co-based ones, including Co-P and Co-B, are among the systems suggested for use as a substitute for conventional hexavalent chromium coatings. [12][13][14][15][16][17][18][19] Originating from their suitable properties such as high resistance to both wear and corrosion, appropriate thermal stability, and noticeable hardness, pure Co deposits have attracted broad attention. [20][21][22][23] As for any metallic coatings, it is possible to improve the final properties by optimizing the processing parameters such as current density and electrolyte pH, application of post-treatments, and incorporation of alloying and/or reinforcing agents.…”

Section: Introductionmentioning

confidence: 99%

“…[20][21][22][23] As for any metallic coatings, it is possible to improve the final properties by optimizing the processing parameters such as current density and electrolyte pH, application of post-treatments, and incorporation of alloying and/or reinforcing agents. [16] For instance, the incorporation of an alloying element, e.g., phosphorous, may cause further improvement in the abovementioned properties of pure Co coatings. Practical results have proved that the amount of included phosphorous can change the structure and characteristics of the deposits.…”

Section: Introductionmentioning

confidence: 99%

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Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

Safavi

Fathi

Charkhesht

et al. 2020

Metall Mater Trans A

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During recent decades, CoP alloy deposits have gained enormous attention primarily owing to their favorable tribomechanical properties; therefore, they are regarded as a potential alternative to hard chromium coatings. The previous works on these systems usually addressed the approaches to improve their tribomechanical characteristics. However, to increase the industrial applications, especially in marine environments, enhancement of corrosion performance should also be considered. The focus of this investigation is improving the corrosion properties of CoP deposits through the incorporation of hybrid nanoparticles, i.e., MoS 2 and Y 2 O 3 , as well as controlling the applied current density. Microstructural and morphological aspects of the coatings were characterized by XRD, EDS, FE-SEM, and AFM. While the surface morphology of the CoP alloy deposit contains several surface defects, MoS 2 + Y 2 O 3 reinforced ones are compact and composed of nodular grains. Although there is no change in morphology of the nodular grains with current density variation, the surface roughness increases by increasing the current density from 15 to 25 A dm À2. Influences of both nanoparticle loadings in the electrolyte and the applied current density on the corrosion performance of the deposits are addressed in detail. Overall, the results confirmed that the CoP -4 g/L MoS 2 + Y 2 O 3 nanocomposite coating electrodeposited at 25 A dm À2 has the highest corrosion resistance against 3.5 pct NaCl solution, % 10 times higher than that of CoP .

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Section: Tafel Polarizationmentioning

confidence: 99%

Section: Tafel Polarizationmentioning

confidence: 99%

Section: Tafel Polarizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

Safavi

Fathi

Charkhesht

et al. 2020

Metall Mater Trans A

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Tuning structural properties, morphology and magnetic characteristics of nanostructuredNi‐Co‐Fe/ITOternary alloys by galvanostatic pretreatment process

Saraç

Trong

Baykul

et al. 2022

Microscopy Res & Technique

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In this research, the structural properties, surface morphology, and magnetic characteristics of nanostructured ternary ferromagnetic alloys grown by a cost‐effective and effortless two‐step electrochemical deposition method on indium tin oxide (ITO) substrates with and without a galvanostatic pretreatment process (GPP) were examined. The GPP was applied at various pretreatment current densities (PCDs) such as −10, −20, and − 30 mA/cm2. The effect of the PCD on the Ni, Co, and Fe contents is found to be insignificant and all resultant Ni‐Co‐Fe thin films show an abnormal co‐deposition. The films have nano‐sized crystallites ranging from 17.3 to 19.6 nm and showed a face‐centered cubic structure with the [111] preferential growth. Compared to the non‐GPP applied Ni‐Co‐Fe film, growing the ternary Ni‐Co‐Fe film on ITO at the PCD of −30 mA/cm2 causes an improvement in the crystal quality and a reduction in the particle size from 150 ± 50 to 70 ± 20 nm. A decrement in the surface roughness and coercivity was also achieved by applying the GPP at the PCD of −30 mA/cm2, but the opposite is true for the GPP performed at the PCD of −10 mA/cm2. The GPP has an effect on the magnetic Squareness Ratio (SQR), but the influence of the PCD on the SQR parameter is negligible. The obtained findings reveal that the properties of the Ni‐Co‐Fe/ITO ternary alloys can be tuned through the GPP applied in various PCDs. Highlights • The effect of the PCD on the Ni, Co, and Fe contents is found to be insignificant. • The films have nano‐sized crystallites and showed a face‐centered cubic structure with the [111] preferential growth. • The analysis reveals that the GPP changes the crystal quality, Hc parameter, surface roughness, and particle size of the films. • The GPP has an effect on the magnetic squareness ratio (SQR), but the influence of the PCD on the SQR parameter is negligible. • The films had nano‐sized crystallites ranging from 17.3 to 19.6 nm. • The films were ferromagnetic, and the Hc and SQR parameters of the films ranged from 30.2 to 42.7 Oe and from 8.8% to 19.6%.

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Synthesis of Ni/Co/Ni−G Composite Coatings and Analysis of Their Corrosion Resistance Properties to Q235 Carbon Steel

Xie¹,

Qiao

Wang

et al. 2023

ChemistrySelect

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In this work, nickel-modified graphene nanosheets (NiÀ G) were prepared by hydrothermal method for the first time. The microscopic morphological analysis showed that the nickel nanoparticles were successfully reductively deposited on the surface of NiÀ G with uniform distribution. NiÀ G can be uniformly and stably dispersed in the electrodeposition solution. Then Ni/Co/NiÀ G composite coating was prepared by pulsed current co-deposition method to provide corrosion resistance protection for Q235 carbon steel. The microstructure and morphology analysis of the composite coating shows that NiÀ G were homogeneously incorporated in the coating and the composite coatings were uniform, dense and crack-free. The hardness test results showed that the doping of NiÀ G improved the hardness of the composite coating. The influence of the added amount of NiÀ G in the electrodeposition solution on the anti-corrosion performance of the composite coating was investigated. The electrochemical results illustrated that the composite coating prepared by adding 20 mL NiÀ G dispersion achieved 98.04 % protection efficiency (h EIS ) against carbon steel substrate in 3.5 wt.% NaCl solution, the Ni/Co/NiÀ G20 composite coating has the best corrosion resistance.[a] X. Xie

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Electrodeposited Ni-Co alloy-particle composite coatings: A comprehensive review

Cited by 84 publications

References 119 publications

Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

Tuning structural properties, morphology and magnetic characteristics of nanostructuredNi‐Co‐Fe/ITOternary alloys by galvanostatic pretreatment process

Synthesis of Ni/Co/Ni−G Composite Coatings and Analysis of Their Corrosion Resistance Properties to Q235 Carbon Steel

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