Microstructure, morphology and electrochemical properties of ZnFe-Graphene composite coatings

Kumar, Mohan; Rekha, M.Y.; Agrawal, Juhi; Agarwal, Tushar Mani; Srivastava, Chandan

doi:10.1016/j.jallcom.2018.12.354

Cited by 30 publications

(4 citation statements)

References 21 publications

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“…Such information is essential for establishing the role of the additives on local microstructural evolution for corrosion protection. Our investigations have indeed revealed that the incorporation of carbonaceous material has a significant effect on the microstructure of the coating [15][16][17][18][19][20][21][22][23][24][25] with respect to attributes such as grain size, coating growth direction, elemental segregation [22], constitution and relative abundance of high and low angle grain boundaries, ECS Transactions, 97 (7) 473-478 (2020) evolution of special boundaries and strain in the coatings [9,13,14,15]. For example, it is invariably observed that the optimum addition of the carbonaceous additive which leads to the maximum corrosion resistance performance results in the presence of highest fraction of low energy low angle grain boundaries and low energy special boundaries (Σ3 coherent twins) [16].…”

Section: Coating System Percentage Change In the Corrosion Current De...mentioning

confidence: 52%

The Interesting Complicacy of the New Age Metallic Coatings with Carbonaceous Additives

Arora¹,

Srivastava²

2020

ECS Trans.

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It has been well documented that the inertness and impermeability of graphene/graphene oxide and hydrophobicity of carbon nanotubes (CNTs) can be used to protect surfaces from degradation due to corrosion. Direct deposition of these carbonaceous materials to protect large scale structures is however impractical due to obvious high cost and instrumentation related difficulties. One other way to use such carbonaceous additives is to incorporate them in minor quantitates into conventional metallic coatings. The sensitivity of the corrosion response of the composite coatings with minor additions of the carbonaceous materials is well established but there exists a debate about the beneficial or detrimental effect of such addition. In this report, we discuss some of the interesting observations made in our work on metal-graphene/graphene oxide/CNT composite coatings and illustrate that there exists a strong correlation between the additive volume fraction and the coating microstructure which essentially governs the corrosion response.

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Section: Coating System Percentage Change In the Corrosion Current De...mentioning

confidence: 52%

The Interesting Complicacy of the New Age Metallic Coatings with Carbonaceous Additives

Arora¹,

Srivastava²

2020

ECS Trans.

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“…They emphasised that MIL-100(Fe)/Graphene composite can be used as a promising material in the field of microwave absorption. Kumar et al [30] investigated the effects of Zn-Fe/Graphene composite coating materials on electrochemical corrosion. The authors stated that the incorporation of graphene into the Zn-Fe matrix increases the corrosion resistance of the coatings.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the microstructure, hardness and electrical conductivity properties of Fe/Graphene compacts

Altuntaş

Özer

Altuntaş

et al. 2023

Materials Science and Technology

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The effects of graphene nanoplatelets added to pure Fe powders at different rates on microstructure, hardness and electrical conductivity were investigated. Prepared mixed powders were compressed at 700 MPa pressure and sintered at 1250°C. Densities of samples were measured Archimedes technique. Scanning electron microscope was used for microstructure investigations. The hardness was measured according to ASTM E384. Phase types, average crystallite size and dislocation density calculations in sintered samples were made. Electrical resistance measurements were made with the four-point probe measurement technique. Powder mixtures containing ≤5 wt-% graphene nanoplatelets were sintered into compact samples. The smallest grain size, highest dislocation density, highest hardness and electrical conductivity values were obtained in samples containing 2 wt-% of graphene nanoplatelets.

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“…Carbonaceous additives such as carbon nanotubes, graphene, and graphene oxide (GO) have been used increasingly in the fabrication of composite materials to achieve improved mechanical, functional, and corrosion properties. − Incorporation of these carbonaceous materials significantly alter the mechanism of morphological and microstructural evolution of the composites during the synthesis process. − Recently, use of graphene, graphene oxide, and carbon nanotubes in electrodeposited metallic coatings has been widely investigated due to additive-induced significant enhancement in the corrosion properties of the coatings. − Among the three additives, graphene oxide (GO) provides an easy dispersibility in the aqueous electrolytes used in electroplating and hence can be fairly easily embedded in a variety of conventional metallic coatings.…”

Section: Introductionmentioning

confidence: 99%

Single Atom Nucleation of Cobalt over Graphene Oxide: Theory and Experimental Study

Gupta

Srivastava

2020

Langmuir

Self Cite

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Nucleation and growth mechanism of Co electrodeposition over graphene oxide (GO) was studied using cyclic voltammetry (CV) and chronoamperometry techniques. The studies were performed over an aqueous electrolyte containing 10 mM CoSO4·7H2O maintained at an initial pH of 2.5. CV studies established that the deposition mechanism was diffusion-controlled and irreversible. Chronoamperometry studies revealed the presence of three concurrent processes: an initial adsorption current, which indicated adatom layer formation, 3D nucleation and growth of Co islands over GO, and hydrogen evolution over the deposited Co nanoclusters. It was observed that the nucleation rate increased with increasing the overpotential (η) for deposition (from 2.71 × 104 cm–2 s–1 at η = 0.35 V to 3.62 × 106 cm–2 s–1 at η = 0.90 V). Application of the classical theory of nucleation over the chronoamperometry results suggested that the free energy of formation of the critical nucleus was lower than room temperature thermal energy. This indicated that the nucleation and growth process was not activation-controlled but rather a kinetically controlled process. Application of Milchev’s atomistic theory revealed that every single atom of Co deposited over the GO sheet was a supercritical nucleus that could grow into a cluster irreversibly.

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Microstructure, morphology and electrochemical properties of ZnFe-Graphene composite coatings

Cited by 30 publications

References 21 publications

The Interesting Complicacy of the New Age Metallic Coatings with Carbonaceous Additives

The Interesting Complicacy of the New Age Metallic Coatings with Carbonaceous Additives

Investigation of the microstructure, hardness and electrical conductivity properties of Fe/Graphene compacts

Single Atom Nucleation of Cobalt over Graphene Oxide: Theory and Experimental Study

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