Grain boundary engineering in Ni-carbon nanotube composite coatings and its effect on the corrosion behaviour of the coatings

Jyotheender, K. Sai; Gupta, Abhay; Srivastava, Chandan

doi:10.1016/j.mtla.2020.100617

Cited by 39 publications

(12 citation statements)

References 43 publications

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“…Broader peaks in Ni-rGO coatings is attributed to the decrease in the grain size of the Ni matrix due to the incorporation go rGO. The indexed crystallographic planes in both nickel and Ni-rGO coatings are well agreed with the literature [10][11][12]. The absence of rGO crystallographic planes in Ni-rGO coating is due to a small amount of rGO incorporated into the nickel coatings.…”

Section: Resultssupporting

confidence: 87%

“…Although nickel coatings exhibit extraordinary corrosion resistance properties, researchers have been still looking to improve these properties by incorporating microand nano-structured materials as a second phase into the Ni matrix [6][7][8][9][10]. It has been proved that the inclusion of carbon-based nanostructures like graphene oxide [7][8][9], graphene [10][11][12], and carbon nanotubes [13] during coating improves the corrosion resistance of Ni on steel which provides a hydrophobic barrier between the metal and aggressive corrosion environments [13].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Corrosion Behaviour of Nickel and Nickel-Reduced Graphene Oxide Coatings on Mild Steel in 3.5% NaCl Solution

Dharanendra¹,

M²,

Sekharappa³

et al. 2022

ECS Trans.

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Nickel-based electrodeposits are extensively used to protect mild steel. The graphene-based materials as corrosion resistive coatings for metallic substrates have been attracted researchers due to their ability to prevent the metal surface. Herein, nickel and nickel reduced graphene oxide (Ni-rGO) composite coatings have been electrodeposited on mild steel using sulphate bath solution. The morphological results reveal that the Ni-rGO coatings exhibited a smaller grain size with less surface defects. It was observed from the scanning electron micrographs images that composite coatings are porous free. The anti-corrosion properties of coatings were further examined by salt spray test. The electrochemical polarization and impedance measurements revealed that Ni-rGO coating enhances the corrosion resistance of mild steel. Electrochemical measurements revealed that the insertion of a few-layered rGO to the Ni matrix increases the corrosion resistance properties of the Ni-rGO coatings.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Electrochemical Corrosion Behaviour of Nickel and Nickel-Reduced Graphene Oxide Coatings on Mild Steel in 3.5% NaCl Solution

Dharanendra¹,

M²,

Sekharappa³

et al. 2022

ECS Trans.

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“…We have noticed that the electrochemical behavior of the composite coatings is very sensitive to the minor addition of the carbonaceous materials. With respect to the corrosion response, we observed, in almost all the cases, that the with continued addition of the carbonaceous additives the corrosion rate decreases monotonically to reach a lowest value before increasing again [8][9][10][11][12][13][14]. This indicates towards the presence of an "optimum" with respect to amount of carbonaceous material which can be incorporated to achieve high corrosion resistance performance.…”

Section: Need For the Optimum Concentration Of Carbonaceous Materialmentioning

confidence: 76%

“…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: 93%

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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“…Modulus and phase values of impedance are often used to evaluate the stability of passivation films. The larger the value of |Z|, the closer the phase angle is to 90°, and the more stable the passivation film [43]. The Bode plot can be divided into three sections based on the excitation frequency.…”

Section: Bode Diagrammentioning

confidence: 99%

Investigation of the corrosion resistance of graphene-nickel composite micro-parts

Suo

Wang

et al. 2022

Mater. Res. Express

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Nickel-based microparts possess a short lifetime owing to their rapid dissolution in corrosive environments. To mitigate this phenomenon, composite microparts of graphene/Ni were prepared using UV-LIGA technology; their corrosion behavior was examined in acid, alkali, and salt solutions as well as after subjecting them to heat-treatment processes. The microstructures were investigated with scanning electron microscopy (SEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Corrosion resistances were characterized through various electrochemical tests and compared with those of pure Ni microparts. The results demonstrate that the surface oxidation layer (i.e.,the protective layer) of the microparts was readily destroyed in NaCl and H2SO4 solutions without the formation of a passivation film; however, a passivation film was formed in the NaOH solution. The corrosion rates of graphene/Ni in NaCl, NaOH, and H2SO4 corrosion solutions were reduced by 73%, 22%, and 84%, respectively, relative to those of pure Ni microparts. This can be primarily attributed to the homogeneous dispersion of graphene in the Ni matrix, which refined the grain size, and the impermeability and chemical stability of graphene, which lengthened the diffusion path of the corrosive medium. In addition, heat treatment of the graphene/Ni microparts at 200 °C increased the corrosion resistance by a factor of nearly one with little change in microhardness, which can be attributed to the removal of internal stress and the increased proportion of CSL grain boundares. Corrosion occurred at the interface between nickel and graphene, lengthening the corrosion path.

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Grain boundary engineering in Ni-carbon nanotube composite coatings and its effect on the corrosion behaviour of the coatings

Cited by 39 publications

References 43 publications

Electrochemical Corrosion Behaviour of Nickel and Nickel-Reduced Graphene Oxide Coatings on Mild Steel in 3.5% NaCl Solution

Electrochemical Corrosion Behaviour of Nickel and Nickel-Reduced Graphene Oxide Coatings on Mild Steel in 3.5% NaCl Solution

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

Investigation of the corrosion resistance of graphene-nickel composite micro-parts

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