Corrosion mechanism of graphene coating with different defect levels

Wu, Yunying; Zhu, Xinyu; Zhao, Wenjie; Wang, Yanjun; Wang, Chunting; Xue, Qi‐Kun

doi:10.1016/j.jallcom.2018.10.260

Cited by 84 publications

(38 citation statements)

References 36 publications

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“…Galvanic corrosion occurs between them, resulting in a decrease in the corrosion resistance of the coating. In addition, the cathode SM-GO has a high specific surface area, and it is easy to form a "large cathode, small anode" with the anode zinc or metal substrate, which will accelerate corrosion [13,45,46]. Therefore, the corrosion resistance of the SG-ZRC sample is better than that of the SM-ZRC sample, but worse than that of the GO-ZRC sample.…”

Section: Anti-corrosion Mechanismmentioning

confidence: 99%

Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings

Tian

Chen

2021

Polymers

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In order to improve the corrosion resistance of zinc-rich epoxy coatings and reduce the amount of zinc used, first, graphene oxide (GO) was modified by sulfonated multiwall carbon nanotubes (SMWCNTs) to obtain the modified graphene oxide (SM-GO). The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Raman spectroscopy. Then, four kinds of coatings were prepared, namely pure zinc-rich coating (0-ZRC), graphene oxide-based zinc-rich coating (GO-ZRC), sulfonated multiwall carbon nanotube-based zinc-rich coating (SM-ZRC) and SM-GO-based zinc-rich coating (SG-ZRC). The corrosion resistance of the above coatings was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), a salt spray test, 3D confocal microscope, and electron scanning electron microscope (SEM). The results indicate that GO is successfully non-covalently modified by SMWCNTs, of which the interlayer spacing increases and dispersion is improved. The order of the corrosion resistance is GO-ZRC > SG-ZRC > SM-ZRC > 0-ZRC. The addition of GO, SMWCNTs, and SM-GO increases the shielding effect and increases the electrical connection between Zn particles and metal substrates, which improves the corrosion resistance. However, SMWCNTs and SM-GO also strengthen the galvanic corrosion, which decreases the corrosion resistance to some extent.

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Section: Anti-corrosion Mechanismmentioning

confidence: 99%

Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings

Tian

Chen

2021

Polymers

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“…This might be due the fact that the excess alcohol vapours cannot be straightaway removed and allow the formation of excess graphitic layers on substrate with defects [ 37 , 38 ]. To sum up, the optimal growth condition for graphene growth is at 850 °C for 5–6 min, which is more effective to produce bilayer graphene in comparison to the existing methods [ 29 , 31 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

“…According to the authors, the oxidizing agent can permeate through defects in graphene leading to a faster galvanic corrosion for the long term corrosion mesurements [ 27 , 28 ]. Authors suggested that the permeation of oxidising agent creates a corrosion products between copper and graphene which further accelerates the corrosion rate by exfoliation of graphene [ 29 ]. In another works, Ying et al and Yinghao et al demonstrated that double layer graphene can efficiently protect the copper from being corroded in the long term.…”

Section: Introductionmentioning

confidence: 99%

Chemical Vapour Deposition of Graphene for Durable Anticorrosive Coating on Copper

Wen

Foller

et al. 2020

Nanomaterials

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Due to the excellent chemical inertness, graphene can be used as an anti-corrosive coating to protect metal surfaces. Here, we report the growth of graphene by using a chemical vapour deposition (CVD) process with ethanol as a carbon source. Surface and structural characterisations of CVD grown films suggest the formation of double-layer graphene. Electrochemical impedance spectroscopy has been used to study the anticorrosion behaviour of the CVD grown graphene layer. The observed corrosion rate of 8.08 × 10−14 m/s for graphene-coated copper is 24 times lower than the value for pure copper which shows the potential of graphene as the anticorrosive layer. Furthermore, we observed no significant changes in anticorrosive behaviour of the graphene coated copper samples stored in ambient environment for more than one year.

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“…[ 7 ] During the past decade, starting from the early chemical vapor deposition (CVD) graphene, various graphene‐based coatings, comprising graphene thin film coatings and graphene‐based polymer composite coatings, have been prepared and developed. [ 8–12 ] However, enhancements in dispersibility and eliminating localized galvanic corrosion (battery circuits formed at the exposed graphene–metal interface accelerate deterioration of the underlying metal) are needed before graphene can be employed for fabricating high‐performance and long‐lasting anticorrosion coatings. [ 13–15 ] According to the previous works, [ 2,16–18 ] the insulating encapsulation with polymers is an effective strategy to achieve the good dispersion and inhibit corrosion promotion activity of graphene coatings.…”

Section: Introductionmentioning

confidence: 99%

Sequentially Bridged Graphene Sheets for High‐Performance Anticorrosion

Zhao

Shi

Ding

et al. 2021

Adv Materials Inter

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Graphene has been widely studied in metal protection due to its complete impermeability and ultrathin properties. However, it is still a huge challenge to fully use the unparalleled features to design and construct graphene‐based coatings with long‐term anticorrosion properties. Herein, a facile and scalable approach to design an ultrathin bioinspired graphene‐based (B–G–WEP) composite coating through sequential bridging of interfacial interactions and ordered graphene layers, is described. The combination of covalent bonding and π–π stacking greatly increases the graphene sheet ordered alignment and compatibility with epoxy matrix. This optimizes physical barrier effect, penetration resistance to sea water, and resistance to localized galvanic corrosion deterioration. The resultant B–G–WEP coating has a 190‐times reduced corrosion rate as well as a three‐orders increased impedance modulus, and keeps a high protection efficiency of 99.5% after 60 days of immersion tests. Furthermore, the coating damage function and coating damage index also decline by 2.8‐ and 10.7‐fold, respectively. This work provides overall consideration to facile, scalable, practical, high barrier and anticorrosion properties, showing great potential applications for high‐efficiency and durable metal protection.

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Corrosion mechanism of graphene coating with different defect levels

Cited by 84 publications

References 36 publications

Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings

Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings

Chemical Vapour Deposition of Graphene for Durable Anticorrosive Coating on Copper

Sequentially Bridged Graphene Sheets for High‐Performance Anticorrosion

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