The effect of graphene orientation on permeability and corrosion initiation under composite coatings

Shaker, Majid; Salahinejad, E.; Cao, Weiqi; Meng, Xiaomin; Asl, Vahdat Zahedi; Ge, Qi

doi:10.1016/j.conbuildmat.2021.126080

Cited by 20 publications

(14 citation statements)

References 42 publications

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“…[52][53][54] Wide XRD peaks are indicative of the amorphous structure. 55,56 The bonding strength of the silica coating to the spinel substrate was investigated by a nano-scratch instrument. In this test, the indenter (scribing needle is a spherical diamond with a radius of 5 μm) applies a perpendicular load on the sample's surface.…”

Section: Resultsmentioning

confidence: 99%

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Ion beam assisted electron beam vacuum deposition of antireflective SiO₂coating on MgAl₂O₄spinel

Meng

Peng²,

Yao³

et al. 2023

Int J Applied Ceramic Tech

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In this paper, the electron beam vacuum coating method was used to coat a SiO 2 film on an MgAl 2 O 4 spinel substrate. The thickness of the coating was aimed to be 925 nm based on the physics of the antireflection coatings. Atomic force microscope images revealed that the coated silica was 880 nm thick, which is close to the aimed theoretical thickness and had 2.11 nm roughness. It could enhance the transparency of the spinel substrate by being coated on it. The infrared transmittance of the sample coated with SiO 2 film in the range of 3700 nm-4800 nm was measured by a Fourier transform infrared spectrometer and reached 92.5% to 78.5%, which was about 2%-4% higher than that of MgAl 2 O 4 spinel. In addition, it was discovered that the bonding force between the coating and the substrate is determined to be about 200 MPa. The results of this study can be used for further precise design and production of antireflection coatings on the transparent materials that need more transparency.

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Section: Resultsmentioning

confidence: 99%

“…This broad peak is ascribed to the presence of amorphous silica 52–54 . Wide XRD peaks are indicative of the amorphous structure 55,56 …”

Section: Resultsmentioning

confidence: 99%

Ion beam assisted electron beam vacuum deposition of antireflective SiO₂coating on MgAl₂O₄spinel

Meng

Peng²,

Yao³

et al. 2023

Int J Applied Ceramic Tech

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“…Evidently, the composite role of mica and graphene has the capability to improve the adhesion strength to the matrix. Shaker [ 46 ] thought that epoxy/graphene composite coatings were well attached to the substrate and that there were not any gaps. Additionally, the detaching areas increased as the immersion time increased, which further sustained the adhesion results mentioned above.…”

Section: Resultsmentioning

confidence: 99%

“…However, it was not easily wetted or sufficiently dispersed for the excessive graphene due to its huge specific surface area [ 22 ], meaning that the graphene would be randomly distributed in the coating due to the graphene agglomerates decreasing the energy of the system. The increase in the orientation degree between the graphene sheets in the composite coatings and the substrate quickened the diffusion process and flux [ 46 ]. Furthermore, the conductivity between the matrix and the corrosive medium increased, thus forming a good primary cell effect.…”

Section: Corrosion Resistance Mechanismmentioning

confidence: 99%

“…Therefore, when graphene and mica were incorporated into composite coatings, a chemical interaction took place between nano–silica (Mica) and graphene [ 52 ], and the intensity of the C–O stretch in the COOH group and carboxylic functional group was strengthened by the addition of graphene sheets to the epoxy matrix [ 46 ]. Besides serving as a labyrinth physical barrier [ 53 ], graphene also reduced the pore defects in the organic coatings [ 15 ], and the protective properties of the composite coating on the matrix were enhanced.…”

Section: Corrosion Resistance Mechanismmentioning

confidence: 99%

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Corrosion Resistance Mechanism of Mica–Graphene/Epoxy Composite Coating in CO2-Cl− System

Zhu

Wang

et al. 2022

Materials

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The working environment for tubing in oil and gas fields is becoming more and more serious due to the exploration of unconventional oil and gas resources, leading to the increasing need for a protective internal coating to be used in tubing. Therefore, a new mica–graphene/epoxy composite coating with different graphene contents (0.0, 0.2, 0.5, 0.7, and 1.0 wt.%) was prepared to improve the tubing resistance to a corrosive medium, an autoclave was used to simulate the working environment, and an electrochemical workstation assisted by three-electrodes was used to study the electrochemical characteristics of the coating. The results showed that the addition of a certain amount of graphene into the mica/epoxy coating significantly improved the corrosion resistance of the composite coating, and when the graphene content increased, the corrosion resistance of the mica/epoxy coating first increased and then decreased when the corrosion current density of a 35 wt.% 800# mica/epoxy coating with a 0.7 wt.% graphene content was the lowest (7.11 × 10−13 A·cm−2), the corrosion potential was the highest (292 mV), the polarization resistance was the largest (3.463 × 109 Ω·cm2), and the corrosion resistance was improved by 89.3% compared to the coating without graphene. Furthermore, the adhesion of the coating with 0.7 wt.% graphene was also the largest (8.81 MPa, increased by 3.4%) and had the smallest diffusion coefficient (1.566 × 107 cm2·s−1, decreased by 76.1%), and the thermal stability improved by 18.6%. Finally, the corrosion resistance mechanism of the composite coating with different graphene contents at different soaking times was revealed based on the electrochemistry and morphology characteristics other than water absorption and contact angle.

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Impact of Preprocessing of Graphene Additive via Ultrasonication on the Electrochemical Performance of Activated Carbon‐Based Supercapacitors

Chameh,

Shaker,

Shahalizade

et al. 2023

Energy Tech

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This article investigates the influence of the addition method of graphene to activated carbon (AC) on the electrochemical performance of the fabricated electric double‐layer capacitors (EDLCs). To do so, the same graphene material was introduced to the other electrode slurry materials either in the form of a powder (GP) or a suspension (GL). It is discovered that the introduction of graphene already dispersed by ultrasonic waves in a suspension to AC has a better effect on the electrochemical performance of the fabricated EDLCs than directly employing its powder. GL EDLC achieved the highest capacitance of 54 F g‐1 at a current density of 0.05 A g‐1 in an organic electrolyte, which is much better than the GP EDLC (41.9 F g‐1) and about 77% more than AC EDLC. Moreover, after cycling at various current densities (totally 2000 cycles), GL EDLC maintained 28.8 F g‐1 of its capacitance with 99.4% coulombic efficiency at a current density of 1 A g‐1. Finally, GL EDLC exhibited 35.8 and 21.4 Wh kg‐1 energy densities at 50.2 and 1102.8 W kg‐1 power densities, respectively. The better performance of GL EDLC in comparison with GP EDLC is ascribed to better graphene dispersion in the liquid media and separation of graphene sheets to form a larger number of thinner graphene plates, which makes it possible to employ the uttermost capabilities of graphene.This article is protected by copyright. All rights reserved.

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The effect of graphene orientation on permeability and corrosion initiation under composite coatings

Cited by 20 publications

References 42 publications

Ion beam assisted electron beam vacuum deposition of antireflective SiO₂coating on MgAl₂O₄spinel

Ion beam assisted electron beam vacuum deposition of antireflective SiO₂coating on MgAl₂O₄spinel

Corrosion Resistance Mechanism of Mica–Graphene/Epoxy Composite Coating in CO2-Cl− System

Impact of Preprocessing of Graphene Additive via Ultrasonication on the Electrochemical Performance of Activated Carbon‐Based Supercapacitors

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The effect of graphene orientation on permeability and corrosion initiation under composite coatings

Cited by 20 publications

References 42 publications

Ion beam assisted electron beam vacuum deposition of antireflective SiO2coating on MgAl2O4spinel

Ion beam assisted electron beam vacuum deposition of antireflective SiO2coating on MgAl2O4spinel

Corrosion Resistance Mechanism of Mica–Graphene/Epoxy Composite Coating in CO2-Cl− System

Impact of Preprocessing of Graphene Additive via Ultrasonication on the Electrochemical Performance of Activated Carbon‐Based Supercapacitors

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Ion beam assisted electron beam vacuum deposition of antireflective SiO₂coating on MgAl₂O₄spinel

Ion beam assisted electron beam vacuum deposition of antireflective SiO₂coating on MgAl₂O₄spinel