Role of the Hybrid Addition of Carbon Nanotubes and Graphene Nanoplatelets on the Corrosion Behavior of Plasma‐Sprayed Aluminum Oxide Nanocomposite Coating
Abstract:The effect of synergistic reinforcement of two types of carbon nanofillers, carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs), on the corrosion behavior of plasma‐sprayed alumina (Al2O3) nanocomposite coating in 3.5 wt% NaCl solution is studied. Incorporation of 1 wt% CNT and 0.5 wt% GNP into the Al2O3 matrix reduces the corrosion current density of the matrix from 2.78 to 0.21 μA cm−2, which drastically leads to a 13 times reduction in the corrosion rate of the Al2O3 matrix as compared with pure Al2O3… Show more
“…At this time, the resistance of the graphene-modified anticorrosion coating is 15517 Ω, and the graphene-modified anticorrosion coating has better corrosion resistance, which is consistent with the polarization curve. The inductive arc resistance appears in the Nyquist curve in the preparation state and the addition of rGO at 0.2% and 0.8%, indicating that the corrosion ion Clhas appeared on the surface of the oxide film of the aluminum alloy substrate [24,25].…”
Section: Electroactivity Of Anticorrosionmentioning
Graphene-modified anticorrosion coatings have become a hot spot in the field of metal protection due to the large-scale promotion of aluminum alloys, which are prone to corrosion in marine and atmospheric environments. The protection of aluminum alloy surfaces by a graphene-modified anticorrosive coating was explored in this study by applying a graphene-modified anticorrosive coating to an aluminum alloy surface to test its resistance to corrosion. Dispersion-treated reduced graphene oxide (rGO) was used to modify the epoxy resin and fluorocarbon resin. It was found, by using a scanning electron microscopy (SEM) and the microstructure of the coating made by the Raman Spectroscopy Institute, that the addition of rGO could effectively improve the porosity of the epoxy primer, and the electrochemical workstation was able to resist the graphene-modified anticorrosive coating. The corrosion performance was quickly characterized, the polarization curve and the AC impedance curve were fitted, and it was found that the self-corrosion current density (
J
corr
) of the graphene-modified anticorrosive coating was the smallest (
1.190
×
10
−
7
A
/
c
m
2
) when 0.6% of rGO was added; the impedance modulus (
∣
Z
∣
) was the largest (104), the capacitive reactance arc radius was the largest, and the coating resistance was the largest after fitting (15517 Ω). When 0.8% of rGO was added, the dispersion coefficient was large, and it had a good physical insulation performance. The main reason for the reduction of the corrosion resistance was that the agglomeration of rGO made the aluminum alloy matrix and the external corrosive environment form a highly conductive circuit, thereby accelerating the corrosion of the aluminum alloy matrix.
“…At this time, the resistance of the graphene-modified anticorrosion coating is 15517 Ω, and the graphene-modified anticorrosion coating has better corrosion resistance, which is consistent with the polarization curve. The inductive arc resistance appears in the Nyquist curve in the preparation state and the addition of rGO at 0.2% and 0.8%, indicating that the corrosion ion Clhas appeared on the surface of the oxide film of the aluminum alloy substrate [24,25].…”
Section: Electroactivity Of Anticorrosionmentioning
Graphene-modified anticorrosion coatings have become a hot spot in the field of metal protection due to the large-scale promotion of aluminum alloys, which are prone to corrosion in marine and atmospheric environments. The protection of aluminum alloy surfaces by a graphene-modified anticorrosive coating was explored in this study by applying a graphene-modified anticorrosive coating to an aluminum alloy surface to test its resistance to corrosion. Dispersion-treated reduced graphene oxide (rGO) was used to modify the epoxy resin and fluorocarbon resin. It was found, by using a scanning electron microscopy (SEM) and the microstructure of the coating made by the Raman Spectroscopy Institute, that the addition of rGO could effectively improve the porosity of the epoxy primer, and the electrochemical workstation was able to resist the graphene-modified anticorrosive coating. The corrosion performance was quickly characterized, the polarization curve and the AC impedance curve were fitted, and it was found that the self-corrosion current density (
J
corr
) of the graphene-modified anticorrosive coating was the smallest (
1.190
×
10
−
7
A
/
c
m
2
) when 0.6% of rGO was added; the impedance modulus (
∣
Z
∣
) was the largest (104), the capacitive reactance arc radius was the largest, and the coating resistance was the largest after fitting (15517 Ω). When 0.8% of rGO was added, the dispersion coefficient was large, and it had a good physical insulation performance. The main reason for the reduction of the corrosion resistance was that the agglomeration of rGO made the aluminum alloy matrix and the external corrosive environment form a highly conductive circuit, thereby accelerating the corrosion of the aluminum alloy matrix.
A tritium permeation barrier on the surface of structural materials can effectively solve the problem of tritium fuel penetration and leakage. Herein, SiO2/α‐Al2O3 ceramic coatings are prepared on 316L stainless steel through slurry spin coating method. Different particle sizes of α‐Al2O3 powder are used to prepare three kinds of coatings. The particle sizes of α‐Al2O3 used are 30 nm (sample 1), 200 nm (sample 2), and equal mass ratio of 30 nm and 200 nm mixed (sample 3), respectively. The results show that the ceramic coating is composed of α‐Al2O3 and amorphous SiO2. The coating surface of sample 3 is uniform and compact and exhibits the best microstructure. Compared with samples 1 and 2, sample 3 has better thermal shock resistance. The binding strength of sample 3 is up to 69 N. Electrochemical hydrogen penetration tests indicate that SiO2/α‐Al2O3 ceramic coating can effectively improve the electrochemical hydrogen resistance of 316 L stainless steel substrate. Sample 3 has the lowest stable hydrogen penetration current density and current density difference value. Although the hydrogen resistance of sample 3 is reduced after 50 thermal shocks, it is still better than that of the substrate.
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