RGO modified ZnAl-LDH as epoxy nanostructure filler: A novel synthetic approach to anticorrosive waterborne coating

Yu, Dayang; Wen, Shaoguo; Yang, Jingxia; Wang, Jihu; Chen, Yang; Luo, J. L.; Wu, Youtong

doi:10.1016/j.surfcoat.2017.07.053

Cited by 76 publications

(29 citation statements)

References 36 publications

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“…The electrochemical phenomena might have been due to the superior electrical conductivity of the graphene with few layers obtained in this study. The electrons involved in the redox reaction of metal corrosion could be transferred through graphene; this consequently resulted in a smaller I corr and larger impedance modulus …”

Section: Resultsmentioning

confidence: 99%

“…Because epoxy resin coatings (ERCs) possess many advantages, including good corrosion resistance, high mechanical strength, and low shrinkage, they have been extensively used as preferred protective barriers for metallic surfaces . Although water‐based epoxy resins are considered to environmentally friendly, lots of micropores can be generated during the curing process at higher temperature; consequently, this makes it easy for external corrosive media to intrude into the metallic substrate . The introduction of microfillers and nanofillers into water‐based ERCs might be an effective approach for drastically reducing the number of micropores and thus boosting the barrier properties of ERCs.…”

Section: Introductionmentioning

confidence: 99%

“…Graphene with two‐dimensional sp 2 carbon atoms has the configuration of a layered structure, a large surface area, a high electrical conductivity, and excellent chemical stability . The layered structure of graphene can make it effectively impede the diffusion of external corrosive media (e.g., H 2 O, O 2 , and other ions) to metallic surfaces; this enhances the protective functionality of ERCs. Coatings incorporated with graphene nanoplatelets showed a much lower corrosion current density ( I corr ) in potentiodynamic polarization curves; this suggested a higher corrosion resistance than that in coatings without graphene nanoplatelets .…”

Section: Introductionmentioning

confidence: 99%

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Synergic enhancement of the anticorrosion properties of an epoxy coating by compositing with both graphene and halloysite nanotubes

Han

et al. 2019

J of Applied Polymer Sci

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The aim of this research was to improve the corrosion resistance of metal surfaces with polymer coatings. Both graphene and halloysite nanotubes (HNTs) were introduced together into the epoxy resin coating for the enhanced barrier protection of the metallic surface. The anticorrosion behaviors of different coatings were comparatively evaluated by the potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and neutral salt spray (NSS) tests. The potentiodynamic polarization curves showed that the coating containing 0.5 wt % HNTs and 0.8 wt % graphene (H05G08EP) together had the most positive corrosion potential and the minimum corrosion current density. The EIS results revealed that graphene endowed the composite coatings with excellent electrochemical performance for anticorrosive purposes. The NSS tests indicated that H05G08EP endured the longest NSS time. These results suggest that H05G08EP had the best corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergic enhancement of the anticorrosion properties of an epoxy coating by compositing with both graphene and halloysite nanotubes

Han

et al. 2019

J of Applied Polymer Sci

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“…This shows the good barrier properties of epoxy-ZP coating, which could be attributed to the presence of the pigments as well as the epoxy resin. The pigments fill the micro holes and cuts in the epoxy coating, as a result of that the epoxy resin porosity diminishes [25][26][27]. for the standard epoxy coating, after 1 h of exposure it was 9.50 kΩ·cm and then dropped to 5.90 kΩ·cm 2 after 4392 h of exposure.…”

Section: Eis Measurementsmentioning

confidence: 99%

“…This shows the good barrier properties of epoxy-ZP coating, which could be attributed to the presence of the pigments as well as the epoxy resin. The pigments fill the micro holes and cuts in the epoxy coating, as a result of that the epoxy resin porosity diminishes [25][26][27]. The Bode plot is a combination of the Bode magnitude plot and Bode phase plot which shows the magnitude of high frequency and low frequency regions due to coating capacitance and charge transfer process, respectively [23].…”

Section: Eis Measurementsmentioning

confidence: 99%

Dual Component Polymeric Epoxy-Polyaminoamide Based Zinc Phosphate Anticorrosive Formulation for 15CDV6 Steel

et al. 2019

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The present research is focused on a formulation with two active components as an anticorrosive polymer coating for 15CDV6 steel. The dual component formulation (epoxy-zinc phosphate (ZP) coating) consists of a polymeric epoxy resin Bisphenol A diglycidyl ether (DGEBA) cured with a polyaminoamide as a first component and zinc phosphate (Zn 3 (PO 4 ) 2 (H 2 O) 4 ) (ZP) added in 5% by weight as a second component. The anticorrosive performance of the epoxy-ZP coating was evaluated against the standard coating, which consists of only one component, the cured polymeric epoxy resin. The two polymer coatings were evaluated by electrochemical impedance spectroscopy (EIS). The surface morphology was of the two polymer coatings were characterized by scanning electron microscopy (SEM). The coated samples of 15CDV6 steel were tested in a harsh environment of corrosive electrolytes (3 wt % NaCl solution). Under these conditions, a very high impedance value was obtained for 15CDV6 steel coated with the epoxy-ZP coating. Even after exposure for a long period of time (5856 h), the performance was still acceptable, indicating that the epoxy-ZP coating is an excellent barrier. The standard epoxy coating provided an adequate corrosion protection performance for a short period of time, then the performance started to decline. The results were confirmed by surface characterization, a cross-sectional image obtained by optical microscopy for an epoxy-ZP coating applied on 15CDV6 steel exposed for 5856 h to a salt spray test showed that the coating is homogeneous and adheres well to the surface of the steel. So, the coating with a dual component could have great potential in marine applications as anticorrosive for steel.Coatings 2019, 9, 463 2 of 11 coating, the cross-linking density in the coating, and the functional group present on the coating surface which affects the strength of adhesion to the metal surface. Among organic coatings, water-based epoxy coatings are the most attractive due to their unique mechanical properties, superior adhesion to substrate, good thermal stability, excellent corrosion resistance and chemical resistance. In addition, they can be available at a low cost [10,11] and are nontoxic. These attractive properties could be attributed to high the cross-linking density and to the functional groups such as amines and hydroxyl present in the polymer coating [12]. However, long term exposure to corrosive materials, cause partial diffusion of corrosive species into the polymer coating from scratches or inherent pores. Eventually the diffusing materials will reach the metal-coating interface. This causes the initiation of corrosion reactions and slow pealing of the coatings [13][14][15].Using inorganic pigments such as zinc chromate as a corrosion inhibitor has become popular in recent years [16]. They tend to improve the adhesion and anticorrosion performance of organic coatings. A couple of published studies showed that some of the inorganic pigments dissolve in water. The dissolved part tends to undergo oxidatio...

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Development of Aging‐Resistant Coating with Self‐healing and Self‐reporting Properties

2024

Smart Protective Coatings for Corrosion Control

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RGO modified ZnAl-LDH as epoxy nanostructure filler: A novel synthetic approach to anticorrosive waterborne coating

Cited by 76 publications

References 36 publications

Synergic enhancement of the anticorrosion properties of an epoxy coating by compositing with both graphene and halloysite nanotubes

Synergic enhancement of the anticorrosion properties of an epoxy coating by compositing with both graphene and halloysite nanotubes

Dual Component Polymeric Epoxy-Polyaminoamide Based Zinc Phosphate Anticorrosive Formulation for 15CDV6 Steel

Development of Aging‐Resistant Coating with Self‐healing and Self‐reporting Properties

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