Modified graphene oxide/waterborne epoxy composite coating with enhanced corrosion resistance

Zhou, Lisheng; Shen, Liming; Chu, Libing; Wu, Jian; Ding, Yujie; Zhong, Beijie; Zhang, Xiaoyan; Bao, Ningzhong

doi:10.1016/j.porgcoat.2022.107100

Cited by 16 publications

(8 citation statements)

References 40 publications

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“…Electrolyte and corrosion ions can penetrate defective areas such as pores and cracks in original WEP coatings, leading to the occurrence of cathodic and anodic reactions of metals. , The electrochemical corrosion reactions at the metal–coating interface are shown in eqs –. Fe → Fe 2 + + 2 e − Fe 2 + → Fe 3 + + e − O 2 + H 2 O + 4 e − → 4 OH − Fe 2 + + 2 OH − → Fe ( OH ) 2 2 Fe 2 + + H 2 O + O 2 → 2 FeOOH + 4 …”

Section: Resultsmentioning

confidence: 99%

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TiO₂ Nanocontainers Coconstructed Using Polymers and Corrosion Inhibitors for Anticorrosion Reinforcement of Waterborne Epoxy Coatings

Jin,

Duan,

Zhan

et al. 2023

ACS Appl. Mater. Interfaces

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Stimulus-responsive coatings can provide active corrosion protection in response to environmental changes, but they have not reached their anticipated application prospects because of the intricate preparation processes of hollow materials and methods for loading corrosion inhibitors. Herein, polyaniline molybdate corrosion inhibitor and polydopamine-wrapped titanium dioxide nanocontainers (named TiO2/PANI-MoO4 2–/PDA) are synthesized via a simple three-step electrostatic assembly technique. Introducing TiO2/PANI-MoO4 2–/PDA nanocontainers in smart waterborne epoxy (WEP) coatings affords the latter with high barriers and long-term corrosion protection. The successful deposition of each layer on the TiO2 nanocontainer surface was validated via Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. Release test results show that the molybdate corrosion inhibitor exhibits notable pH-responsive activity under acidic conditions and slow release in neutral environments, which improves the corrosion resistance of coatings. The addition of synthetic nanocontainers greatly improves the impermeability of WEP coatings. The charge transfer resistance of WEP/TiO2/PANI-MoO4 2–/PDA coatings is 1.79 × 1011 Ω cm2 after 30 day immersion in a 3.5 wt % NaCl solution, which is 3.32 × 105 times higher than that of WEP coatings. WEP/TiO2/PANI-MoO4 2–/PDA coatings remain uniform and reliable, even after 50 days of salt spray exposure. The excellent corrosion protection of WEP/TiO2/PANI-MoO4 2–/PDA coatings is attributed to (1) the enhanced dispersion and compatibility of PDA in the coating for nanocontainers, (2) the combination of phenolic hydroxyl groups of PDA and Fe, which inhibit corrosion activity on the exposed metal surface, and (3) the on-demand release of the MoO4 2– inhibitor, which provides sustained passivation protection. This work proposes a strategy to simplify the preparation of responsive long-term anticorrosion coatings and extend their service lives.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

TiO₂ Nanocontainers Coconstructed Using Polymers and Corrosion Inhibitors for Anticorrosion Reinforcement of Waterborne Epoxy Coatings

Jin,

Duan,

Zhan

et al. 2023

ACS Appl. Mater. Interfaces

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“…The pure epoxy coatings’ low corrosion resistance in a hostile environment is evident by the fact that corrosion products and blisters were noticeably coated around the X-cut after 320 h of immersion (Figure a). On mild steel, the porous and thin epoxy coating layer shows weak force interactions with the metal surface. − On mild steel, it causes the production of pores and microscopic fissures in nonhomogeneous coatings. Because of this, aggressive saltwater species pierce the metal-to-water contact and aid in the breakdown of Fe into Fe 2+ ions.…”

Section: Resultsmentioning

confidence: 99%

Flame Retardant and Anticorrosion Behavior of Multifunctional Epoxy Nanocomposite Coatings Containing Graphitic Carbon Nitride/Silanized HfO₂ Nanofillers for the Protection of Steel Surface in Automobile Industry

Xavier,

S P,

et al. 2023

ACS Chem. Health Saf.

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With the help of (3-trimethoxysilylpropyl) diethylenetriamine (TMSPETA), hafnium(IV) oxide (HfO2), an inorganic nanofiller, was modified. The resulting TMSPETA/HfO2 was then encased in graphitic carbon nitride (GCN) and placed within a pure epoxy resin (EP). The protective behavior of mild steel coated with epoxy in the presence of various concentrations of GCN/TMSPETA-HfO2 was studied using electrochemical methods in seawater environment. It was found that the addition of 0.6 wt % of GCN/TMSPETA-HfO2 to the epoxy resin produced maximum resistance. Hence, the optimum concentration of 0.6 wt % was utilized for further investigation. The PHRR and THR values for the GCN/TMSPETA-HfO2 significantly decreased by 73% and 57%, respectively, as compared to pure EP, showing that the material is more flame retardant. The results of salt spray tests showed that the inclusion of GCN/TMSPETA-HfO2 in the epoxy matrix enhanced the corrosion protection performance and reduced water absorption. EIS measurements showed that the epoxy-GCN/TMSPETA-HfO2 had increased coating resistance of 6.42E9 Ω·cm2 even after 320 h of exposure to seawater. According to SECM investigations, the coated steel with EP-GCN/TMSPETA-HfO2 nanocomposite has the lowest ferrous ion dissipation (1.0 I/nA). FE-SEM/EDX investigation revealed that silanized GCN was enhanced in the degradation products, resulting in a durable inert nanolayered covering. The newly created EP-GCN/TMSPETA-HfO2 coating was incredibly water-resistant, with a WCA of 165°. The TMSPETA-HfO2 wrapped in GCN has demonstrated strong adhesion and hardness in the epoxy substrate as well as good mechanical properties. An increased adhesive strength (19.1 MPa) was achieved for mild steel coated with EP-GCN/TMSPETA-HfO2 prior to being immersed in seawater. As a result, the coating has greater adhesive strength and can hold up even after a prolonged immersion. In light of this, the EP-GCN/TMSPETA-HfO2 nanocomposite may be used as a coating component in the automotive industry.

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“…Throughout the curing process, it is inevitable for WEP to acquire microscopic pores and fractures, which have a detrimental effect on their ability to operate as effective barriers. Consequently, these coatings become incapable of providing long‐lasting corrosion protection to surfaces of steel 1,3,8,9 . To augment the anticorrosion properties of these coatings, researchers have recently integrated inorganic compounds and metal oxides into WEP 10–13 .…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, these coatings become incapable of providing long-lasting corrosion protection to surfaces of steel. 1,3,8,9 To augment the anticorrosion properties of these coatings, researchers have recently integrated inorganic compounds and metal oxides into WEP. [10][11][12][13] One of the major method for mitigating the shortcomings of WEP entails enhancing its performance by integrating fillers to create an internal shielding layer within the coating.…”

Section: Introductionmentioning

confidence: 99%

Synergistic enhancement of polyvinylpyrrolidone‐modified TiO₂ and graphene oxide on the corrosion resistance of waterborne epoxy

Xu,

Yang,

Feng

2023

J of Applied Polymer Sci

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Waterborne epoxy (WEP) resins have garnered significant interest due to their potential application as anticorrosion coatings for steel materials. However, it has been reported that defects in the cured coatings generated during the curing process lead to the level of anticorrosion not meeting the expected effects. In this study, TiO2 and GO were selected to be modified by polyvinylpyrrolidone (PVP) to obtain PT and PG, and used to improve the anticorrosion performance of WEP. The obtained PT and PG were characterized using Fourier transform infrared, Raman, and x‐ray photoelectron spectroscopy. The morphology of PT and PG before and after modification was observed using scanning electron microscopy, and the differences were described. The analysis results of laser confocal scanning microscopy and water contact angle (WCA) indicate that there are differences in surface roughness and WCA of the WEP coatings with or without PT and PG. Electrochemical impedance spectroscopy was used to evaluate the anticorrosion performance of the coatings. The results showed that WEP coatings containing PT and PG exhibited better anticorrosion performance. The synergistic enhancement of PT and PG on the anticorrosion performance was proposed, which can be attributed to the comprehensive effect of the hydrophobicity of the coating surface and the barrier effect of PT and PG within the coatings.

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Modified graphene oxide/waterborne epoxy composite coating with enhanced corrosion resistance

Cited by 16 publications

References 40 publications

TiO₂ Nanocontainers Coconstructed Using Polymers and Corrosion Inhibitors for Anticorrosion Reinforcement of Waterborne Epoxy Coatings

TiO₂ Nanocontainers Coconstructed Using Polymers and Corrosion Inhibitors for Anticorrosion Reinforcement of Waterborne Epoxy Coatings

Flame Retardant and Anticorrosion Behavior of Multifunctional Epoxy Nanocomposite Coatings Containing Graphitic Carbon Nitride/Silanized HfO₂ Nanofillers for the Protection of Steel Surface in Automobile Industry

Synergistic enhancement of polyvinylpyrrolidone‐modified TiO₂ and graphene oxide on the corrosion resistance of waterborne epoxy

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Modified graphene oxide/waterborne epoxy composite coating with enhanced corrosion resistance

Cited by 16 publications

References 40 publications

TiO2 Nanocontainers Coconstructed Using Polymers and Corrosion Inhibitors for Anticorrosion Reinforcement of Waterborne Epoxy Coatings

TiO2 Nanocontainers Coconstructed Using Polymers and Corrosion Inhibitors for Anticorrosion Reinforcement of Waterborne Epoxy Coatings

Flame Retardant and Anticorrosion Behavior of Multifunctional Epoxy Nanocomposite Coatings Containing Graphitic Carbon Nitride/Silanized HfO2 Nanofillers for the Protection of Steel Surface in Automobile Industry

Synergistic enhancement of polyvinylpyrrolidone‐modified TiO2 and graphene oxide on the corrosion resistance of waterborne epoxy

Contact Info

Product

Resources

About

TiO₂ Nanocontainers Coconstructed Using Polymers and Corrosion Inhibitors for Anticorrosion Reinforcement of Waterborne Epoxy Coatings

TiO₂ Nanocontainers Coconstructed Using Polymers and Corrosion Inhibitors for Anticorrosion Reinforcement of Waterborne Epoxy Coatings

Flame Retardant and Anticorrosion Behavior of Multifunctional Epoxy Nanocomposite Coatings Containing Graphitic Carbon Nitride/Silanized HfO₂ Nanofillers for the Protection of Steel Surface in Automobile Industry

Synergistic enhancement of polyvinylpyrrolidone‐modified TiO₂ and graphene oxide on the corrosion resistance of waterborne epoxy