Long-term corrosion protection of styrene acrylic coatings enhanced by fluorine and nitrogen co-doped graphene oxide

2021 ◽  
Author(s):  
Haoran An ◽  
Yanan Gao ◽  
Shengyuan Wang ◽  
Shuang Liang ◽  
Xin Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Hydrothermal Process ◽  
Polymer Coatings ◽  
Resin Matrix ◽  
Physical Barrier ◽  
Doped Graphene ◽  
Acrylic Coatings ◽  
Co Doped

Abstract Graphene materials are widely used as a physical barrier when applying anticorrosion polymer coatings due to their large surface area and layered structure. However, the electrical conductivity of intrinsic graphene can accelerate galvanic corrosion and shorten the protection period. In this work, fluorine and nitrogen co-doped graphene oxide (FNGO) was synthesized by a hydrothermal process and acted as an anticorrosion filler in waterborne styrene acrylic coatings. Styrene acrylic coatings with 0.4 wt% FNGO showed a corrosion current density that was two orders of magnitude lower than the other samples in the potential polarization test and the largest impedance modulus in the electrochemical impedance spectroscopy (EIS) results. The outstanding corrosion protection was attributed to the graphene acting as a physical barrier and the synergistic effect of the doped fluorine and nitrogen. In addition to the “labyrinth effect” of the graphene matrix, the nitrogen atoms inserted in the graphene plane and fluorine atoms grafted on the graphene simultaneously adjusted the electrical properties of graphene, prohibiting electron transport between it and the styrene acrylic resin matrix. This result indicates that doped graphene oxide has great potential to increase the corrosion resistance of waterborne coatings.

Outstanding supercapacitor performance of Nd–Mn co-doped perovskite LaFeO3@nitrogen-doped graphene oxide nanocomposites

2020 ◽  
Vol 335 ◽  
pp. 135699 ◽  
Author(s):  
Armin Rezanezhad ◽  
Ehsan Rezaie ◽  
Laleh Saleh Ghadimi ◽  
Abdollah Hajalilou ◽  
Ebrahim Abouzari-Lotf ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Supercapacitor Performance ◽  
Co Doped

scholarly journals Graphene-Based Reinforcing Filler for Double-Layer Acrylic Coatings

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4499
Author(s):  
Massimo Calovi ◽  
Stefano Rossi ◽  
Flavio Deflorian ◽  
Sandra Dirè ◽  
Riccardo Ceccato
Keyword(s):  
Corrosion Protection ◽  
Double Layer ◽  
Abrasion Resistance ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
High Conductivity ◽  
Functionalized Graphene Oxide ◽  
Electron Microscopies ◽  
Joint Application ◽  
Acrylic Coatings

This study aims to demonstrate the remarkable features of graphene-based fillers, which are able to improve the protective performance of acrylic coatings. Furthermore, the joint application of a cataphoretic primer and a spray top coat, containing graphene and functionalized graphene oxide flakes, respectively, enables the deposition of a double-layer coating with high conductivity and abrasion resistance properties, capable of offering excellent corrosion resistance to the metal substrate. The surface morphology of the single- and double-layer coatings was investigated by optical and electron microscopies, analysing the defectiveness introduced in the polymer matrix due to the filler agglomeration. The behavior in aggressive environments was assessed by exposure of the samples in the salt spray chamber, evaluating the blister formation and the adhesion level of the coatings. Electrochemical impedance spectroscopy measurements were employed to study the corrosion protection properties of the coatings, whose conductivity and abrasion resistance features were analysed by conductivity assessment and scrub tests, respectively. The incorporation of graphene-based fillers in the cataphoretic primer improves the corrosion protection properties of the system, while the graphene flakes provide the top coat spray layer with high conductivity and excellent abrasion resistance features. Thus, this work demonstrates the possibility of employing different types of graphene-based fillers and deposition methods for the creation of multifunctional coatings.

Chemically grafting graphene oxide to B,N co-doped graphene via ionic liquid and their superior performance for triiodide reduction

Nano Energy ◽  
2016 ◽  
Vol 25 ◽  
pp. 184-192 ◽  
Author(s):  
Chang Yu ◽  
Haiqiu Fang ◽  
Zhiqiang Liu ◽  
Han Hu ◽  
Xiangtong Meng ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Graphene Oxide ◽  
Superior Performance ◽  
Doped Graphene ◽  
Co Doped

scholarly journals Poly-Phthalocyanine–Doped Graphene Oxide Nanosheet Conjugates for Electrocatalytic Oxidation of Drug Residues

2021 ◽  
Vol 9 ◽  
Author(s):  
Prince Chundu ◽  
Edith Dube ◽  
Ngceboyakwethu P. Zinyama ◽  
Mambo Moyo ◽  
Munyaradzi Shumba
Keyword(s):  
Electron Microscopy ◽  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Dynamic Range ◽  
Electrochemical Impedance ◽  
Cow Milk ◽  
Catalytic Rate Constant ◽  
Donor And Acceptor ◽  
Vis Spectroscopy ◽  
Doped Graphene

Donor and acceptor phthalocyanine molecules were copolymerized and linked to graphene oxide nanosheets through amidation to yield electrocatalytic platforms on glassy carbon electrodes. The platforms were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, UV/Vis spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The fabricated electrochemical catalytic surfaces were then evaluated toward electrocatalytic detection of ascorbic acid and tryptophan. These were characterized by a wide linear dynamic range and low limits of detection and quantification of 2.13 and 7.12 µM for ascorbic acid and 1.65 and 5.5 µM for tryptophan, respectively. The catalytic rate constant was 1.86 × 104 and 1.51 × 104 M−1s−1 for ascorbic acid and tryptophan, respectively. The Gibbs energy for catalytic reactions was −17.45 and −14.83 kJ mol−1 depicting a spontaneous reaction on the electrode surface. The sensor platform showed an impressive recovery when applied in real samples such as fresh cow milk, in the range 91.71–106.73% for both samples. The developed sensor therefore shows high potential for applicability for minute quantities of the analytes in real biological samples.

scholarly journals SiO2-GO nanofillers enhance the corrosion resistance of waterborne polyurethane acrylic coatings

2020 ◽  
Vol 29 ◽  
pp. 2633366X2094152
Author(s):  
Liqi Liu ◽  
Xiaofeng Guo ◽  
Lei Shi ◽  
Liquan Chen ◽  
Fangzhou Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electron Microscope ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Waterborne Polyurethane ◽  
Metal Corrosion ◽  
X Ray Diffraction ◽  
Functionalized Graphene Oxide ◽  
Transmission Electron ◽  
Acrylic Coatings

Corrosion to metal is a great challenge to major industries. Anticorrosive coatings can effectively prevent metal corrosion. In this study, we propose a novel method to prepare silica nanoparticles-covered graphene oxide (SiO2-GO) nanohybrids and anticorrosion SiO2-GO/waterborne polyurethane acrylic (WPUA) coatings. Firstly, we obtained silane-functionalized graphene oxide (A-GO) via a simple covalent functionalization of graphene oxide (GO) with 3-aminopropyltriethoxysilane. Secondly, SiO2-GO was synthesized by a simple sol–gel method with tetraethoxysilane in water–alcohol solution. Finally, the obtained SiO2-GO nanofillers were added into WPUA to prepare SiO2-GO/WPUA coatings. GO, A-GO, and SiO2-GO nanohybrids could be confirmed by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectra, and transmission electron microscope. SiO2-GO nanohybrids showed small size compared with the unfunctionalized GO. Meanwhile, GO, A-GO, and SiO2-GO nanofillers were added into WPUA. The electrochemical impedance spectroscopy and field emission scanning electron microscope indicate that SiO2-GO nanohybrids can be homogeneously dispersed in the WPUA coatings at 0.4% loading level and the SiO2-GO/WPUA film exhibits excellent anticorrosion performance. SiO2-GO nanoparticles can effectively utilize in the area of anticorrosive nanofiller industry. This study provides a convenient method of anticorrosive coating production.

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