Effect of organically modified sepiolite as inorganic nanofiller on the anti-corrosion resistance of epoxy coating

Xiong, Hailong; Qi, Fugang; Nie, Zhaogang; Yuan, Hong; Wan, Pengying; Liao, Bin; Ouyang, Xiaoping

doi:10.1016/j.matlet.2019.126941

Cited by 36 publications

(16 citation statements)

References 10 publications

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“…Originally employed mainly in thermoplastic nanocomposites, nanoclays are now also widely employed in epoxy systems with different functions, i.e., as a thermal stabilizer, to supply electrical and optical properties, flame retardancy, biocompatibility, and as scavengers for pollutants. Nanoclays, in addition, are able to confer enhanced mechanical properties, corrosion resistance [ 73 ], and fire resistance to the epoxy matrix of FRP composites based on glass fibers, even at low percentages (1 wt.%) [ 74 , 75 ].…”

Section: Nanofillers For Epoxy Resinsmentioning

confidence: 99%

“…The addition of nanofillers (especially graphene oxide) improves the barrier properties yielding an effective increase in corrosion resistance ( Figure 9 ). In fact, in the nanofilled epoxy coating, the capacitance is usually found appreciably reduced [ 108 ], while the impedance at low frequencies (|Z| 0.01 Hz) is significantly higher in comparison to the neat epoxy resin [ 73 , 125 , 135 ]. In particular, the higher the impedance, the better the corrosion resistance.…”

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

“…Materials 2020, 13, x FOR PEER REVIEW 13 of 25 frequencies (|Z|0.01 Hz) is significantly higher in comparison to the neat epoxy resin [73,125,135]. In particular, the higher the impedance, the better the corrosion resistance.…”

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

“…Corrosion of coated substrates is influenced by absorption and diffusion of the corrosive agent into the coating, which mainly depends on the presence of voids or defects, but also on the adhesion of the coating to the metallic substrate [22,92,122,125]. The corrosion resistance is enhanced when the nanoparticles fill the micro-pores in the epoxy polymer, promoting a tortuous diffusion path, similar to a "labyrinth effect", able to hinder the infiltration of corrosive agents into the coating [70,73,121,125,136]. The highest adhesion strength exhibited by the nanofilled epoxy coatings allows achieving excellent anti-corrosion performance [92,134,137].…”

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

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Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Frigione

Lettieri

2020

Materials

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This paper aims at reviewing the works published in the last five years (2016–2020) on polymer nanocomposites based on epoxy resins. The different nanofillers successfully added to epoxies to enhance some of their characteristics, in relation to the nature and the feature of each nanofiller, are illustrated. The organic–inorganic hybrid nanostructured epoxies are also introduced and their strong potential in many applications has been highlighted. The different methods and routes employed for the production of nanofilled/nanostructured epoxies are described. A discussion of the main properties and final performance, which comprise durability, of epoxy nanocomposites, depending on chemical nature, shape, and size of nanoparticles and on their distribution, is presented. It is also shown why an efficient uniform dispersion of the nanofillers in the epoxy matrix, along with strong interfacial interactions with the polymeric network, will guarantee the success of the application for which the nanocomposite is proposed. The mechanisms yielding to the improved properties in comparison to the neat polymer are illustrated. The most important applications in which these new materials can better exploit their uniqueness are finally presented, also evidencing the aspects that limit a wider diffusion.

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Section: Nanofillers For Epoxy Resinsmentioning

confidence: 99%

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

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Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Frigione

Lettieri

2020

Materials

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“…In addition, particles of ZVI were uniformly distributed between the voids and the fibers of the mineral. XRD analysis of the nanocomposite revealed a distance of 1.22 nm as the interlaminar spacing between layers 33 …”

Section: Resultsmentioning

confidence: 99%

Catalytic ozonation of caffeine with sepiolite: Effects of impregnation with zero‐valent iron and ultrasound

Savun-Hekimoğlu

Eren

Ince

2020

Env Prog and Sustain Energy

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The study is about the oxidative destruction and mineralization of caffeine by catalytic ozonation using sepiolite, which is a low‐cost natural clay mineral found abundantly in Anatolia. The results showed that while ozonation alone at pH 6.0 (the natural pH of the test solution) provided 72% caffeine decay and 18% carbon mineralization during 10‐min and 60‐min reaction, respectively; catalytic ozonation with sepiolite provided 96% conversion and 30% mineralization during equivalent pH and reaction times. The activity of the catalyst was further improved by immobilization of zero‐valent iron (ZVI) on its surface to produce a nanocomposite (ZVI/SEP) with a massive surface area and a much more reactive surface. Integration of the process with high‐frequency ultrasound (US) was found to further enhance the rate of caffeine degradation and the degree of carbon mineralization via the unique properties of ultrasound for enhancing the rate of mass transfer to the catalyst surface and the generation of hydroxyl radicals (HO•) via thermal fragmentation of water molecules in the collapsing cavity bubbles. Maximum process efficiency was obtained under the following optimized conditions: pH = 6.0, O3 (aq.) = 4 mg L−1, SEP/ZVI = 1.0 g L−1, US frequency = 577 kHz, t = 5‐min and 60‐min for 100% caffeine and 57% TOC decay, respectively. The nanocomposite was also highly stable, for it was used consecutively in four cycles without significant loss in activity.

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Preparation and anticorrosion properties of GO‐Ce‐MOF nanocomposite coatings

Chen

Yin

et al. 2021

J of Applied Polymer Sci

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Herein, a new strategy for improving epoxy coatings' anti-corrosion performance has been developed, which combined NH 2 -Ce-MOF with graphene oxide (GO) by hydrothermal method. First, the nanocomposite material's morphology and structure (GO-Ce-MOF) were confirmed by Fourier transform infrared, X-ray diffraction, TG, X-ray photoelectron spectroscopy, and scanning electron microscope (SEM) studies. The dispersity of the composite in the epoxy coating was evaluated by SEM and mapping analysis. Meanwhile, the anti-corrosion of as-prepared composite coatings was investigated in detail by the electrochemical impedance spectroscopy (EIS) and the Tafel polarization curve test. The results illustrated that 2.0 wt% GO-Ce-MOF/EP greatly enhanced the composite coating's anti-corrosion performance compared to other coatings. The reasons for the improvement of the anti-corrosion performance of the composite coating are attributed to the following two aspects: On the one hand, the addition of GO can provide a physical barrier to form a labyrinth effect to slow down the invasion of corrosive media into the metal substrate, on the other hand, the modification of GO can GO-Ce-MOF achieve better compatibility and dispersion in epoxy resin.

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Effect of organically modified sepiolite as inorganic nanofiller on the anti-corrosion resistance of epoxy coating

Cited by 36 publications

References 10 publications

Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Catalytic ozonation of caffeine with sepiolite: Effects of impregnation with zero‐valent iron and ultrasound

Preparation and anticorrosion properties of GO‐Ce‐MOF nanocomposite coatings

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