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

Abstract

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.

Modified hydroxyapatite improves the corrosion resistance of the epoxy coating

“…WCA is to verify the coating hydrophobic ability, judge the coating after immersion hydrophobicity changes. According to relevant literature, the coating with larger water contact angle has better hydrophobicity 12 . The longer the hydrophobic performance is, the better the reaction time between the corrosive medium and the metal outside the coating can be extended to achieve the effect of long‐term anticorrosion.…”

“…According to relevant literature, the coating with larger water contact angle has better hydrophobicity. 12 The longer the hydrophobic performance is, the better the reaction time between the corrosive medium and the metal outside the coating can be extended to achieve the effect of long-term anticorrosion. It can be seen from Figure 10 and Table 2, the contact Angle drops rapidly from 87.3 to 52 within 30 days of immersion, which directly indicates that the pure epoxy coating becomes more hydrophilic and accelerates the corrosion of the metal substrate.…”

“…Two‐dimensional layered materials have the following characteristics: large specific surface area and good mechanical properties, which promote two‐dimensional materials as an indispensable part of membrane applications and corrosion protection 10,11 . Graphene composites have a wider range of applications than pure grapheme 12 . The substrate is protected by graphene with excellent barrier properties in a corrosive medium without changing the physical properties of the substrate 13–16 .…”

Corrosion inhibition of Q235 steel by epoxy coatings containing FG@ZIF‐8

“…31,32 In the past, a large number of literature have reported the ring-opening polymerization between imidazole rings and epoxy resins, which is also beneficial to improving the compatibility between fillers and resins, increasing the crosslinking density and curing speed of epoxy coatings. [33][34][35] Ramezanzadeh et al 36 synthesized ZIF-8 on graphene oxide (GO) to construct a novel anticorrosion epoxy coating with excellent physical barrier properties and an active anticorrosion effect. This also proves again that ZIF-8 can produce a self-healing effect in the coating.…”

“…Zeolitic imidazolate framework‐8 (ZIF‐8), prepared from zinc (II) salt and 2‐methylimidazole, is a typical metal–organic framework with a topological structure 31,32 . In the past, a large number of literature have reported the ring‐opening polymerization between imidazole rings and epoxy resins, which is also beneficial to improving the compatibility between fillers and resins, increasing the crosslinking density and curing speed of epoxy coatings 33–35 . Ramezanzadeh et al 36 synthesized ZIF‐8 on graphene oxide (GO) to construct a novel anticorrosion epoxy coating with excellent physical barrier properties and an active anticorrosion effect.…”