Smart inhibition action of layered double hydroxide nanocontainers in zinc-rich epoxy coating for active corrosion protection of carbon steel substrate

Hayatdavoudi, Hadis; Rahsepar, Mansour

doi:10.1016/j.jallcom.2017.04.044

Cited by 83 publications

(18 citation statements)

References 20 publications

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“…The NO x -LDH diffractogram showed defined peaks at 11.32°and 23.10°, related to diffraction by planes (003) and (006), respectively. The diffractogram of NO x -LDH before exposure to saline medium is quite similar to that reported on literature [8,11,21]. The maximum space that a nitrate ion can occupy is 3.80 Å [22].…”

Section: Resultssupporting

confidence: 85%

Performance Evaluation of Layered Double Hydroxides Containing Benzotriazole and Nitrogen Oxides as Autonomic Protection Particles against Corrosion

Pellanda

Neto

Jorge

et al. 2021

International Journal of Polymer Science

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Layered double hydroxides (LDH) are lamellar structures with positively charged laminates and charge-compensating interlayer anions. The ion-exchange capacity of LDHs makes them as promising hosts for corrosion inhibitor anions with stimulus-responsive release and self-healing anticorrosion. In the current work, LDHs loaded with two different corrosion inhibitors (nitrogen oxides and benzotriazole) were evaluated for their ion-exchange capacity and autonomic protection against corrosion on carbon steel. Studies on nitrogen oxide-loaded LDH (NOx-LDH) showed that nitrogen oxides were successfully intercalated in LDH structure, which were released in chloride media. Open Circuit Potential (OCP) results showed that NOx-LDH extract shifted OCP to nobler values, indicating the protection of metal. For benzotriazole-loaded LDH (BTZ-LDH), the results indicated the presence of benzotriazole in the structure, but its release was not observed. OCP results showed no significant increase of carbon steel protection, corroborating with the conclusion that benzotriazole ions did not migrate to metal surface. Considering these results, the insertion of NOx-LDH in an automotive primer was proceeded, under three different concentrations (0.2. 1.0, and 3.0%). Electrochemical impedance spectroscopy (EIS) showed that the more effective NOx-LDH concentration on corrosion delay was 0.2%, which better balanced protection level conferred by LDH with a possible loss on effectiveness of coating due to increase in porosity.

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Section: Resultssupporting

confidence: 85%

Performance Evaluation of Layered Double Hydroxides Containing Benzotriazole and Nitrogen Oxides as Autonomic Protection Particles against Corrosion

Pellanda

Neto

Jorge

et al. 2021

International Journal of Polymer Science

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“…As an impermeable substance, graphene hinders the corrosive substances to pass through. Therefore, the service life of the coating is prolonged [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings

Tian

Chen

2021

Polymers

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In order to improve the corrosion resistance of zinc-rich epoxy coatings and reduce the amount of zinc used, first, graphene oxide (GO) was modified by sulfonated multiwall carbon nanotubes (SMWCNTs) to obtain the modified graphene oxide (SM-GO). The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Raman spectroscopy. Then, four kinds of coatings were prepared, namely pure zinc-rich coating (0-ZRC), graphene oxide-based zinc-rich coating (GO-ZRC), sulfonated multiwall carbon nanotube-based zinc-rich coating (SM-ZRC) and SM-GO-based zinc-rich coating (SG-ZRC). The corrosion resistance of the above coatings was studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), a salt spray test, 3D confocal microscope, and electron scanning electron microscope (SEM). The results indicate that GO is successfully non-covalently modified by SMWCNTs, of which the interlayer spacing increases and dispersion is improved. The order of the corrosion resistance is GO-ZRC > SG-ZRC > SM-ZRC > 0-ZRC. The addition of GO, SMWCNTs, and SM-GO increases the shielding effect and increases the electrical connection between Zn particles and metal substrates, which improves the corrosion resistance. However, SMWCNTs and SM-GO also strengthen the galvanic corrosion, which decreases the corrosion resistance to some extent.

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“…FLDH was synthesized via a hydrothermal heating process (Hayatdavoudi & Rahsepar 2017). In a typical synthesis for producing FLDH with a molar ratio of Zn to Al of 2:1, 50 mL of a solution containing 1 M Zn(NO 3 ) 2 .6H 2 O and 0.5 M Al(NO 3 ) 3 .9H 2 O was added gradually to a 100 mL solution of 1.5 M NaNO 3 under stirring.…”

Section: Preparation Of Fldhmentioning

confidence: 99%

Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions

Davoudli

Saadat

Rahsepar

et al. 2021

Water Science and Technology

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Flake Zn-Al layered double hydroxides (FLDHs) and microspheres of LDH (MLDHs) were fabricated with a simple hydrothermal method to investigate the role of the morphology of Zn-Al LDH for the humic acid (HA) adsorption from synthetic solutions and natural water. The effect of process variables i.e. contact time, initial concentration of HA, pH, and competitive ions on the adsorption was investigated. HA removal mechanism was also studied. The two adsorbents exhibited different adsorption behaviors for HA in the presence and absence of background ions, which may be highly correlated with the various adsorption mechanisms involved. Comparison of the HA removal capacity of these two adsorbents implies the superior adsorption capability of FLDH for removal of HA from synthetic solutions (9.5 mg/g), while the adsorption capacity of MLDH was higher for natural organic matters present in natural water samples containing co-existing ions (8.9 mg/g). The pseudo-second-order kinetics model and Longmuir isotherm model could adequately interpret the HA adsorption process for the studied adsorbents. Both LDHs exhibited good regeneration and recycling abilities.

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Smart inhibition action of layered double hydroxide nanocontainers in zinc-rich epoxy coating for active corrosion protection of carbon steel substrate

Cited by 83 publications

References 20 publications

Performance Evaluation of Layered Double Hydroxides Containing Benzotriazole and Nitrogen Oxides as Autonomic Protection Particles against Corrosion

Performance Evaluation of Layered Double Hydroxides Containing Benzotriazole and Nitrogen Oxides as Autonomic Protection Particles against Corrosion

Study on the Corrosion Resistance of Graphene Oxide-Based Epoxy Zinc-Rich Coatings

Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions

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