Epoxy nanocomposite coating based on calcium zinc phosphate with dual active/barrier corrosion mitigation properties

Alibakhshi, Eiman; Haddadi, Seyyed Arash; Motlagh, A. Labbani; Ghaderi, Mohammad; Ramezanzadeh, Bahram; Mahdavian, M.; Arjmand, Mohammad; Jalili, Mohammad

doi:10.1016/j.porgcoat.2021.106677

Cited by 14 publications

(8 citation statements)

References 52 publications

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“…However, their toxicity and resulting environmental contamination led to their replacement. , Several alternatives have been tested, among which zinc phosphate, Zn 3 (PO 4 ) 2 , is the most widely applied inhibitive pigment in coatings formulation. Also, phosphate compounds with Zn 2+ coupled with secondary cations have also been applied for the development of coatings to enhance their corrosion inhibition. − Nevertheless, alternatives in the absence of zinc are preferred due to the adverse effects that may be caused by the zinc compounds to the aquatic life. Researchers are actively seeking substitutions to zinc complexes, such as Al, , Sr, Ca, − and ammonium complexes for corrosion inhibition.…”

Section: Introductionmentioning

confidence: 99%

“…Also, phosphate compounds with Zn 2+ coupled with secondary cations have also been applied for the development of coatings to enhance their corrosion inhibition. 25 − 28 Nevertheless, alternatives in the absence of zinc are preferred due to the adverse effects that may be caused by the zinc compounds to the aquatic life. Researchers are actively seeking substitutions to zinc complexes, such as Al, 29 , 30 Sr, 31 Ca, 32 − 34 and ammonium 35 complexes for corrosion inhibition.…”

Section: Introductionmentioning

confidence: 99%

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Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Lamprakou

Weinell

et al. 2023

ACS Omega

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A comparative study between the leaching behavior of inhibitive ions from conventionally pigmented and smart (with encapsulated pigments) epoxy coatings has been conducted. Leaching of calcium phosphate as an inhibitive pigment from epoxy coatings was tested in 3.5 wt % NaCl solution. The results showed that pigment encapsulation contributed to a more uniform and stable coating microstructure based on the Scanning Electron Microscopy–Energy-Dispersive X-ray Spectroscopy (SEM-EDX) analysis and a higher leaching rate of the inhibitive pigment via the Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) analysis, thereby enhancing both the active corrosion protection and the barrier properties of the coating film. This was further verified by the Electrochemical Impedance Spectroscopy (EIS) measurements. After 7 days of immersion in 3.5 wt % NaCl solution, the coating resistance of the smart epoxy coating with mesoporous silica nanoparticle encapsulated calcium phosphate (MSN-CP3%) was 2 × 109 Ω·cm2 compared to 1.1 × 106 Ω·cm2 and 2.6 × 106 Ω·cm2 for the conventional epoxy coatings pigmented with 3 wt % and 5 wt % calcium phosphate (CP3% and CP5%), respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Lamprakou

Weinell

et al. 2023

ACS Omega

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“…Organic silanes of the general formula RnSi(0R’)4-n are compounds capable of being adsorbed on a metal surface, bonding strongly with it through Me–O–Si bonds [ 2 ], and forming thin polymeric self-assembled organosilicon layers. These layers can change the properties of the surface, in particular, by inhibiting the corrosion of metals [ 3 ], especially such metals as iron [ 4 ], steel [ 5 , 6 ], aluminum [ 7 , 8 ], zinc [ 9 ], copper and alloys based on it [ 10 , 11 , 12 ], and other metals [ 13 , 14 , 15 ]. Despite the studies devoted to the inhibition of electrolytic corrosion by surface organosilicon layers [ 3 ], there are no data in the literature on their effect on the atmospheric corrosion of metals; therefore, it is necessary to study the effect of surface organosilicon layers on the corrosion of metals in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Effect of Organosilicon Self-Assembled Polymeric Nanolayers Formed during Surface Modification by Compositions Based on Organosilanes on the Atmospheric Corrosion of Metals

et al. 2022

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Reducing the risks caused by losses due to the atmospheric corrosion of metal structures has been relevant for many years and is an important scientific and technical task. Previously, for this purpose, the preliminary modification of the surface of structural metals with solutions of compositions, based on both individual organosilanes and their mixtures with amine-containing corrosion inhibitors, was proposed. Such treatment leads to the formation of self-assembled siloxane polymeric/oligomeric nanoscale layers on the metal surface, which are capable of changing the physicochemical properties of the metal surface (namely, by reducing the tendency of the metal to corrosive destruction). In this work, annual atmospheric corrosion tests of samples of steel, copper, zinc, and aluminum without protection, and samples modified with compositions based on organosilanes in an urban atmosphere, were carried out. It was established (by the gravimetric method) that the corrosion rate of unmodified (without protection) metals is as follows: steel—0.0022 mm/year; aluminum—0.0015 mm/year; copper—0.00018 mm/year; and zinc—0.00023 mm/year. Using gravimetry and optical microscopy, it was shown that the preliminary modification of metal surfaces with compositions based on organosilanes led to the inhibition of both uniform and local corrosion of metals. The corrosion rates of samples that were modified with one-component compositions decreased by almost two times. The maximum inhibitory effect for the studied systems was demonstrated by mixed binary modifying compositions: mixtures of vinyl- and aminosilane, vinylsilane, and benzotriazole. The corrosion rate decreased for all the studied metals. The minimum effect was observed on zinc (2.5 times) and the maximum inhibition of the corrosion rate was obtained on copper (5.1 times). The mechanism of corrosion inhibition by layers formed as a result of surface modification with two-component mixtures was considered.

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“…can be readily adsorbed on the metal surface via electrostatic attraction 6,7 . Even though some industrial organic corrosion inhibitors have the property mentioned above and exhibit potent inhibition against harsh ions, they suffer from the absence of two other qualities (they might be toxic and expensive) [8][9][10][11] . Hence, it is vital to discover an alternative with all the desirable features.Recently, green organic corrosion inhibitors, including plant extracts 12 , expired drugs 13 , and ionic liquids 14 with effective compounds, have been introduced as a substitution for toxic convectional corrosion inhibitors.…”

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confidence: 99%

mentioning

confidence: 99%

Falcaria vulgaris leaves extract as an eco-friendly corrosion inhibitor for mild steel in hydrochloric acid media

Alimohammadi

Ghaderi

Ramazani

et al. 2023

Sci Rep

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Undoubtedly, metal corrosion is one of the most challenging problems faced by industries. Introducing corrosion inhibitors is a reasonable approach to protecting the metal surface. Due to environmental concerns and the toxicity of industrial organic corrosion inhibitors, researchers are continually exploring acceptable replacements. The current study focused on the application of Falcaria Vulgaris (FV) leaves extract to mitigate mild steel (MS) corrosion in a 1 M HCl environment. The polarization findings demonstrated that the corrosion current density decreased from 264.0 µA/cm2 (for the sample submerged in the blank solution) to 20.4 µA/cm2 when the optimal concentration of 800 ppm of FV leaves extract was added to the acid solution. Electrochemical impedance spectroscopy (EIS) analysis revealed an inhibition efficiency of 91.3% at this concentration after 6 h of immersion. It was determined by analyzing several adsorption isotherms that this corrosion inhibitor obeys the Frumkin isotherm. AFM, FE-SEM, and GIXRD surface analyses also supported the findings that adding FV leaves extract can reduce metal damage by adsorption on the metal surface.

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Epoxy nanocomposite coating based on calcium zinc phosphate with dual active/barrier corrosion mitigation properties

Cited by 14 publications

References 52 publications

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Effect of Organosilicon Self-Assembled Polymeric Nanolayers Formed during Surface Modification by Compositions Based on Organosilanes on the Atmospheric Corrosion of Metals

Falcaria vulgaris leaves extract as an eco-friendly corrosion inhibitor for mild steel in hydrochloric acid media

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