Sealing porous anodic layers on AA2024-T3 with a low viscosity benzoxazine resin for corrosion protection in aeronautical applications

Renaud, Antoine; Paint, Yoann; Lanzutti, A.; Bonnaud, Leïla; Fedrizzi, L.; Dubois, Philippe; Poorteman, Marc; Olivier, Marie‐Georges

doi:10.1039/c9ra01970g

Cited by 12 publications

(3 citation statements)

References 33 publications

(45 reference statements)

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“…These results are presented in Table 3. The behavior of the samples CA (citric acid)/1 A•cm −2 and CA (citric acid)/7 A•cm −2 (Figure 1) was observed in AA 2024 and AA 2099, with anodizing treatment evaluated in NaCl [35,36]. Such behavior is attributed to the presence of Cl − ions in the solution [37,38].…”

Section: Cyclic Potentiodynamic Polarization (Cpp)mentioning

confidence: 99%

Corrosion Resistance of Hard Coat Anodized AA 6061 in Citric–Sulfuric Solutions

et al. 2020

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Aluminum is a material widely used in aeronautical and transport industries due to its excellent mechanical and corrosion resistance properties. Unfortunately, aluminum alloys are susceptible to corrosion, which limits their use in some corrosive environments. The aim of this work is to characterize hard coat film fabricated by anodizing in a citric–sulfuric acid system using electrochemical techniques. The anodization process was carried out using an aluminum alloy AA 6061 anodization bath: a mix of citric and sulfuric acid solutions were used. For the anodizing process, two current densities were used, 1 and 7.2 A·cm−2. Anodized specimens obtained under different conditions were exposed to a 3.5 wt.% NaCl solution, and their electrochemical behavior was studied by electrochemical impedance spectroscopy (EIS) and cyclic potentiodynamic polarization (CPP) according to ASTM G106-15 and ASTM G5-13, respectively. Scanning electron microscopy (SEM) was employed to determinate the morphology and thickness of coatings. The results showed improved corrosion resistance in 6061 aluminum anodized in citric–sulfuric acid electrolyte compared to those anodized in sulfuric acid solution.

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Section: Cyclic Potentiodynamic Polarization (Cpp)mentioning

confidence: 99%

Corrosion Resistance of Hard Coat Anodized AA 6061 in Citric–Sulfuric Solutions

et al. 2020

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“…2 Based on the variety of precursors for benzoxazine synthesis, high chemical versatility and flexibility of molecular designs for benzoxazine compounds and the corresponding thermosetting resins have been demonstrated. 3 Consequently, benzoxazinebased resins have shown application potential in sealants, 4 adhesives, 5 halogen-free flame retardants, 6,7 printed circuit boards, 8 biomaterials, and natural renewable materials. 9 Ishida's group published the pioneering work on crosslinked benzoxazines from a bifunctional benzoxazine compound.…”

Section: Introductionmentioning

confidence: 99%

Thermally stable, flame retardant, low‐dielectric constants, and flexible thermosetting resins based on a tetra‐functional benzoxazine compound possessing a cyclic siloxane core

Lee

Liu

2022

J of Applied Polymer Sci

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Cyclosiloxanes possessing organic functional moieties are reactive organic–inorganic hybrids as effective building blocks for preparation of organic–inorganic nanocomposites. In this work, a tetra‐functional benzoxazine compound (cD4‐4Bz) with a cyclosiloxane core has been synthesized, cD4‐4Bz could be considered as a self‐crosslinkable benzoxazine compound and has been utilize in preparation of the corresponding polybenzoxazine‐cyclosiloxane thermosetting resins. The obtained crosslinked polybenzoxazines exhibit good film formability and attractive thermal properties including a thermal stability above 390°C, a glass transition temperature above 400°C, and a char yield of 64.5 wt% at 800°C, and low dielectric constant of 2.74 and a dissipation factor of 0.18 at 10 GHz. The hig char yield also indicates its high flame retardancy with a calculated limited oxygen index of 44. Moreover, cD4‐4Bz is a suitable agent for polymer modification through cocuring reactions with a tetrafunctional cyclosiloxane‐phenol compound, a main‐chain benzoxazine, and a bifunctional benzoxazine compound. One prepared sample has exhibited a high thermal stability above 435°C and a char yield of 72.9 wt%. The high flexibility and variety in the fabrication of high‐performance thermosetting resin have been demonstrated.

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“…However, for most benzoxazine precursors, their thermal ring-opening polymerization usually occurs at a high curing temperature (i.e., over 180 • C) not compatible with several manufacturing processes of materials. This drawback could limit the use of benzoxazine, and it particularly cannot withstand such high temperature heating as surface coatings for several substrates [14][15][16]. Therefore, the search for reaction paths reducing the curing temperature has become one of the main focuses to overcome in this field.…”

Section: Introductionmentioning

confidence: 99%

Cerium Salts: An Efficient Curing Catalyst for Benzoxazine Based Coatings

et al. 2020

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The effect of three different cerium salts (Ce(NO 3 ) 3 ·6H 2 O, CeCl 3 ·7H 2 O and Ce(OOCCH 3 ) 3 ·5H 2 O) on the ring-opening polymerization (ROP) of a model diamine-based benzoxazine (4EP-pPDA) was investigated. With the incorporation of the cerium salts, the curing temperature of 4EP-pPDA is reduced substantially, and the glass transition temperatures of the resulting networks are increased significantly. The three cerium salts exhibit different catalytic activities, which were analyzed by FT-IR, NMR, and energy-dispersive X-ray (EDX). Ce(NO 3 ) 3 ·6H 2 O was found to exhibit the best catalytic effect, which seems to be related to its better dispersibility within 4EP-pPDA benzoxazine precursors.

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Sealing porous anodic layers on AA2024-T3 with a low viscosity benzoxazine resin for corrosion protection in aeronautical applications

Abstract: In this paper, a 4-ethylphenol-para-phenylenediamine (4EP-pPDA) benzoxazine has been applied and cured on previously anodized AA2024-T3 substrates.

Cited by 12 publications

References 33 publications

Corrosion Resistance of Hard Coat Anodized AA 6061 in Citric–Sulfuric Solutions

Corrosion Resistance of Hard Coat Anodized AA 6061 in Citric–Sulfuric Solutions

Thermally stable, flame retardant, low‐dielectric constants, and flexible thermosetting resins based on a tetra‐functional benzoxazine compound possessing a cyclic siloxane core

Cerium Salts: An Efficient Curing Catalyst for Benzoxazine Based Coatings

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