Correlation between water diffusion and adhesion loss: Study of an epoxy primer on steel

Legghe, E.; Aragon, E.; Bélec, L.; Margaillan, André; Mélot, Denis

doi:10.1016/j.porgcoat.2009.08.001

Cited by 94 publications

(32 citation statements)

References 32 publications

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“…Figure B shows water sorption data of coatings C1 and C2 measured via immersion technique. Several researchers have investigated the water sorption properties of bulk epoxy thermosets and fully formulated epoxy‐based coatings , and found a range of water sorption and transport behaviors that were influenced by a multitude of factors such as polymer chemistry, substrate, pigments, and residual solvents. In general, DGEBA‐based epoxy resins exhibit total water uptake of 0.5–5 wt%.…”

Section: Resultsmentioning

confidence: 99%

Amidoamine: Synthesis, disparity in cure with epoxy resins between bulk and solvent systems, and structure–property relationships of its epoxy‐based coatings

Pramanik

Early

Wand

et al. 2018

Polymer Engineering & Sci

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Amidoamines are widely used as crosslinkers for epoxy resins in protective coatings on metal substrates; however, their cure chemistry is not well elaborated in the technical literature. During cure, the epoxy–amine and epoxy–amide NH reactions could be accompanied by epoxy–hydroxyl etherification, epoxy–epoxy homopolymerization, and reaction between hydroxyls and amide moiety to form in situ ester and amine. To understand the epoxy–amidoamine cure chemistry and correlate it with coating performance properties, amidoamines of known structure are required. Therefore, amidoamines were synthesized by reacting dimer fatty acids with diethylene triamine. When these amidoamines were cured with epoxy resins, discrepancies were observed between systems cured at ambient and thermal conditions. The presence of solvents were seen to greatly affect the rate of epoxy–amidoamine cure at ambient, and before and after vitrification. Near‐IR and mid‐IR spectroscopy studies indicated that side reactions occurred to some extent during cure. No reaction was noted between the amide NH moiety and the epoxide group below 150°C whereas ester formation was noted above 120°C. Solvent‐based clear epoxy–amidoamine coatings formulated at an epoxy:amine equivalent ratio 1.15 passed basic organic coatings evaluation tests. POLYM. ENG. SCI., 59:E69–E81, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Amidoamine: Synthesis, disparity in cure with epoxy resins between bulk and solvent systems, and structure–property relationships of its epoxy‐based coatings

Pramanik

Early

Wand

et al. 2018

Polymer Engineering & Sci

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“…The pull-off adhesion strength after removal of the deposit layer was 17.8 MPa and did not fracture within itself or from the substrate. The result indicated that the bulk adhesion strength of the coating was not affected after exposure to the alkaline environment [23]. Figure 12 shows the Bode plot of the coating before and after exposure to 5% NaOH for 30 days at 93 ∘ C/200 ∘ F, determined using EIS.…”

Section: Dsc Analysismentioning

confidence: 99%

Effect of High Temperature Sodium Hydroxide Immersion on Fusion Bond Epoxy Coating

Al-Borno¹,

Chen²,

Dhoke³

2015

International Journal of Corrosion

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Fusion Bond Epoxy (FBE) coating system was exposed to 5% sodium hydroxide at elevated temperature for 30 days. The result of exposure showed formation of adhere deposit layer, a discolored zone underneath and remaining un-affected bulk of the coating. The deterioration of the coating was characterized using analytical techniques like scanning electron microscopy (SEM), energy-dispersive X-ray (EDAX) spectroscopy, attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), differential scanning calorimetry (DSC), pull-off adhesion, and electrochemical impedance spectroscopy (EIS). Results obtained indicated chemical deterioration of the coating in the discolored zone and leaching of low molecular weight coating component forming deposit layer. Although the adhesion strength and barrier property were not affected, the polymer matrix in the affected zone undergoes severe changes in its surface microstructure, primary chemical structure, and glass transition temperature. This may inflict serious impairment of the coating functional properties and premature failure of the coating in long term exposure.

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“…Epoxy-based polymers such as FBE are the widely used for gas/oil pipelines because they exhibit high chemical resistance, very low permeability to chloride ions, good mechanical flexibility, strong adhesion to steel, and suitable processing characteristics, leading to improved corrosion protection and operational lifetime of the pipelines. However, epoxy coatings can easily absorb moisture, and the diffusion of absorbed water into the epoxy-steel interface owing to the presence of hydrophilic hydroxyl groups in the cured network (epoxy/amine reaction) weakens the interfacial adhesion strength between the epoxy and steel in a corrosive environment, causing system failure [11,12]. Thus, the improvement of the adhesion at the steel-epoxy interfaces by using organosilanes primers can be considered an important strategy for inhibiting the corrosion mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Fusion-bonded epoxy composite coatings on chemically functionalized API steel surfaces for potential deep-water petroleum exploration

et al. 2015

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Corrosion of oil and gas pipelines significantly reduces the service life of the pipelines, thus increasing costs, and more seriously, it can cause catastrophic environmental accidents. More recently, the exploitation of oil in ultra-deep seawater fields is facing new technological challenges in material selection owing to the extreme production conditions. Thus, the development of organic coatings as protective layers for steel pipelines is of crucial importance against highly corrosive environments. In this work, fusion bonded epoxy (FBE) coatings were deposited onto chemically functionalized carbon steel surfaces with organosilanes to investigate the potential applications in protection against corrosion and degradation in harsh marine environments. Carbon-steel API 5L X42 (American Petroleum Institute Standard grade) was chemically functionalized with two organosilanes, 3-APTES [(3-Aminopropyl)triethoxysilane], and 3-GPTMS [(3-Glycidyloxypropyl)trimethoxysilane], followed by the deposition of FBE composite coatings. The systems were extensively characterized with respect to each component as well as the steel-coating interface. The contact angle measurements and Fourier transform infrared spectroscopy (FTIR) results clearly indicated that the steel surface was effectively modified by the functional amine and glycidyl silane groups, leading to the formation of interfacial covalent bonds with increased hydrophobicity compared to bare steel surfaces. In addition, the morphological and chemical characterizations of FBE by scanning electron microscopy, atomic force microscopy, X-ray diffraction, and FTIR showed that it is composed of an epoxy-based organic matrix of bisphenol-A diglycidyl ether (DGEBA) reinforced with uniformly dispersed inorganic phases of calcium silicates and TiO 2 particles. Moreover, the chemical functionalization of the steel surfaces with amino and glycidyl silanes significantly altered the interfacial forces with the FBE coatings, resulting in higher adhesion strength for 3-APTES-modified steel compared to 3-GPTMS-steel; however, both mostly showed cohesive rupture mode in the FBE component.

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Correlation between water diffusion and adhesion loss: Study of an epoxy primer on steel

Cited by 94 publications

References 32 publications

Amidoamine: Synthesis, disparity in cure with epoxy resins between bulk and solvent systems, and structure–property relationships of its epoxy‐based coatings

Amidoamine: Synthesis, disparity in cure with epoxy resins between bulk and solvent systems, and structure–property relationships of its epoxy‐based coatings

Effect of High Temperature Sodium Hydroxide Immersion on Fusion Bond Epoxy Coating

Fusion-bonded epoxy composite coatings on chemically functionalized API steel surfaces for potential deep-water petroleum exploration

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