Composite Epoxy Coating Reinforced by Silane-modified Micro-Al2O3 Particles for Long-time Anti-corrosion Protection in Solution of Seawater Salinity
Notice bibliographique
Résumé
Marine pipelines in subsea oil and gas production systems are exposed to very corrosive high salinity condition and demand high anti-corrosion coatings. Superhydrophobic particles have long been used to make the rough structure of the superhydrophobic surface for anti-corrosion protection. Epoxy coatings are considered to be one of the best protective method for metals because the epoxy resins have very good chemical resistance, strong adhesion to the substrate, good mechanical and insulating properties. However, the application of epoxy coatings has been limited in many cases due to their characteristics such as brittleness and sensitivity to micro-cracks owing to their three-dimensional network structure, low impact toughness, and poor fatigue property. In recent years, second phase particles for toughening the epoxy matrix have attracted a lot of attention. A noticeable increase in both the shear strength and adhesive peel strength appeared mainly due to high levels of dispersion of the high modulus nanoparticles and effective interfacial interactions with the epoxy matrix. Many studies have reached similar conclusions. So far, numerous studies have been performed to determine the effect of adding reinforcement inorganic particles on the wear and erosion resistance of the epoxy coatings, and the electrochemical characterization of those particle-reinforced epoxy coatings was normally studied for short exposure time. However, no studies have been carried out on the corrosion resistance properties of superhydrophobic particle-reinforced epoxy coatings with long exposure time in corrosive solution. This work aims the development of superhydrophobic micro-Al2O3 as reinforced particles for epoxy coating under long-time exposure to solution of seawater salinity, and comparison of the effects of using hydrophilic and superhydrophobic micro-Al2O3 as reinforced particles on the protection property of epoxy coating. Epoxy composites filled with both silane functionalized Al2O3 (SF-Al2O3) and unfunctionalized Al2O3 (UF-Al2O3) were fabricated at a filler loading of 26 vol.% micro-particles. The SF-Al2O3 particles exhibited a water contact angle of 156.5°. Electrochemical testing including open circuit potential, impedance and phase angle measurements showed that SF-Al2O3 epoxy have better corrosion resistance as compared to pure epoxy after 144 d immersion in solution of seawater salinity (3.5 wt% NaCl), while the coatings with UF-Al2O3 showed failure after 36 d immersion. Scanning electron microscope analysis revealed a very good condition of the SF-Al2O3 epoxy coating after 144 d immersion. It is clearly observed that silane-modified particles were very effective on the anti-corrosion protection property of composites in high salinity solution. The results may have important implications for the design of particles reinforced polymeric composite coatings.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».