中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 7 July 2023 |
（1. Department of Chemistry, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Chennai-602 105, Tamil Nadu, India;
2. Department of Chemistry, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai-600 062, Tamil Nadu, India）
Abstract:The influence of poly(asparagine-co-phenylalanine) (P(Asn-co-Phe)/SnO2) on the protection performance of epoxy coating was investigated. The electrochemical impedance spectroscopy (EIS) analysis indicates the better protection against coating degradation of epoxy (EP)-P(Asn-co-Phe)/SnO2 nanocomposite on tinplate compared to that of pure epoxy coatings. The coating resistance (Rcoat) of the EP-P(Asn-co-Phe)/SnO2 nanocomposite is found to be 3854.70 k？·cm2. The Rcoat of EP-P(Asn-co-Phe)/SnO2 nanocomposite coating is found to be over 38 times greater than that of the EP coating. Scanning electrochemical microscopy (SECM) analysis shows less current distribution for the EP-P(Asn-co-Phe)/SnO2. The analyses of degradation products by XRD and SEM/EDX confirm the influence of functionalized SnO2 particles on the protecting ability of epoxy coating. The hydrophobic nature of the EP-P(Asn- co-Phe)/SnO2 nanocomposite coating (θ=133°) is confirmed by water contact angle measurement. The resultant nanocomposite coatings display enhanced mechanical properties. The results show that the EP-P(Asn-co-Phe)/SnO2 nanocomposite in wells increased the antibacterial activity as compared with pure EP. Therefore, it is concluded that the newly synthesized EP-P(Asn-co-Phe)/SnO2 nanocomposite provides an outstanding barrier and mechanical properties due to the addition of P(Asn-co-Phe)/SnO2 nanoparticles to the epoxy matrix, which obstructs the degradation of materials and assists in prolonging the life of the coated steel.
Key words: tinplate; epoxy; SnO2; nanocomposite coatings; copolymer; thermal stability; hardness
