ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Improving corrosion resistance of epoxy coatings with 8-hydroxyquinoline loaded imide COF and 3-glycidoxypropyltrimethoxysilane

Shohreh Baniasad, Mehran Hayaty, and Mahdi Shafiei

Department of Applied Chemistry, Malek-Ashtar University of Technology, Isfahan, Iran

E-mail: mehayaty@mut-es.ac.ir

Received: 13 January 2025  Accepted: 24 March 2025

Abstract:

This study focuses on synthesizing an imide-based covalent organic framework (COF) and incorporating 8-hydroxyquinoline (8HQ), a corrosion inhibitor, into the COF structure to enhance corrosion protection in epoxy coatings. The COF was synthesized via the self-assembly of melamine and pyromellitic dianhydride, and 8HQ was successfully encapsulated within its pores. Characterization techniques such as XRD, FTIR, BET, and FE-SEM confirmed the formation of the COF and the loading of 8HQ. The COF was then incorporated into an epoxy resin, improving the coating’s corrosion resistance, adhesion, tensile strength, and hydrophobicity. Additionally, the long-term performance of the coating was enhanced by the presence of the encapsulated inhibitor. Moreover, the encapsulated inhibitor demonstrated excellent long-term corrosion protection when tested alone or in combination with 3-glycidoxypropyltrimethoxysilane (GPTMS). The superior performance of the Si-8HQ@COF/EP coating can be attributed to the COF’s barrier properties, hydrophobicity, and self-healing abilities. This work demonstrates the potential of COF-based nanocomposites to provide durable and adequate corrosion protection for industrial applications, offering a promising strategy for advanced coating materials with enhanced mechanical and anti-corrosion properties.

Keywords: Coatings; Coating; Corrosion; Coordination Polymer; Metal-organic Frameworks; Organic Molecules in Materials Science; Corrosion resistance; Epoxy composites; Covalent organic framework; Self-healing; Mechanical properties

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-025-04037-0

Chemical Papers 79 (7) 4181–4195 (2025)