Self-healing behavior of epoxy-based double-layer nanocomposite coatings modified with Zirconia nanoparticles

Sehrish Habib,Amani Hassanein,Ramazan Kahraman,Elsadig Mahdi Ahmed,R.A Shakoor

doi:10.1016/j.matdes.2021.109839

Abstract

This work reports the self-healing behavior of epoxy-based double-layer nanocomposite coatings designed to mitigate corrosion in various industrial applications. Zirconia (ZrO2) nanoparticles were used as a carrier to load separately self-healing agent, polyethyleneimine (PEI), and corrosion inhibitor, imidazole (IM). The loaded ZrO2 nanoparticles with IM and PEI were doped into the epoxy matrix and applied on polished steel substrate to form pre and top layers of nanocomposite coatings, respectively. TEM analysis confirms the almost globular morphology of the zirconia nanoparticles with a particle size of 15–25 nm. The chemical bonding interactions among various species were confirmed through FTIR. The synergistic effect of self-healing agent and corrosion inhibitor in epoxy-based double-layer nanocomposite coatings demonstrated the pH and time dependence release of inhibitor and self-healing agent. A comparative EIS analysis conducted in 3.5 wt% NaCl solution reveals that epoxy-based double-layer nanocomposite coatings demonstrate improved corrosion resistance performance as compared to the blank epoxy and single layer epoxy reinforced coatings. This enhanced corrosion resistance of epoxy-based double-layer nanocomposite coatings can be ascribed to the efficient release of loaded IM and PEI in response to the external stimuli and can be potentially considered to circumvent corrosion in oil & gas and marine applications.

Highlights

Results and DiscussionCorrosion inhibition behaviorMa)orphological andb) structural analysis c) a)a) b) c)Problem Statement and Motivation Surface Modification Techniques Corrosion Protection Mechanism Nanocomposite coating system bb) ) c)c)PEI (c) BET analysis of unmodified ZrO2 and modified ZrO2 with IM and PEI. 1) 2)Figure 3: (1) Thermal stability analysis of unmodified ZrO2, modified ZrO2 (ZrO2-IM, ZrO2-PEI). (2)UV-VIS spectroscopic analysis of a) ZrO2/IM and b) ZrO2/PEI in different pH solutions (2, 5, 7, 9, and 11) at different time intervals (24, 48, 72, and 96 h) in 0.1 M NaCl solution
The breakthrough concept will place epoxy-based coatings into a new level, allowing to boost application of these polymers beyond their state of the art. Very importantly, this will deliver a new technical solution that has implications over a wide array of sectors, in which steel coated parts are the key to the operation
Acknowledgement: This publication was made possible by NPRP Grant 11S–1226-170132 from Qatar National Research Fund

Summary

Introduction

Results and DiscussionCorrosion inhibition behaviorMa)orphological andb) structural analysis c) a)a) b) c)Problem Statement and Motivation Surface Modification Techniques Corrosion Protection Mechanism Nanocomposite coating system bb) ) c)c)PEI (c) BET analysis of unmodified ZrO2 and modified ZrO2 with IM and PEI. 1) 2)Figure 3: (1) Thermal stability analysis of unmodified ZrO2, modified ZrO2 (ZrO2-IM, ZrO2-PEI). (2)UV-VIS spectroscopic analysis of a) ZrO2/IM and b) ZrO2/PEI in different pH solutions (2, 5, 7, 9, and 11) at different time intervals (24, 48, 72, and 96 h) in 0.1 M NaCl solution. A. Shakoor 1,* , Ramazan Kahraman2,*, Elsadig Mahdi Ahmed3 1Center for Advanced Materials (CAM), Qatar University, 2713 Doha, Qatar. Problem Statement and Motivation Surface Modification Techniques Corrosion Protection Mechanism Nanocomposite coating system bb) ) c)c)

Results

Conclusion