Formulation of a smart nanocomposite coating with pH-responsive loaded halloysite and investigation of its anticorrosion
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Formulation of a smart nanocomposite coating with pH-responsive loaded halloysite and investigation of its anticorrosion behaviour A R HOSEINZADEH and S JAVADPOUR∗ Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz 71964-84334, Iran ∗ Author for correspondence ([email protected]) MS received 28 November 2019; accepted 27 April 2020 Abstract. In this research study, halloysite nanotubes (HNTs) were applied as nanocontainers to encapsulate the synthesized 3,4 -dihydro-3-[2 -mercaptothiazolidine]indol-2-one (DMI) molecules for corrosion protection of carbon steel in a 3.5% NaCl solution. Fourier transform infrared analysis was used to prove the loading of HNTs with DMI. Poly(ethylene-coacrylic acid) and branched polyethylenimine polyelectrolyte layers were deposited on the surface of DMI-loaded HNTs by a layer by layer (LbL) method. The LbL deposition technique was verified by a zeta potential test. Release of DMI corrosion inhibitors from HNTs in alkaline pH was verified by using UV–visible spectroscopy results. Electrochemical impedance spectroscopy technique was applied to consider the anticorrosion ability of 1, 2.5 and 5 wt% DMI-loaded HNTs as smart epoxy coatings. Keywords.
Halloysite nanotube; encapsulation; corrosion inhibitor; smart epoxy coating.
1. Introduction Carbon steel is usually used in different industrial environments. Corrosion prevention of carbon steel has been the purpose of many scientific research studies. Corrosion inhibitors have been commonly used to control metal degradation. These molecules adsorb on metal surfaces and decrease the corrosion rate [1,2]. Organic inhibitors are the most commonly used corrosion inhibitors due to their environmental friendliness and cost effectiveness [3]. The corrosion inhibition effect of heteroatoms on organic molecule structures was as follows: O < N < S < P [4]. Another way to prevent metal corrosion is a protective coating that provides a physical barrier to the metal surface against a corrosive environment [5]. Epoxy coating is a thermosetting polymer that has considerable adhesion, mechanical, thermal and corrosion resistance properties. Many researchers combined epoxy resins with nanocontainers to improve these properties [6–10]. Direct addition of corrosion inhibitors to the coatings may cause non-uniform distribution, destructive interactions and leaching of inhibitors from the coatings. Various capsules such as silica nanoparticles [11] and carbon nanotubes [12] were used for loading of active materials. Halloysite nanotubes (HNTs) (Al2 Si2 O5 (OH)4 · 2H2 O) are nontoxic and cheap mineral materials applied for encapsulation of active agents in pharmacology [13] and nanotechnology [14] research. The tubular structure of HNTs provides the entrapment of active molecules. Price and others [15] and Levis and Rand Deasy [16] were pioneer researchers who used loading and smart release of drugs from loaded HNTs into the body. 0123456789().: V,-vol
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