Modification and corrosion resistance of halloysite carrier with metal nanoinhibitor in marine corrosion environment

Abstract

Purpose The purpose of this paper is to provide theoretical guidance and an experimental basis for a smart anti-corrosion coating of halloysite nanocontainers loaded with benzotriazole (BTA) inhibitors on copper in a marine corrosion environment. Design/methodology/approach In the present study, the smart anti-corrosion coatings of halloysite nanocontainers loaded inhibitors on copper were synthesized by adding BTA inside the halloysite nanocontainers. Then, the halloysite carrier’s surface topography and composition in the halloysite were observed using scanning electron microscopy. After the successful synthesis of the coating, the inhibitor’s physical and chemical properties, as well as the mass change in halloysite, were evaluated in terms of temperature fluctuation and time using thermal gravity analysis (TGA). Finally, electrochemical impedance spectroscopy was used to check the pH selectivity for the self-releasing of BTA out of the nanocontainers. Findings The results indicate that the efficiency of the nanotubes was enhanced by calcination at high temperatures. The thermal gravity analysis by TGA shows that halloysite nanoparticles store inhibitors BTA and there are approximately 37.39 Wt.% BTA loaded in each nanocontainer. The release of the preloaded BTA from the halloysite nanocontainers is pH 7 in a 3.5% NaCl solution. Originality/value The development of a new environmentally safe coating for corrosion protection of metallic surfaces has attracted great interest in material science over the past few years. At present, halloysite nanotubes (HNTs) have become a research hotspot internationally and are widely used in nanocomposites, catalysis, nanofiltration, drug sustained-release and other fields. However, the application of HNT is limited by its modification methods. As the carrier of metal nanocorrosion inhibitor in the Marine corrosive environment, the modification research of HNT still needs to be further studied and improved so as to expand the practical application of HNT in the Marine corrosive environment. In this paper, the modification of HNTs was investigated and observed. Four different modification schemes were used to observe and compare the structural properties of the nanotubes under different conditions so as to provide a theoretical basis for the further loading of HNTs as corrosion inhibitors.

Recent progress of self-healing polyaniline organic composite coatings: active agents, methods and protection mechanism

“…Furthermore, the exemplary characteristics of one-dimensional CNTs, characterized by a hollow tubular structure, including a vast specific area, a high aspect ratio and excellent thermal and chemical stability, make them ideal for various organic coating applications. Additionally, halloysite nanotubes (HNTs), with their hollow tubular structure, high aspect ratio, natural abundance and versatile functionality, hold significant benefits for loading corrosion inhibitors (Wang et al, 2022;Liu et al, 2022b). They are capable of absorbing inhibitors within their interior pores.…”

Complex films formed on Al alloy surface via vapor phase assembly of benzotriazole and dodecyltrimethoxysilane

“…BTA is the specific corrosion inhibitor for copper and its alloy. It is also reported that BTA has corrosion inhibition effect for Al alloy and carbon steel (Ren et al , 2022; Petrunin et al , 2020; Wang et al , 2022).…”

Preparation, anticorrosion and antifouling behavior of halloysite-loaded nanocomposite with CAP and BTA

“…Such as silica (Liu et al , 2022; Nguyen et al , 2022), carbon nanotubes, halloysite (HNTs), graphene and montmorillonite (Xing et al , 2018a, 2018b; Matangouo et al , 2021), which have great potential as nanocarriers for continuous drug delivery. HNTs have become one of the most widely used drug nanocarriers because of their low price and good biocompatibility (Barman et al , 2020; Wang et al , 2022). The molecular structure of HNTs is Al 2 O 3 ·2SiO 2 ·4H 2 O.…”