Modified Halloysite Nanotubes Corrosion Inhibitor And Its Application Research

Halloysite nanotubes (HNTs) as a natural nanomaterial have many excellent properties and special structure. However, when the nanotubes were added to the solvent or resin, agglomeration occurred, which limite its scope of application. Therefore, it is particularly important for modification of halloysite nanotubes to improve its dispersion.?-aminopropyl triethoxysilane (APTES) as a common organic modified nano-material can effectively improve the nanomaterials'dispersion in the resin and part of solvent. Due to the special structure (multilayer tubular) of halloysite nanotube, there is only a small amount of hydroxyl groups on the tube surface, resulting in less than expected for modified result.Tetraethoxysilane (TEOS) in the presence of water environment could hydrolyze and condense to form a film wrapping nanotubes, which not only provides more reactive sites for the nanotube surface, but it was also used to encapsulate corrosion inhibitor (benzotriazole triazole, BTA). Then, nanotubes as filler of epoxy resin were used to prepare intelligent anti-corrosion coatings.In this paper, we utilized Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal gravimetric analysis (TG), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray energy dispersive spectroscopy analysis (EDS) and other methods for characterizing the morphology and structure of intermediate products and composites. The results showed that: Successful assembled modified nanotubes can be uniformly dispersed in a portion of the solvent and epoxy resin, and it can improve the toughness of the composite coating; In the presence of corrosive medium condition, experiment used electrochemical impedance spectroscopy (EIS) to monitor corrosion process of intelligent coating. The results show that under the corrosive media (3.5% NaCl solution, pH=3) eroding, TEOS membrane was gradually damaged. Then, the inhibitor (benzotriazole, BTA) gradually released from container for protecting the substrate; scratch test provided a more visual evidence of the releasing corrosion inhibitors for improving protective effect of composite coating on the metal; the use of nano-container packaged three the class of benzotriazole corrosion inhibitors, exploring self-healing theory of corrosion inhibitor protecting coating and obtaining a inhibitor which have better inhibition ability.