Effects of Incorporating Silanized Nanoclay on the Barrier, Hydrophobic and Mechanical Properties of Epoxy Resin in Chloride Environment

Abstract

propyl methacrylate (TMSPMA) is used to coat the surface of halloysite nanoparticles, resulting in a less hydrophilic clay surface and improved nanoparticle dispersibility in the epoxy polymer (EP). The efficiency of epoxy/clay nanocomposites in terms of thermal, mechanical, and barrier properties was studied. The results of XRD, SEM/EDX, TEM, and TGA all show that halloysite nanoparticles are silanized. EP-TMSPMA/clay coatings have a high degree of hydrophobicity (WCA: 139°) and surface roughness. Electrochemical techniques were used to investigate the corrosion resistance of coated steel substrates. The coating resistance of the EP-TMSPMA/clay nanocomposite coating was found to be over 62.98% higher than the EP coating. Even after 15 days of immersion, electrochemical tests demonstrate that EP-TMSPMA/clay has a higher coating resistance (R coat ) than plain epoxy coated mild steel. At 15 days of immersion, SECM data show that the dissipation of Fe in the EP-TMSPMA/clay coated substrate is significantly lower than the pure epoxy coated substrate. Furthermore, mechanical testing (hardness, adhesion, and tensile strength) revealed that the epoxy/silane/clay nanocomposites had improved mechanical properties. Silanized clay including epoxy nanocomposites has excellent barrier, hydrophobic, and mechanical qualities, as well as excellent oxygen and water repellent capabilities. EP-TMSPMA/clay has the best characteristics of all of the coated nanocomposites examined. Because clay/silanes are environmentally safe, this form of coating could be used as a viable coating material for industrial purposes.

Multilayered nanocomposite coatings for enhanced anticorrosive, flame retardant, and mechanical properties in automobile and aerospace industries

“…The O 2 and H 2 O permeability for 1 h and 20 days immersion are obtained as 0.06 × 10 −2 cc.mm/(m 2 .d.atm): W c —0.11%; 0.12 × 10 −2 cc.mm/(m 2 .d.atm): W c —0.17%, respectively. The permeation rate of O 2 and H 2 O through the alloy was insignificant though immersed coating in seawater for 600 h. It confirms the enhanced covalent interactions between the GO/BAO‐NiS 2 nanocomposites and improved the dispersion in PU matrix 58–60 . The uniformity of the coatings on the alloy surface without any cracks was observed.…”

Enhanced Weathering and Corrosion Resistance of Eu-Doped ZnO Solid Solution Material by Fluorescence Modification

“…Corrosion is a spontaneous free energy-increasing reaction with a self-accelerating effect . The establishment of functional coatings on metal surfaces is a common and effective method of corrosion prevention. − During daily use, the metals exposed to sunlight can also accelerate the corrosion reaction due to solar energy input. At the same time, the strong decomposition disablement of the main components caused by high energy ultraviolet (UV) is a fatal and unavoidable problem in the practical application for corrosion protection coatings. − A common industrial solution to retard photo-aging of coatings is the addition of UV absorbers.…”

Poly(vinyl alcohol)/Kaolin Barrier Films with Superior Dispersion Fabricated by Solid-State Shear Milling and Biaxial Stretching

“…In consideration of safety and cost, natural materials are ideal candidates for PVA reinforcing. Apart from the aforementioned biomass, mineral materials are also a good choice on account of their features of low price, nontoxicity, and extensive source. − For instance, Lazzara et al made use of halloysite clay minerals for the modification of paper, cellulose films, and epoxy resin. − Han et al fabricated hydrotalcite/polymer films for efficient oxygen and water vapor barriers. , Kaolin, an important layered aluminosilicate clay mineral consisting of alternate layers of tetrahedral silicon–oxygen and octahedron aluminum–oxygen, possesses good mechanical properties, thermal stability, chemical resistivity, high specific surface area, and low price, thus having been commonly used in the fields of papermaking, catalyzation, paint, ceramics, plastic industries, and polluted water treatment . Ascribing to its high rigidity and modulus, kaolin is a suitable reinforcing filler for the preparation of polymer composites including PVA-based materials .…”