Structure and properties of epoxy-siloxane-silica nanocomposite coatings for corrosion protection

Abstract

A detailed structural analysis suggests for intermediate TEOS to GPTMS ratios a structure of highly condensed silica-siloxane domains covalently bonded to the embedding epoxy phase. The homogeneous distribution of the quasi-spherical sub-nonmetric silica-siloxane nodes is in agreement with low surface roughness (<5 nm), observed by atomic force microscopy. This dense nanostructure results in high thermal stability (>300 °C), strong adhesion to steel substrate and excellent barrier property in saline solution, with corrosion resistance in the GΩ cm range.

Dual Role of Lithium on the Structure and Self-Healing Ability of PMMA-Silica Coatings on AA7075 Alloy

“…These few micrometer thick coatings present comparable or even better performance than the conventional systems combining primer and topcoat. This is possible due to a large number of potential combinations of inorganic and organic phases and the fine-tuning of synthesis conditions. − Consequently, the optimized material combines several favorable properties necessary for efficient corrosion protection such as low permeability, high adhesion to metallic surfaces, and low intrinsic stress, resulting in coatings with high barrier properties . However, in case of mechanical or corrosive damage of the protective layer, the corrosive attack in the affected zone leads to rapid loss of the structural integrity of the metallic component, eventually with drastic consequences.…”

Synergic enhancement of the anticorrosion properties of an epoxy coating by compositing with both graphene and halloysite nanotubes

“…Among them, the placement of anticorrosive coatings on metallic surfaces seems to be a well‐established strategy for separating metals from external aggressive environments . For this purpose, ceramic coatings, metallic oxide coatings, graphene coatings, organic coatings and organic–inorganic hybrid coatings have been developed. Because organic coatings have many advantages, including a high efficiency and easy operation, they have emerged as a promising anticorrosive protection material for metallic surfaces .…”

Recently Emerging Nanotechnological Advancements in Polymer Nanocomposite Coatings for Anti-corrosion, Anti-fouling and Self-healing

“…Recently evolving nanocoating technology has impacted greatly on paints development with inclusion of properties like self-mending [14] , self-cleaning [15] , anti-scratching [16] , and anti-wearing reppression [17] . Furthermore, smart nanocoatings have proved advantageous in minimizing the effects of corrosion and biofouling on concerned materials.…”