Polymer-Clay Nanocomposites for Corrosion Protection

Abstract

Nanoclays have evoked a great deal of attention lately for the preparation of novel nanocomposite materials for several applications. This is attributed to their lamellar structures, which are distinguished by having high in-plane strength and stiffness, as well as a high aspect ratio. Nanocomposites have exhibited an advanced gas and water barrier properties compared to the pristine polymers. Such advancement plays a major role in enhancing the coating industry, specifically for corrosion protection. One main factor attributing to coating failure is its inability to maintain low water and oxygen permeability thought its service life. The penetration of these elements through the coating leads to corrosion initiation under the coating. The addition of clay to polymeric coatings has great potential to improve the corrosion protection performance of the coatings. This chapter will present the recent advancement in the preparation and utilization of clay nanocomposites as enhanced coatings for corrosion protection.

Study on the Self-Repairing Effect of Nanoclay in Powder Coatings for Corrosion Protection

“…In terms of barrier effect, many solid particles, especially those with high aspect ratios, have been used to enhance the protective qualities of coating films and polymer composites [11,15]. This effect is primarily due to the increased tortuosity of transport pathways within the coating and the inhibited ingress and uptake of the corrosive medium (electrolyte) [13,16,17]. Micaceous iron oxide (MIO) and nanoclays are two examples of additives that fall into this category [1,18,19].…”

“…It has been used as a rheological modifier (thickener) and an anti-corrosive additive for waterborne coatings [26][27][28]. Additionally, it serves as a functional filler in various polymer composites for enhancing impermeability [14,16,17,[29][30][31][32][33][34][35][36]. However, its use in powder coatings remains rare.…”

“…Incorporating nanoclay particles with a layered structure into polymers can increase their barrier properties by increasing the tortuosity of the transport pathway for aggressive species, similarly to other lamellar-shaped pigments [1,13,16]. Van der Zwaag also demonstrated that nanoclay could fill moisture-induced cracks in sol-gel-based coatings as an expandable phase [37].…”

Synergistic Effect of Nanoclay and Barium Sulfate Fillers on the Corrosion Resistance of Polyester Powder Coatings

“…We have evaluated the performance of two commercially available montmorillonitebased nanoclays, Claytone ® HT (C1) and CLOISITE ® 30B (C2), as anti-corrosive additives in the polyester/triglycidyl isocyanurate (TGIC) clearcoat powder coating system [7]. Both clays have a layered structure and a high aspect ratio, which can increase the tortuosity of coating films, decrease the permeability, and slow down the electrolyte ingress when the coating is exposed to a corrosive environment [8,9]. Optimal dosages for each additive were determined through systematic incorporation into the coating binder, followed by evaluation using applicable ASTM standards, electrochemical measurements, and surface and structure characterization.…”

Synthesis Polymer Styrene Butadiene Hybrid Latex with Laponite Organoclay as Filler via Emulsion Polymerization Technique for Application in Paper Coating

“…Depending on the interphase force between the polymer and organoclay, effect on different morphology are thermodynamically understood such as intercalated structure, flocculated structure and exfoliated structure [4,5]. [6] To produce good nanocomposites, clays should be treated before being used into the polymer. Since the nature behavior of clay has hydrophilic characteristic, it is difficult to dispersed clays in polymer matrix.…”