Development of nanocomposite coatings with improved mechanical, thermal, and corrosion protection properties

Abstract

In this study, new composite coatings are fabricated and investigated for their applications as the metal coating. The studied coatings consist of two-layered composites with various nanoparticulates as fillers in a polymeric matrix (styrene acrylic). The first layer bonded to the steel plate uses a combination of zinc particles, multi-walled carbon nanotubes, and graphene nanoplatelets. For the second layer, hexagonal boron nitride with high electrical insulation properties is added to the matrix. The morphology of the nanoparticulates is conducted using a scanning electron microscope. The coefficient of thermal expansion, cathodic disbondment resistance, gas penetration, and scratch resistance of the coatings are evaluated. The corroded area on the cathodic disbondment test specimens reduced down up to 90% for the composite with zinc (20 wt%), multi-walled carbon nanotubes (2 wt%), and graphene nanoplatelets (2 wt%), compared to a specimen coated with a pure polymer. It is seen that the presence of nanoparticulates decreased gas permeation and thermal expansion of the matrix by 75% and 65%, respectively. The addition of nanoparticulates also enhanced scratch resistance of the coating composites.

Nanocomposite coatings on steel for enhancing the corrosion resistance: A review

“…in their optimum weight % can give rise to enhanced performance to the final nanocomposite coating. Also hybrid composites are preferred to single filler for reducing the filler content, (viii) Two layer coating is a new approach 78 wherein the first layer is electrically conductive and the second layer is electrically insulative (Figure 14(b)). The electrical insulation is for isolating the steel in direct contact with corrosive atmosphere.…”

“…Some of them are open circuit potential (OCP), polarization resistance, and corrosion rate. In addition to the above tests, surface energy test of the coated material, adhesion properties, water absorption measurement, 33 coefficient of thermal expansion (CTE), scratch test, and cathodic disbondment test 34 are very useful in exploring the complete performance of coated material.…”

“…CNTs are known to be one of the best reinforcement materials for many metal-polymer matrices. 77 A twolayer coating structure was developed by TabkhPaz et al 78 on steel substrate and the corrosion properties were investigated. In the first layer, immediately on the top of steel substrate MWCNTs, GNPs and Zn particles were added.…”

Preparation and Anticorrosive Property of Soluble Aniline Tetramer

“…Organic coatings can retard corrosion through a barrier or inhibition mechanism. The barrier mechanism is achieved via a coating that effectively isolates the substrate from corrosive elements [3]. Inhibition refers to a modification of the organic coating that allows transport of the inhibiting species through the aqueous environment onto the metal substrate to retard corrosion via barrier, passivation, or sacrificial mechanisms [4].…”

Tensile and Interfacial Loading Characteristics of Boron Nitride-Carbon Nanosheet Reinforced Polymer Nanocomposites

“…In contrast to CNT/graphene, the heterogeneous surface of BN offers an improved load-sharing ability with the surrounding matrix [23]. The thermal stability of BN also makes it more attractive for use in the manufacturing of nanocomposites for protective applications in high thermal or corrosive environments [24,25]. Buoyed by the contrasting properties of graphene and BNNS, there is a clear need to investigate the mechanical characteristics of nanocomposites reinforced with hybrid BN–C nanostructures.…”