Corrosion properties of organic polymer coating reinforced two-dimensional nitride nanostructures: a comprehensive review

Abstract

Due to the harmful effects of corrosion in various industries, researchers aim to create more effective coatings with recent nanotechnology advances to prevent the corrosion of materials. For this purpose, one of the most efficient ways is to use new classes of nanocomposite coatings, obtained by the addition of inorganic nanofillers to the polymer matrix, which superior performance over conventional composite coatings. As a filler, Two-dimensional materials can dramatically change the reduction with economic loss due to their outstanding chemical, mechanical, and thermal properties. To date, the essential nanomaterials used as reinforcements in polymer matrices are graphene and clay. Graphene has a cathodic behavior towards all metals and leads to galvanic corrosion over time. Clay contains ions that increase the ionic content and, consequently, the ionic conductivity of the polymer composites. Ionic and electron conductivity result in the deterioration of the corrosion properties. Today, inorganic nanomaterials such as nitride nanoparticles such as h-BN, h-BCN, and g-C 3 N 4 have significant potential to increase the barrier performance of polymer coatings. These additives have a high-energy barrier against the penetration of corrosive ions, which leads to excellent corrosion protection properties. On the other hand, the BN nanoparticles prevent the galvanic corrosion of metal substrates due to their insulating properties. In this review, the effects of adding the aforementioned nitride nanomaterials to polymer coatings are discussed in terms of the resultant corrosion protection performance, and a comprehensive study on the corrosion resistance of these coatings is conducted.