Effect of nanostructure on corrosion and corrosion resistance of materials

Author(s): A.A.El-Meligi, L.I.Palatino

Significant progress has been made in various aspects of synthesis of nanostructured materials. The nanostructured materials, with their grain sizes or phase dimensions in the nanometer size regime, are produced by a wide variety of synthesis and processing methods. Nanomaterials are characterized by their small grain sizes (1-100 nm) and high volume fraction of grain boundaries, which often gives rise to unique physical, chemical and mechanical properties compared with those of their cast counterparts. These properties have been found particularly useful in corrosion protection applications. The application of nanotechnology in the field of corrosion prevention of metals attracts the attention of researchers. nanostructures promote selective oxidation, forming a protective oxide scale with superior adhesion to the substrate. A polymer nanocomposite coating can effectively combine the benefits of organic polymers, such as elasticity and water resistance to that of advanced inorganic materials, such as hardness and permeability. The nanostructured silica coating showed comparable or better performance than hexavalent chrome passivation. Mild steel is protected by an eco-friendly nanostructured conducting polymer/oil polyurethane composites

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