Nanostructure of Materials and Corrosion Resistance

Abstract

Additional information is available at the end of the chapter http://dx.doi.org/10.5772/57274 . IntroductionThe application of nanotechnology in the field of corrosion protection of metals and alloys attracts the attention of researchers. Many of these applications require good understanding of the corrosion behavior of the materials as a function of microstructure. Significant progress has been made in various aspects of synthesis of nano-scale materials. In addition, nanostructures promote selective oxidation, forming a protective oxide scale with superior adhesion to the substrate. Nanostructured materials ofnm are known for their outstanding mechanical and physical properties due to their extremely fine grain size and high grain boundary volume fraction [ ]. They are important due to their unique properties that may lead to new and exciting applications [ ]. Nanocomposite of polymer 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 [ , ]. Such behavior of nanostrucured materials, which relates to corrosion resistance, relies on materials microstructure. In fact, most properties of solids depend on the materials microstructure. The microstructure includes a number of parameters such as the chemical composition, the arrangement of the atoms the atomic structure and the size of a solid in one, two or three dimensions [ ]. Comparable variations have been noted if the atomic structure of a solid deviates far from equilibrium or if its size is reduced to a few interatomic spacing in one, two or three dimensions. Nanoporous metals NPMs made by dealloying represent a class of functional materials with the unique structural properties of mechanical rigidity, electrical conductivity, and high corrosion resistance [ ]. It is stated by Weissm(ller et. al, that the prospect of using alloy corrosion as a means of making nanomaterials for fundamental studies and functional applications has led to a revived interest in the process. The quite distinct mechanical properties of nanoporous metals are one of the focus points of this interest, as relevant studies probe the deformation behavior of crystals at © 2014 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.the lower end of the size scale. Furthermore, the coupling of bulk stress and strain to the forces acting along the surface of nanoporous metals provide unique opportunities for controlling the mechanical behavior through external variables such as the electrical or chemical potentials [ ]. The relation between chemical architecture of thin and nm chromium and tantalum oxide coatings grown by filter...

Influence of different counterions on gemini surfactants with polyamine platform as corrosion inhibitors for stainless steel AISI 304 in 3 M HCl

“…Important aspect of this research is using stainless steel. Stainless steels are widely used in industry as construction materials, because of their good mechanical properties and corrosion resistance [20][21][22].…”