Gaseous corrosion definition

There are many types of corrosion, as would be expected from its general definition. It has been traditional (4) to divide the study of corrosion into two areas the study of low temperature corrosion by aqueous or other solutions, controlled by electrochemical processes (wet) and the study of gaseous corrosion at high temperatures, controlled by thermodynamics and diffusion processes (dry). In addition to the obvious differences, the two areas have many phenomena in common. 

Modem three layers pressure vessels are under study, which consist of a stressbearing component - an inner polymer liner over-wrapped with a carbon-fibre composite - and an outer aramid-material layer, mechanical and corrosion damage resistant [1]. A system for the gaseous hydrogen storage at room temperature has also been designed, adopting a definite number of linked cylindrical pressure vessels [13]. 

Surface analysis is a complex matter. The complexity starts by the definition of the term surface itself. Not everyone understands the same by surface. We often hear and speak about the surface of Earth or Mars, about the inner surfaces of a zeolite, about the existence of surface processes such as corrosion or adhesion, and so on. Depending on the field or the particular application, we talk about different things that have, however, a common characteristic. In all the cases, the surface is a border region that separates the solid (the bulk) from the environment (liquid or gaseous). It is the thickness of this border region, and what happens within this thickness, that determines the characteristics of many processes that are relevant in both basic science and technology. This thickness may extend from a few atomic layers (and thus be the subject of surface science ) to a few nanometers (surface analysis) or afraction of a micrometer (thin film analysis). Thus, in this chapter the term surface represents the external part of a solid having a thickness from a fraction of a monolayer to a few nanometers. 

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