By U.K. Chatterjee
This hugely functional reference offers for the 1st time in one quantity all kinds of environmental degradation a steel compound may perhaps endure in the course of its processing, garage, and repair. Clarifying normal and localized corrosion results, Environmental Degradation of Metals describes the consequences of atmospheric publicity, high-temperature gases, soil, water, susceptible and robust chemical compounds, liquid metals, and nuclear radiation. It determines no matter if corrosion can take place below a given set of stipulations, indicates how advancements in part layout can lessen corrosion, and info the excessive- and low-temperature results of oxidizing brokers. The ebook additionally investigates the prompt and behind schedule failure of sturdy steel involved with liquid steel, highlights the impact of hydrogen on steel, and profiles radiation results on steel.
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Extra resources for Environmental Degradation of Metals: Corrosion Technology Series/14
For example, atmospheric corrosion of steels decreases drastically at a relative humidity of below 60%, the increase in salinity above a certain level increases localized attack, and so on. Some definite forms or types of attack are evident irrespective of environments and it is convenient to classify corrosion on the basis of these forms. Broadly, corrosion can be classified as general and localized. The latter takes different forms and can be described as (1) galvanic or two-metal corrosion, (2) pitting, (3) crevice corrosion, (4) intergranular corrosion, (5) dealloying or selective leaching, (6) erosion corrosion, and (7) corrosion cracking.
While these terms serve to describe certain typical characteristics of corrosion pertaining to an environment, corrosion attacks having common features are not unlikely in different environments. Such a classification is useful in assessing the extent and type of attack with the changing conditions of the environment. For example, atmospheric corrosion of steels decreases drastically at a relative humidity of below 60%, the increase in salinity above a certain level increases localized attack, and so on.
Therefore, the increased exchange current density and a flatter cathodic polarization curve on galvanic coupling enhances the corrosion rate because of an intersection at a higher current density value in the active region (Fig. 26). 25 Passivation of titanium by galvanic coupling with platinum air-free acid solution. 26 Effect of galvanic coupling with platinum on corrosion behavior of an iron in air-free acid solution. 3 Theories of Passivity There are two distinct theories of passivity: oxide film theory and adsorption theory.