By U.K. Chatterjee
This hugely functional reference provides for the 1st time in one quantity all kinds of environmental degradation a metal compound may well suffer in the course of its processing, garage, and repair. Clarifying common and localized corrosion results, Environmental Degradation of Metals describes the results of atmospheric publicity, high-temperature gases, soil, water, susceptible and powerful chemical substances, liquid metals, and nuclear radiation. It determines no matter if corrosion can happen less than a given set of stipulations, indicates how advancements in part layout can decrease corrosion, and information the excessive- and low-temperature results of oxidizing brokers. The ebook additionally investigates the prompt and not on time failure of good steel in touch with liquid steel, highlights the impression of hydrogen on steel, and profiles radiation results on steel.
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Extra info for Environmental Degradation of Metals: Corrosion Technology Series 14
Referring again to the copper-zinc cell in Fig. 76 V (SHE). 1 V. This has a positive sign and, therefore, ∆G° will yield a negative value (Eq. , the oxidation of zinc metal and reduction of Cu 2ϩ ions are thermodynamically favored. Thus in any electrochemical reaction, the most negative or active half-cell tends to be oxidized and the most positive or noble half-cell tends to be reduced. The larger positive value of redox potential is synonymous with high oxidizing ability of the reaction. It is immediately apparent from the emf series that the metals below hydrogen will corrode (at least, they will have the tendency to corrode) in oxygen-free acid solutions with the evolution of hydrogen.
Other metals that show passivity include silicon, tantalum, niobium, molybdenum, and zirconium. Usual corrosion conditions are not sufficiently oxidizing to induce passivity in iron, but they do passivate aluminium and titanium. 18 (a) Electrochemical behavior of a normal metal corroding with a diffusion-controlled cathodic process showing the effect of velocity. (b) Corrosion rate as a function of velocity. sive by an initial exposure to fuming nitric acid. Its subsequent exposure to a corrosive media, such as dilute sulfuric acid, will bring down the corrosion rate drastically, by an order of 10 4 to 10 6.
Situation marked by D, beyond which the rate assumes a steady value. In contrast, for an active-passive metal, an increase in i L up to i cr increases the corrosion rate and beyond i cr the corrosion rate falls drastically, as the intersection of the cathodic polarization curve with the anodic polarization curve takes place only in the passive region (Fig. 23). 3. Addition of oxidizers. The effect of addition of oxidizing agents such as ferric, cupric, or chromate ions in the electrolyte on the corrosion behavior of active-passive metals has been illustrated in Fig.
Environmental Degradation of Metals: Corrosion Technology Series 14 by U.K. Chatterjee