Download e-book for kindle: Corrosion: Understanding the Basics (06691G) by J. R. Davis

By J. R. Davis

ISBN-10: 0871706415

ISBN-13: 9780871706416

Provides sensible discussions on thermodynamic and electrochemical rules of corrosion, popularity and prevention of assorted sorts of corrosion, kinds of corrosive environments in most cases encountered. DLC: Corrosion and anti-corrosives.

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Additional info for Corrosion: Understanding the Basics (06691G)

Sample text

Active Behavior. Another possible behavior is that the metal corrodes. A metal’s behavior is described as active when it corrodes in the solution. When active behavior is observed, the metal dissolves in solution and forms soluble, nonprotective corrosion products. Corrosion or dissolution of the metal continues in this solution because the corrosion products do not prevent subsequent corrosion. Active corrosion is characterized by high weight loss of the metal. If the metal sample is weighed prior to immersion in the solution and then reweighed after the exposure period, a significant weight loss is measured.

The degree of ionization or the number of sodium chloride molecules that break up into sodium ions and chloride ions depends on the particular compound and its concentration. Fig. 16 Relationship between the tendency of a metal to corrode and the oxidizing power of a solution Basic Concepts Important to Corrosion 43 The degree of ionization of several chemicals is shown in Table 5. 0. 0 for the degree of ionization indicate that the compound forms many ions, and very low values indicate that the compound forms only a few ions.

These compounds also produce a large number of hydrogen ions (hydrochloric acid) and hydroxyl ions (potassium hydroxide) in solution. Boric acid and ammonium hydrogen, on the other hand, are a weak acid and a weak base, respectively, because there are only a few hydrogen ions and hydroxyl ions in their solutions. The chemicals that are acids generate hydrogen ions when they dissociate. The chemicals that are bases produce hydroxyl ions when they dissociate. Salts are chemicals that produce neither hydrogen ions nor hydroxyl ions when they dissociate.

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Corrosion: Understanding the Basics (06691G) by J. R. Davis

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