By Bernard S. Covino Jr.
ASM instruction manual, Vol. 13A: Corrosion: basics, safeguard and Prevention
The goal of ASM guide, quantity 13A: Corrosion: basics, trying out, and safety is to aid engineers and architects comprehend corrosion in an effort to resolve latest corrosion difficulties and forestall destiny ones. it's going to be the 1st booklet you decide whilst learning a corrosion challenge. The assurance of the quantity has been thoroughly revised to make sure that it's the so much finished, useful, and updated source on hand. each one article is listed to different acceptable sections of the instruction manual, and every presents a highway map to the millions of person bibliographical references that have been used to assemble the knowledge.
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Additional info for ASM Handbook: Corrosion : Fundamentals, Testing, and Protection
An example involving the reduction of nitrite ion ( ) to ammonium ion ( ) is given here. In this case, the metal of the electrode supports the reaction by giving or taking away electrons, as follows: The Nernst equation gives: (Eq 13) where the standard potential is expressed as: From the data in Ref 4: The equilibrium potential at 25 °C is then given by: (Eq 14) This E-pH relation is represented for equal activity in Fig. 4 Partial E-pH diagram for the equilibrium Above the line, the ratio and by the line drawn in Fig.
The reaction as written in Eq 22 stands implicitly for the overall chemical reaction in Eq 20; the electrode equilibrium potential is conveniently written as: (Eq 23) where is the standard chemical potential or Gibbs free energy of a conventional electron, equal to . It may be checked that: (Eq 24) The IUPAC convention selects the reduction as the conventional direction for writing electrochemical reactions. This is, of course, not necessarily the spontaneous direction of a reaction, so the corresponding Gibbs free energy change may be positive and the potential negative.
Nuttall, J. Phys. Chem. Ref. Data, Vol 11 (Supplement 2), 1982 E. Protopopoff and P. Marcus, Potential Measurements with Reference Electrodes, Corrosion: Fundamentals, Testing, and Protection, Vol 13A, ASM Handbook, ASM International, 2003, p 13–-16 Potential Measurements with Reference Electrodes E. Protopopoff, Laboratoire de Physico-Chimie des Surfaces, CNRS, and P. Marcus, Ecole Nationale Supérieure de Chimie de Paris, Université Pierre et Marie Curie Introduction ELECTRODE POTENTIAL MEASUREMENT is an important aspect of corrosion studies and corrosion prevention.