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electrochemical cells

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310011
EISBN: 978-1-62708-286-0
... of electrochemical theory as it pertains to corrosion resistance of stainless steels. The discussion provides an overview of electrochemical reactions, Faraday's law, the Nernst equation, galvanic versus electrochemical cells, corrosion tendency, and Pourbaix diagrams. corrosion stainless steel corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940023
EISBN: 978-1-62708-302-7
... CN − + e +1103 (a) Selected values from Ref 2 , 7 , and 8 . Summary of electrochemical cell conventions, terminology, and relationships Table 2.2 Summary of electrochemical cell conventions, terminology, and relationships Comment Representation Cell reaction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... of polarization behavior and identification of the various forms of polarization in an electrochemical cell. These concepts, addressed in the remaining of this chapter, include anodic and cathodic reactions, the mixed-potential theory, and the exchange currents. References References Selected References...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030165
EISBN: 978-1-62708-282-2
...Abstract Abstract The basic concept for most methods of corrosion protection is to remove one or more of the electrochemical cell components so that the pure metal or metal alloy of interest will not corrode. Another widely used corrosion protection approach is to change the nature of the anode...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.9781627082501
EISBN: 978-1-62708-250-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940233
EISBN: 978-1-62708-302-7
... (as with the polarization-resistance method) that the surface of the material is not disturbed. In the EIS method, the electrochemical cell is modeled by an equivalent electrical circuit with each element in the circuit corresponding to an electrochemical, chemical, or physical process taking place in the cell...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910427
EISBN: 978-1-62708-250-1
... at the anode and cathode in an electrochemical cell. The current is equivalent to the reaction rate in an operating corrosion cell. The greater the current, the greater the corrosion rate; that is, the polarization of an operating corrosion cell is due to activation polarization, concentration polarization...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940001
EISBN: 978-1-62708-302-7
... of species Z. (a) Figure 1.4 shows a schematic representation of the interrelationships of the processes characterized in this table. Aqueous corrosion is most readily understood in terms of a “dead-shorted” battery or electrochemical cell consisting of two half cells ( Fig. 1.5 ). In comparison...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060369
EISBN: 978-1-62708-261-7
... without stray current effects. Although corrosion is a seemingly pernicious process, it can be disrupted by breaking the oxidation-reduction loop of an electrochemical cell. The difficulty is its complexity. For example, evaluating the corrosion exposure conditions for metallic piping networks...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.9781627083027
EISBN: 978-1-62708-302-7
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310019
EISBN: 978-1-62708-286-0
... law ( R = U / i ), the electrolyte resistance can be computed as: (Eq 18) R e l e c t r o l y t e = L / F 2 A R T ∑ z i 2 C i D i The resistivities of some test solutions are shown in Table 2 . Viewing the electrochemical cell...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940087
EISBN: 978-1-62708-302-7
... . An objective in performing electrochemical measurements on a half-cell reaction is determination of the three kinetic parameters, i o , β ox , and β red . With these parameters determined, the individual polarization curves can be drawn for the oxidation and reduction reactions using Eq 3.47 and 3.48...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240323
EISBN: 978-1-62708-251-8
... charged hydroxyl ions (OH − ) in equal amounts. The metal undergoing electrochemical corrosion need not be immersed in a liquid but may be in contact with moist soil or may just have moist areas on the metal surface. The cathode is the electrode of an electrolytic cell at which reduction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350011
EISBN: 978-1-62708-315-7
... for underground pipe. (a) Sacrificial or galvanic anode. (b) Impressed-current anode. ac, alternating current Fig. 1 Simple electrochemical cell showing the components necessary for corrosion Fig. 3 Schematics of the common forms of corrosion Abstract Abstract This chapter discusses...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310027
EISBN: 978-1-62708-286-0
... different cases. Interestingly, the cathode and anodes, while identifiable, can vary across scales, that is, from distinct macroscopic components or parts to microstructural features. In Chapter 2 , the tendency for corrosion was introduced as a positive value for an electrochemical cell potential ( E...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090257
EISBN: 978-1-62708-266-2
.... Preferential Attack Accelerated dissolution is produced by the electrochemical cell that is created around FeAl, Mg 17 Al 12 , or possibly other precipitates that are cathodic to the magnesium alloy matrix ( Ref 9.20 , 9.22 , 9.24 , 9.26 ). Stress contributes to the process by producing a stress...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
... or more electrochemical half-cell reactions can occur simultaneously at a metal surface, the metal acts as a mixed electrode and exhibits a potential relative to a reference electrode that is a function of the interaction of the several electrochemical reactions. If the metal can be considered inert...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610501
EISBN: 978-1-62708-303-4
... in ambient air. Intergranular cracking and fatigue striations are evident on the fracture surface; the grain appears to have separated from the rest of the microstructure. Source: Ref 17 Fig. 2 Electrolytic corrosion of steel. Source: Ref 2 Fig. 3 Basic electrochemical cell. Source...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310057
EISBN: 978-1-62708-286-0
...-Jeffes (Gibbs free energy-temperature) diagrams such as the one shown in Fig. 1 ( Ref 4 ). The electron holes that form as charge-compensating defects serve as the “electron lead” in the electrochemical cell in Fig. 4b . The free energy of Reaction 4 determines the concentration of mobile defects...