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impressed-current cathodic protection systems

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Published: 01 January 2000
Fig. 2 Schematic of an impressed-current cathodic protection system More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
... systems. The types of cathodic protection systems include sacrificial cathodic protection and impressed-current cathodic protection systems. Some of the technical problems associated with cathodic protection include the effects of stray currents on the corrosion of adjacent metal structures, the effects...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030184
EISBN: 978-1-62708-282-2
... of cathodic protection: sacrificial-anode (passive) systems and impressed-current (active) systems. Sacrificial-anode systems are simpler. They require only a material anodic to the protected steel in the environment of interest ( Fig. 1 ). Figure 5 shows an impressed-current system used to protect...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870075
EISBN: 978-1-62708-299-0
... be caused by close proximity to other buried metal systems that are being protected by an impressed current cathodic protection system. These stray currents can leak onto a buried aluminum structure at one point, then off at another (where corrosion occurs), taking a low-resistance path between the driven...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030180
EISBN: 978-1-62708-282-2
... reaction does not occur. Other descriptions of cathodic protection state that the currents result in the metal to be protected becoming a cathode over the entire metal surface and shifting the anodic reaction to an external electrode. In principle, any corrosion system can be cathodically protected as long...
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
.... In the past, electric railways were a major source of stray dc. Other important sources of stray current include cathodic protection systems, electrical welding machines, and other grounded dc electric sources. Stray currents are frequently encountered problems in cathodic-protection systems. Figure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030165
EISBN: 978-1-62708-282-2
... cathodic protection (SACP). The lowering of potential can also be accomplished by applying a direct electrical current from an external source. This is impressed-current cathodic protection (ICCP). An undesired consequence of excessive cathodic protection (CP) or the use of cathodic protection...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350011
EISBN: 978-1-62708-315-7
.... This cell includes the following essential components: (a) a metal anode, (b) a metal cathode, (c) a metallic conductor between the anode and the cathode, and (d) an electrolyte in contact with the anode and the cathode. If the cell were constructed and allowed to function, an electrical current would flow...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030338
EISBN: 978-1-62708-282-2
.... 11 and 12 . Fig. 11 Sacrificial anode CP system with distributed magnesium anodes and an above-ground test station Fig. 12 Impressed current CP system with above-ground rectifier and a single remote anode groundbed Cathodic protection is most often used in conjunction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030247
EISBN: 978-1-62708-282-2
... corrode 9 kg (20 lb) of steel. Cathodic protection systems are the most likely present-day sources of stray dc currents in production operations. More detailed discussions are available in Ref 12 and 32 . The article “ Stray-Current Corrosion ” contains information on the causes and mechanisms...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910497
EISBN: 978-1-62708-250-1
... protection of a metal from corrosion by making it a cathode, using ei- ther a galvanic or an impressed current. Contrast with anodic protec- tion. cathodic reaction. Electrode reaction equivalent to a transfer of nega- tive charge from the electronic to the ionic conductor. A cathodic re- action...
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 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
... corroding systems are obviously more complicated than represented by this model. Useful quantitative calculation of the distribution of current density, and hence corrosion rate along the surface, based on the polarization curves for the anodic and cathodic reactions and on the geometry of the anodic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030019
EISBN: 978-1-62708-282-2
... resistant metal decreases, and the surface becomes cathodic. The driving force for corrosion or galvanic current flow is the potential developed between the dissimilar metals. The extent of corrosion resulting from galvanic coupling is affected by the following factors: The potential difference...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... reactions, the mixed-potential theory, and the exchange currents. aqueous corrosion free energy electrochemical potential potential-pH diagram iron gold copper zinc aluminum titanium polarization anodic reactions cathodic reactions mixed-potential theory exchange currents ionic...
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
... in a process called galvanizing. The zinc coating, being more anodic than steel, corrodes preferentially to the underlying steel. This is the passive type of cathodic protection. The active (impressed-current) type is discussed in section 18.3.3, “Electrochemical Control,” in this chapter. 18.2.2 Galvanic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030380
EISBN: 978-1-62708-282-2
... to pass current to or from a test electrode. It is usually made from a noncorroding material; often called the counterelectrode. B back ll. Material placed in a drilled hole to ll space around anodes, vent pipe, and buried components of a cathodic protection system. bainite. A metastable aggregate...
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 January 2000
DOI: 10.31399/asm.tb.cub.t66910427
EISBN: 978-1-62708-250-1
.... The electrochemical potential is equivalent to the driving force for reactions, and it determines the reactions that can occur at the anode and cathode in an electrochemical cell. The current is equivalent to the reaction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610501
EISBN: 978-1-62708-303-4
... surface to another part of the same surface. For a current to flow, a complete electrical circuit is required. In a corroding system ( Fig. 1 ), this circuit is made up of four components: The anode is the electrode of an electrolytic cell at which oxidation is the principal reaction. Electrons flow...