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sacrificial cathodic protection systems

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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
... in which the oxidation reaction in a galvanic cell is concentrated at the anode, which suppresses corrosion of the cathode in the same cell. Figure 1 shows a simple cathodic protection system. The steel pipeline is cathodically protected by its connection to a sacrificial magnesium anode buried...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870075
EISBN: 978-1-62708-299-0
... of Galvanic Corrosion Contact of aluminum with more cathodic metals should be avoided in any environment in which aluminum by itself is subject to pitting corrosion. Where such contact is necessary, protective measures should be implemented to minimize sacrificial corrosion of the aluminum...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030165
EISBN: 978-1-62708-282-2
... that it becomes the cathode (cathodic protection). This chapter briefly reviews these methods of corrosion protection. The factors affecting corrosion behavior are covered. In addition, the chapter provides information on coatings and inhibitors, which are used in corrosion protection. corrosion protection...
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
.... Galvanic corrosion of the substrate can occur at pores, damage sites, and edges in the noble metal coating. Sacrificial metal coatings provide cathodic protection of the more noble base metal, as in the case of galvanized steel or Alclad aluminum. Cathodic Protection Magnesium, zinc, and aluminum...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030023
EISBN: 978-1-62708-282-2
... that is cathodically protected, if a foreign pipeline crosses or passes close to the protected pipeline, current from the cathodic protection system can gather onto the foreign pipeline and then be discharged from the foreign line when it crosses or comes close to the protected pipeline. This is particularly true...
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 January 2000
DOI: 10.31399/asm.tb.cub.t66910363
EISBN: 978-1-62708-250-1
... is achieved by the addition of inhibitive pigments to paints. Sacrificial protection is achieved by coating the substrate with a more active metal. This results in the substrate becoming the cathode in the corrosion cell. Galvanized steel, which is comprised of a thin layer of metallic zinc over a steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350011
EISBN: 978-1-62708-315-7
... sheet is an example of useful application of galvanic action or cathodic protection. Iron is the cathode and is protected against corrosion at the expense of the sacrificial zinc anode. Alternatively, a zinc or magnesium anode may be located in the electrolyte close to the structure and may be connected...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030247
EISBN: 978-1-62708-282-2
... as encountered in applications involving oil and gas exploration and production. This is followed by a section reviewing the methods of corrosion control, namely the proper selection of materials, protective coatings, cathodic protection systems, use of inhibitors, use of nonmetallic materials, and control...
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 January 2000
DOI: 10.31399/asm.tb.cub.t66910497
EISBN: 978-1-62708-250-1
... around anodes, vent pipe, and buried components of a cathodic protection system. bimetallic corrosion. See galvanic corrosion. biological corrosion. Deterioration of metals as a result of the meta- bolic activity of microorganisms. blistering. Formation of dome-shaped projections in paints or varnish...
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 January 2000
DOI: 10.31399/asm.tb.cub.t66910001
EISBN: 978-1-62708-250-1
... current. An impressed-current system uses a power source to force current from inert anodes to the structure to be protected. A sacrificial-anode system uses active metal anodes, for example, zinc or magnesium, which are connected to the structure to provide the cathodic-protection current. Design...
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
... that isolate the metal from the environment, or by cathodic protection. In cathodic protection, the metal to be protected is electrically connected to a more anodic metal, so that the sacrificial anodic metal corrodes instead of the metal being protected. For example, steel is often coated with zinc...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610501
EISBN: 978-1-62708-303-4
... for various reasons. Coatings of aluminum and aluminum-zinc alloys on steel, however, are widely used for resistance to both high temperatures and corrosion, as are required in automotive exhaust systems, for example. The same cathodic protection principle is used with magnesium anodes buried in the ground...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
... resistance of the system, R total . R total includes the resistance in the metal between anodic and cathodic areas, R M ; a metal junction resistance if different metals are associated with the two areas, R ac ; any anode- or cathode-solution interface resistance, R ai and R ci ; and the solution...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910099
EISBN: 978-1-62708-250-1
..., the use of biodispersants and biocides in biofouled systems, and the judicious use of inhibitors Cathodic protection Protective coatings such as water-impermeable phenolic resins, epoxies, and other organic compounds, sacrificial coatings (e.g., zinc thermal spray coatings), and electroplated...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630211
EISBN: 978-1-62708-270-9
... for various reasons. Coatings of aluminum and aluminum-zinc alloys on steel, however, are widely used for resistance to both high temperatures and aqueous corrosion, as are required in automotive exhaust systems, for example. The same cathodic protection principle is used with magnesium anodes buried...
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 corrosion and the factors that control the rates of corrosion reactions requires examination of the concepts 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...