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anodic reactions

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
... Abstract This chapter develops a corrosion model that accounts for solution potentials and the effects of coupling between cathodic and anodic reactions. It begins by examining potential differences at various points (in the solution) along a path from the anode to the cathode area. It then...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
... of the chemical reactions occurring at the surface of the protected structure, and the effects of cathodic protection on coatings. corrosion control cathodic protection anodic protection sacrificial cathodic protection systems impressed-current cathodic protection systems stray currents...
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
... reactions occur at cathodes. Oxidation reactions occur at the anode, and thus, it is not so readily apparent that an anode can be protected from corrosion, because oxidation reactions involving metals usually lead to dissolution of the metal. Anodic protection can be used to control the corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940087
EISBN: 978-1-62708-302-7
... cases, produce changes in electrode potential. corrosion current density electrode kinetics half-cell reaction polarization Electrochemical cells associated with corrosion obviously are not at equilibrium. Net anodic and cathodic currents flow to and from the surface over areas that can...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940023
EISBN: 978-1-62708-302-7
... If reaction is spontaneous from left-to-right, ΔG react < 0, which results in:  Electrode designation Anode Cathode  Terminal polarity Negative Positive  Electrode reaction Oxidation (corrosion) Reduction  Current flow in external circuit ← I  Electron flow in external...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... 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...
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
... understand rates of corrosion. The discussion covers two kinetic processes, namely electrode reactions at the cathode and anode and conduction of ions in the electrolyte. The chapter also provides information on passivation and its effect on polarization diagrams. corrosion kinetics passivation...
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
..., fretting corrosion, intergranular corrosion, exfoliation, dealloying corrosion, stress-corrosion cracking, and corrosion fatigue. The chapter discusses the processes involved in corrosion control by retarding either the anodic or cathodic reactions. The rate of corrosion is reduced by conditioning of the...
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
... reaction. Electrochemical processes require both oxidation and reduction reactions in order to maintain the conservation of electric charge. This process occurs in an electrochemical cell , which consists of an anode and a cathode immersed in an electrolyte (or general chemical surroundings). An anode...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030165
EISBN: 978-1-62708-282-2
... protection cathodic protection corrosion behavior galvanic couples coatings corrosion inhibitors CORROSION is an oxidation reaction where the corroding metal is the anode in an electrochemical cell. In addition to the anode, there are three other components that are necessary for corrosion to occur...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940183
EISBN: 978-1-62708-302-7
... will be even more complex mixtures of ions at any pH. These species may alter the anodic dissolution processes through effects on the kinetics of the interface reactions and by altering the physical and chemical structure of solid corrosion products. Examples of several environmental effects on anodic...
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
... control 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 January 2000
DOI: 10.31399/asm.tb.cub.t66910363
EISBN: 978-1-62708-250-1
..., and laser processing. The last section focuses on nonmetallic inorganic coatings including ceramic coating materials, conversion coatings, and anodized coatings. corrosion control protective coatings corrosion inhibitors organic coatings metallic coatings nonmetallic inorganic coatings...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350095
EISBN: 978-1-62708-315-7
... anodized aluminum 1100 as a function of coating thickness. Source: Ref 4 Weathering of anodic coatings involves relatively uniform erosion of the coating by windborne solid particles, rainfall, and some chemical reaction with pollutants. The available information indicates that such erosion occurs...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240509
EISBN: 978-1-62708-251-8
... Abstract Magnesium occupies the highest anodic position on the galvanic series and can be subject to severe corrosion. The corrosion problem is due to the impurity elements iron, nickel, and copper. However, the use of higher-purity magnesium alloys has led to corrosion resistance approaching...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940001
EISBN: 978-1-62708-302-7
... the cathodic site (for example, an area of adherent-conducting oxide) is the external circuit. At the anodic site, the net oxidation reaction is M → M m+ + me, and at the cathodic site, the generalized net reduction reaction is X x+ + xe → X. As a consequence of the transfer of ions and electrons at...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090001
EISBN: 978-1-62708-266-2
... categories: anodic mechanisms and cathodic mechanisms. That is, during corrosion, both anodic and cathodic reactions must occur, and the phenomena that result in crack propagation may be associated with either type. The most obvious anodic mechanism is that of simple active dissolution and removal of...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030005
EISBN: 978-1-62708-282-2
... Abstract This chapter discusses some important factors involved in the atmospheric corrosion of engineering materials. The discussion begins with a description of elements necessary for the operation of a galvanic corrosion cell and corrosion reactions, followed by the types of atmospheric...
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
... constituting a so-called ionic current. This current together with Reactions 2 and 3 and the transport of electrons from left to right form a closed circuit called an electrochemical cell . The cell is made up of four parts: the two electrodes where the charge transfer Reactions 2 and 3 take place (the anode...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230459
EISBN: 978-1-62708-298-3
... down the corrosion rate at the anode. The reverse difference in relative size between anode and cathode will accelerate the corrosion. If the electrochemical reaction involves several steps and is controlled by a slow step, for example, adsorption on the cathode surface, this will cause polarization...