1-20 of 172 Search Results for

cathodic reactions

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
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...
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 coatings...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940023
EISBN: 978-1-62708-302-7
...,X x+ Cell potential E cell = E ′ RHE – E ′ LHE 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...
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...
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 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...
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...
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 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 July 2000
DOI: 10.31399/asm.tb.fec.t65940001
EISBN: 978-1-62708-302-7
... 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 each interface, differences in electrical potential, Δ ϕ a and Δ ϕ c , develop between...
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
... to to 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 December 2008
DOI: 10.31399/asm.tb.ssde.t52310011
EISBN: 978-1-62708-286-0
... 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 and cathode...
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 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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730129
EISBN: 978-1-62708-283-9
... corrosion always involves an electrolytic cell with a cathode and an anode ( Fig. 12.1 ). It is the opposite of electroplating. The anode is where ions go into solution M → M +n + ne − . The cathode is where electrons are consumed. Possible cathode reactions are: M +n + ne − → M (This can occur...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940233
EISBN: 978-1-62708-302-7
.... Fig. 6.1 The potentiostatic circuit The potentiostat can be set to polarize the WE either anodically, in which case the net reaction at the WE surface is oxidation (electrons removed from the WE), or cathodically, in which case the net reaction at the WE surface is reduction (electrons...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230459
EISBN: 978-1-62708-298-3
... of salts from the environment is deposited and becomes concentrated on the surface. Oxygen can readily diffuse through the electrolyte to the surface and contribute to the cathodic reaction, thus accelerating the corrosion that may be induced by these salts, for example, chloride salts. The term...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610501
EISBN: 978-1-62708-303-4
... 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 is the principal reaction. Electrons flow toward the cathode...
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
... moisture layer on the metal surface. The sulfuric acid dissociates to give H + ions ( H 2 SO 4 ↔ 2 H + + SO 4 2 − ) , which participate as the oxidizing agent in the cathodic corrosion reaction ( Eq 1 , 4 and Fig. 2 ). Due to the presence of H...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940183
EISBN: 978-1-62708-302-7
...% Cr-82% Fe alloy in sulfuric acid at pH = 1. Representative cathodic curves for the hydrogen reaction (H) at this pH and for direct reduction of water (W) also are shown. The sum cathodic curve (SC) at each potential would represent the current density resulting from the two cathodic reactants...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030039
EISBN: 978-1-62708-282-2
... concentration and higher rates of dissolution of the alloy. Therefore, the solution within pits and crevices tends to be acidic and highly concentrated. In contrast, the lap-joint environment becomes neither concentrated nor acidic. This difference is due to the lack of an external cathodic reaction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910001
EISBN: 978-1-62708-250-1
... Abstract Corrosion can be defined as a chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties. This chapter describes the effects and economic impact of corrosion in major industrial plants...