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anodic oxidation

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Published: 30 June 2023
Fig. 10.16 Anodizing. (a) Growth of aluminum oxide surface layer due to anodizing process. (b) SEM photomicrograph of anodized surface layer on 6061-T6 aluminum sheet. Source: Alcoa More
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Published: 01 January 2000
Fig. 13 Use of mixed oxide/titanium anode mesh for cathodic protection. (a) Sidewalk and barrier wall installation. (b) Installation of anode mesh on a bridge substructure. More
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Published: 01 December 2015
Fig. 18 Use of mixed oxide/titanium anode mesh for cathodic protection. (a) Sidewalk and barrier-wall installation. (b) Installation of anode mesh on a bridge substructure. Courtesy of ELTECH Systems Corporation More
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Published: 01 July 2000
Fig. 3.3 Anodic polarization curve representative of active/passive alloys. Oxide films forming in the potential range a to c cause a decrease in current density. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... is the anode, and the reaction proceeds in the oxidation direction, or the direction that produces electrons. Using values of the standard electrode potentials and the Nernst equation ( Eq 1 ) to determine the effect of ionic concentration on electrode potentials, the electrode potentials for the reactions...
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.t66910497
EISBN: 978-1-62708-250-1
... in both acid and alkaline environments. anaerobic. Free of air or uncombined oxygen. anion. A negatively charged ion that migrates through the electrolyte toward the anode under the influence of a potential gradient. See also cation and ion. anode. The electrode of an electrolyte cell at which oxidation...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480331
EISBN: 978-1-62708-318-8
...., gaskets) Oxidizing species depleted, metal in crevice becomes anode, HCl formed in crevice Stress-corrosion cracking Cracking under stress, abbreviated as stress-corrosion cracking (SCC) Only in extreme cases (absolute methanol, red fuming nitric) for commercially pure titanium. Ti-6Al-4V can...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940183
EISBN: 978-1-62708-302-7
... is lowered. It should be noted that there is no evidence of a peak or local maximum in the anodic curve related to a transition from the active to passive state. This is a result of the preexisting air-formed oxide film that effectively prepassivates the aluminum. Only under very restricted conditions...
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
...(OH) 3 + 3H 2 O. Ferric hydroxide is insoluble and precipitates as rust. If dried, the ferric hydroxide turns into an oxide, 2Fe(OH) 3 → Fe 2 O 3 + 3H 2 O. Often, the rust-producing reaction occurs at some distance from where the anode reaction occurs, so rust deposits may not be directly over...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870075
EISBN: 978-1-62708-299-0
... a metallic deposit. This ion is rarely encountered in service because it reacts preferentially with oxygen and water to form insoluble oxides and hydroxides, except in acidic solutions outside the passive range of aluminum. On the other hand, at room temperature, the most anodic aluminum alloys (those...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940001
EISBN: 978-1-62708-302-7
... is sustained by the consumption of the electrons by another reaction, generalized in this case as X x+ + xe → X. The oxidation occurs at a site on the metal surface referred to as the anodic reaction site and is the location of the loss of metal by corrosion. The electrons are picked up at a cathodic reaction...
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
.... 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 is, by definition...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
... of position in the solution, and the value will be a function of the electrode reaction kinetics. If the oxidation (anodic) and reduction (cathodic) sites are separated by dimensions large relative to a reference electrode, the mixed potential measured by the reference electrode will depend upon position...
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
..., a complete electrical circuit is required. In a corroding system ( Fig. 18.1 ), 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 away from the anode in the external circuit. It is the electrode...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
... as anodes. Instead of corrosion of the anodes, some other oxidation reaction, that is, oxygen or chlorine evaluation, occurs at the anodes, and the anodes are not consumed. The most common source of electricity for impressed-current systems is a local power utility. Power normally involves the dc...
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...
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...
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
.... The electrode of an electrolyte cell at which oxidation occurs. Electrons ow away from the anode in the external circuit. It is usually at this electrode that corrosion occurs and metal ions enter solution. Contrast with cathode. anode corrosion. The dissolution of a metal acting as an anode. anode corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2