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anodized film

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030169
EISBN: 978-1-62708-282-2
... are of several different types. There are inorganic coatings, including claddings, and enhanced oxides, such as anodized films, Boehmite films, and conversion coatings. Each of these is discussed in more detail in the following paragraphs. Alclad Aluminum Alclad aluminum is a duplex product in which...
Image
Published: 01 January 2000
Fig. 16 Danger of anodic protection when a protective (passive) film is not realized More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850562
EISBN: 978-1-62708-260-0
... film forms. Peel off after I-IV2 min, electropolish for 1 min more (Perryman and Blade). 4-6 Good for Al-Mg alloys (Perryman). 4-6 10-12 20 s Good for Al-Ag alloys. Bath age affects operating conditions (Larke and Wicks). Good for Al-Si and Al-U alloys. Polish for 2 min, rotate anode, repeat until...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940183
EISBN: 978-1-62708-302-7
... crit and i p is of major significance since this change indicates the effectiveness of the passive film in reducing the dissolution (corrosion) rate at the anode surface. To be of practical significance, the ratio i p /i crit should be 10 –2 and preferably smaller; ratios as low as 10 –6...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030165
EISBN: 978-1-62708-282-2
.... For metals that form a passive film, coupling with another metal of higher potential can cause the potential of the film-forming metal to shift from a value where it corrodes to one where a passive film is formed. When this is done intentionally, the procedure is referred to as anodic protection. Corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340211
EISBN: 978-1-62708-427-7
... to greatly enhance wear resistance and corrosion protection of selected parts ( Ref 10.4 ). The natural aluminum oxide film that forms on the surface in air is thin and relatively easy to penetrate, providing a small amount of natural protection. The purpose of anodizing is to grow the anodic film under...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
... and oil exploration, drilling, and production are commonly protected by the use of aluminum anodes on the steel structures. In seawater, the sacrificial aluminum anodes remain active and do not form passive films that would negate their effectiveness as sacrificial anodes. Fig. 11 Zinc “bracelet...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940001
EISBN: 978-1-62708-302-7
... variable in determining the corrosion rate. In addition, if high-resistance interface films form, the total circuit resistance, R S + R M + R interface , increases, and the corrosion rate decreases. The relative sizes and locations of anodic and cathodic areas are important variables affecting...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.9781627083027
EISBN: 978-1-62708-302-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350011
EISBN: 978-1-62708-315-7
... combinations of metals as close together as possible in the galvanic series), insulating dissimilar metals, applying a barrier coating to both the anodic (less noble) and cathodic (noble) metal, applying a sacrificial coating (aluminum, zinc, or cadmium) to the cathodic part, applying nonmetallic films (e.g...
Image
Published: 01 July 2000
Fig. 7.73 Schematic representation of (a) passive film, (b) passive film rupture by stress-induced slip resulting in exposure of bare substrate, (c) crack initiation by anodic dissolution initiating crevice corrosion conditions before repassivation of exposed substrate, and (d) repassivation More
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
... and cathodic metal, applying a sacrificial coating (such as zinc on steel), applying or building nonmetallic films (e.g., anodizing aluminum alloys), and by providing cathodic protection. 18.2.3 Pitting Pitting is a form of highly localized attack characterized by the formation of small pits...
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
..., although zinc is the most active. The oxide films formed on these materials can shift their potentials to more noble values. Thus, in some environments, they may occupy more noble positions than one might otherwise expect. For example, the tin coating in tin cans is anodic to steel under anaerobic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940271
EISBN: 978-1-62708-302-7
... this film alone is responsible, in general, films thicken with increase in time usually to a steady value that is greater the higher the anodic potential. The steady-state thickness is observed to increase linearly with increase in potential, and for most active-passive metals, the maximum thickness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870191
EISBN: 978-1-62708-299-0
... in the plant ( Fig. 3 ). In such instances, the ideals of a total design concept become especially apparent, but usually they appear in hindsight. Direct contact of dissimilar metals introduces the possibility of galvanic corrosion, and small anodic (corroding) areas should be avoided wherever this contact...
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
... or protective barrier that is stable over a considerable range of oxidizing power and is eventually destroyed in strong oxidizing solutions. Under conditions in which the surface film is stable, the anodic reaction is stifled and the metal surface is protected from corrosion. Metals that possess an active...
Image
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
Image
Published: 01 August 1999
Fig. 2 Schematic representations of the postulated theories of stress-corrosion cracking (SCC) for aluminum alloys. (a) Anodic dissolution. (b) Hydrogen-induced cracking. (c) Rupture of the passive film. Source: Ref 3 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230459
EISBN: 978-1-62708-298-3
..., and in dry air, a protective, nonporous oxide (BeO) film forms. It reaches a limited thickness of approximately 100 Å, although thicknesses of approximately 30 Å are often quoted. The oxide occupies a volume 1.68 times that of the metal consumed in forming the oxide. Thus, being in compression, the oxide...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030126
EISBN: 978-1-62708-282-2
... be thermodynamically possible and that a protective film, such as an oxide or salt, must be thermodynamically stable. The first condition becomes a requirement because, without oxidation, crack advance by dissolution would not result. That a process is controlled by anodic dissolution does not a priori indicate...