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anodic oxide film

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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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030165
EISBN: 978-1-62708-282-2
... further corrosion. Anodization of aluminum, one of the more commonly used conversion coating techniques, produces a protective aluminum oxide film on the aluminum metal. Another example of a chemical conversion coating is phosphatizing for the protection of automobile bodies. Metallic coatings create...
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...
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...
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 liquids can cause attack. It is encountered when particles in a liquid or gas impinge on a metal surface, causing the removal of protective surface films, such as protective oxide films or adherent corrosion products, thus exposing new reactive surfaces that are anodic to noneroded neighboring areas...
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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120123
EISBN: 978-1-62708-269-3
... oxidizing conditions (such as nitric acid, air at moderately high temperatures, and anodic treatments) promote corrosion resistance of titanium and its alloys through growth of the oxide film. Dissolved oxygen is an important inhibitor in hot or mildly reducing chlorine solutions, but if its supply...
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 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
... on the diagram with increasing potential. In this latter case, the increase of potential for oxidizing values will accelerate the corrosion as indicated by the X marked “bad.” Fig. 16 Danger of anodic protection when a protective (passive) film is not realized Equipment Required for Anodic Protection...
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
... Abstract This chapter discusses the corrosion behavior of titanium, the types of corrosion that can occur, and the effect of alloying on corrosion resistance. It explains that, due to its tenacious oxide film, titanium has excellent corrosion resistance in oxidizing environments...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910021
EISBN: 978-1-62708-250-1
... notably stainless steels). Passivation is generally associated with oxidizing media. (Discussion on the oxidizing power of a solution follows.) It is important to realize that a passive film is unlike a coat of paint—though for many practical purposes it can appear to behave as such. This point...
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...
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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...
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
... frequently leads to failure. Localized corrosion can be related to the microstructure of a metal or alloy, the physical condition of the surface, or coupling of the metal to a dissimilar metal or to conducting surface films, usually oxides. These conditions are listed in an order generally observed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870191
EISBN: 978-1-62708-299-0
... examination. (c) Applicable for thicknesses of 0.500 in. and greater Anodizing Aluminum anodizing is an electrochemical method of converting aluminum into aluminum oxide (Al 2 O 3 ) at the surface of the item being coated. It is accomplished by making the workpiece the anode while suspended...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910497
EISBN: 978-1-62708-250-1
...- num or aluminum alloy coating that is anodic to the core and thus electrochemically protects the core against corrosion. 498 Corrosion: Understanding the Basics alligatoring. (1) Surface cracking of an organic film leaving an appear- ance similar to that of an alligator hide. (2) A special form...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.9781627082501
EISBN: 978-1-62708-250-1
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850165
EISBN: 978-1-62708-260-0
... in a similar manner. Analysis of the surface films produced by these reagents reveals the presence of oxide, sulfide, and sulfate compounds [ 17 , 18 ]. Addition of hydrochloric acid to these solutions permits their use on stainless steels and heat-resisting alloys containing substantial chromium. The anodic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870235
EISBN: 978-1-62708-314-0
..., but the improvement occurs only if the primer has low enough viscosity to penetrate the oxide. Chemically, the PAA film is amorphous Al 2 O 3 , with a layer of phosphate incorporated onto the surface. Fig. 8.6 Surface morphology of phosphoric acid anodize (PAA). Source: Ref 4 Although the CAA process...