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barrier-type oxide film

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Published: 01 January 2003
Fig. 1 Structure of barrier type oxide films formed on aluminum after (a) electropolishing, (b) hydrothermal treatment, and (c) thermal treatment More
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003680
EISBN: 978-1-62708-182-5
... Abstract Anodizing is one of the most common surface treatments of aluminum and is performed for corrosion protection. This article describes the structure and growth characteristics of the types of anodic oxide films such as a barrier-type oxide film and a porous-type anodic oxide film...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003672
EISBN: 978-1-62708-182-5
... resistance of stainless steels is due to the protective nature of the surface oxide film that forms a barrier between the environment and the alloy. The physical and chemical properties of the oxide film and the service environment determine the corrosion resistance of the alloy. In addition to alloying...
Image
Published: 01 January 2005
to passivate and produce a corrosion-resistant oxide barrier film. The tines of the forks were ground and polished and generally reflective; a lacquer coating was disturbed by filaments of filiform attack. The plastic enclosure, which was moist and contained chlorides, experienced condensation and evaporation More
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006051
EISBN: 978-1-62708-172-6
... shape and coating film properties of pigments Table 1 Particle shape and coating film properties of pigments Particle shape Benefit Usage Pigment type Platey Barrier properties Corrosion resistance Bleed and stain killing Enamel holdout TiO 2 extension (spacers) in high-PVC flats...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003809
EISBN: 978-1-62708-183-2
... the effectiveness of the barrier film. Some aluminum and stainless steel pigments protect in this fashion. With passivation of the steel, the reactivity of the steel surface can be decreased when the paint film contains anticorrosive pigments such as phosphate salts, chromate salts, and lead oxide. Paints...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003600
EISBN: 978-1-62708-182-5
..., the corrosion of copper during CMP can be expressed as an anodic reaction, where copper metal is oxidized: (Eq 1) Cu → Cu + + e − (Eq 2) Cu + → Cu 2 + + e − For film formation, the oxidation of copper to Cu 2 O in aqueous solutions with dissolved oxygen...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003589
EISBN: 978-1-62708-182-5
... cations from the metal and through the film. The rate-controlling step is the transfer of cations (or anions) into the oxide or the movement of the ions through the oxide. The electric field reduces this barrier. The structure of the oxide determines whether cations or anions migrate through the oxide...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001285
EISBN: 978-1-62708-170-2
... dyn/cm 2 , tensile. Excessive stress can cause the films to crack and peel ( Ref 29 ). It is possible to choose the stress type and control the stress level by selecting the right deposition conditions ( Ref 21 ). Silicon Oxide Films Silicon oxide films are used as intermetallic dielectric...
Book Chapter

By Jude Mary Runge
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006523
EISBN: 978-1-62708-207-5
... types of oxides, namely, barrier-layer anodic oxides and porous anodic oxides. It concludes with a description of postanodizing processes, such as dyeing and sealing. aluminum alloys anodizing nucleation electrochemical parameters ANODIZING is an electrochemical process by which a uniform...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003674
EISBN: 978-1-62708-182-5
... significantly influence the properties of aluminum alloys. There are organic coatings or paints that provide a barrier between a corrosive environment and aluminum surface. Inorganic coatings, including claddings, and enhanced oxides, such as anodized films, Boehmite films, and conversion coatings also help...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003220
EISBN: 978-1-62708-199-3
... Ceramic Coatings Ceramic coatings are frequently applied to heat-resistant alloys to increase the oxidation resistance of parts exposed to extremely high temperatures, such as gas turbine and missile components. Several types of ceramics are currently used; some serve as thermal barriers as well...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003834
EISBN: 978-1-62708-183-2
... of the process and required equipment. Some of the properties that affect the bonding process include ductility, nature and stability of oxide films (for example, the ratio of hardness between the film and the metal itself), and the tendency to form intermetallic compounds. Because bonding processes commonly use...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006530
EISBN: 978-1-62708-207-5
... hundred nanometers. It contains rolled-in oxide particles from the high forces used during hot and cold rolling; it has elongated and smaller grains than the bulk, and it can contain various intermetallic particles different in chemistry and concentration than the bulk. The natural aluminum oxide film...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004126
EISBN: 978-1-62708-184-9
... finishes on aluminum convert the aluminum metal to a thicker aluminum oxide film (relative to the “natural” or air-formed film). As shown in Fig. 2 , aluminum oxide is a cathode with respect to aluminum, so pitting corrosion occurs at defects in the coating. Not sealing the hardcoat improves the wear...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005653
EISBN: 978-1-62708-198-6
... is in such significant use today is due to their corrosion resistance within the environment of the human body. The main factor governing the corrosion resistance of medical alloys is the presence of a nanometer-scale oxide film that spontaneously forms on the surface. These oxide films provide a kinetic barrier...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004206
EISBN: 978-1-62708-184-9
... provide a kinetic barrier to corrosion. That is, each of these alloys has a high free energy driving oxidation of the metal components and each would corrode at extremely high rates if the oxide film were not present to limit specific steps in the corrosion reaction ( Ref 15 , 16 ). However, the oxide...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004204
EISBN: 978-1-62708-184-9
... steel is required to resist an aggressive environment. The highly protective chromium oxide film that gives stainless steel its corrosion resistance is tenacious, durable, and self-healing in the presence of oxygen; however, this film can be damaged during fabrication and by cleanup practices after...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003217
EISBN: 978-1-62708-199-3
... that of outdoor exposure to 1150 °C (2100 °F). Aluminum coatings protect steel from attack by forming a very resistant barrier between the corrosive atmosphere and the steel. The aluminum oxide that forms on the aluminum surface is highly resistant to a wide range of environments. The process of applying...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005737
EISBN: 978-1-62708-171-9
... plasma, low-pressure plasma, shrouded plasma, and high-velocity oxyfuel). The objective of a coating is to protect the base material from oxidation, hot corrosion, erosion, and wear. In addition, the application of heat-resistant and heat-insulating ceramics, called thermal barrier coatings (TBCs...