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anodic oxidation

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Published: 01 January 2002
Fig. 2 Schematic diagram of a generic corrosion cell showing anodic oxidation of the metal ( M ) complemented by cathodic reduction of an electron acceptor ( X ). The corrosion rate can be controlled by the rate of arrival of X at the cathodic surface, a buildup of metal ions, M 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 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...
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
... the nucleation and growth of anodic aluminum oxide and the important characteristics of the finished porous anodic aluminum oxide. In industry, anodic oxides and the anodizing processes have been categorized into types that exhibit specific properties to suit specific applications. The article reviews the two...
Book Chapter

By Jerome Kruger
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003585
EISBN: 978-1-62708-182-5
..., composition, structure, electronic properties, and mechanical properties. The article outlines three possible processes that can form passive films: direct film formation, dissolution precipitation, and anodic oxidation of metal ions in solution. It describes the breakdown of the passive film using various...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006522
EISBN: 978-1-62708-207-5
... connected to the surface microstructure and thus to the reactions that occur during surface finishing. Because the oxide growth interface advances into the bulk during anodizing, the expanse of the reactive surface between the aluminum and the environment continuously changes. Therefore, both the surface...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006491
EISBN: 978-1-62708-207-5
..., silver, cadmium, gold, lead, and rhodium elements as well as certain alloys are commercially deposited from aqueous solutions. Conductive oxides also can be deposited by electroplating. Typically, the anode of the electrolytic cell is of the material being deposited and is consumed in the deposition...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001312
EISBN: 978-1-62708-170-2
... temperature rise during the transfer to the rinse water can lead to redeposition of the etching product. Anodizing and Autoclaving Zirconium and hafnium oxidize readily in air and aqueous solution, but the tenacious oxide layer generally protects the metal from further oxidation. Methods to produce...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003677
EISBN: 978-1-62708-182-5
... titanium alloys. The article also illustrates the effects of alloying on active anodic corrosion of titanium and repassivation behavior of titanium and titanium-base alloys. titanium oxide film titanium oxide depassivation scratching abrading fretting titanium alloys hexagonal close-packed...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003595
EISBN: 978-1-62708-182-5
... Formation of anodic film during electropolishing Anodic Processes Anodic dissolution processes are complex. Depending on the nature of the dissolving metal (M), the electrolyte composition, and the current density, the following anodic (oxidation) reactions may occur: Transfer of metal ions...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003601
EISBN: 978-1-62708-182-5
... of the two competing processes occurs. Constructive versus Destructive Corrosion in Batteries There are three roles that corrosion, or oxidation of a metal, may play at anodes in batteries. Two of these are constructive and hence desirable. The third is destructive and therefore undesirable. Two...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006499
EISBN: 978-1-62708-207-5
... fastness, heat resistance, and thermal or electrical responses. The general principle behind most types of sealing is to fill the open-pore structure of the anodic coating by converting the amorphous aluminum oxide as formed to a crystalline form of aluminum oxide ( Ref 1 ). This hydrated aluminum...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003583
EISBN: 978-1-62708-182-5
... to the equilibrium between a metal and one of its oxides/hydroxides. The article schematically illustrates a current-potential or polarization curve for an anodic process. kinetics aqueous corrosion equilibrium potentials electrochemical reaction Nernst equation electronic conductivity passive films...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001281
EISBN: 978-1-62708-170-2
...Abstract Abstract Anodizing refers to conversion coating of the surface of aluminum and its alloys to porous aluminum oxide. This article provides the reasons for performing anodizing and discusses the three principal types of anodizing processes, namely, chromic acid process, sulfuric acid...