Electrochemical tunnel etching of aluminium

Anodic dissolution of Al 99.99% in hot chloride solutions produces a high density of fine etch tunnels that extend along (100) directions. Tunnels evolve from cubic etch pits when all but one of the pit wall surfaces become passivated; dissolution then occurs at the one active face at a rate that ma...

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Bibliographic Details
Published inJournal of the Electrochemical Society Vol. 131; no. 1; pp. 13 - 17
Main Authors ALWITT, R. S, UCHI, H, BECK, T. R, ALKIRE, R. C
Format Journal Article
LanguageEnglish
Published Pennington, NJ Electrochemical Society 1984
Subjects
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
Hydrochloric acid
Acid corrosion
Crystal orientation
Electron microscopy
Dissolution
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Summary:Anodic dissolution of Al 99.99% in hot chloride solutions produces a high density of fine etch tunnels that extend along (100) directions. Tunnels evolve from cubic etch pits when all but one of the pit wall surfaces become passivated; dissolution then occurs at the one active face at a rate that may initially be as high as 20 A/cm exp 2 . Tunnels have square cross-sections with sides approx 1 mu m and the aspect ratios as high as 100:1. Tunnel growth may be considered a unique form of pitting corrosion in which dissolution and passivation occur simultaneously with a sustained balance between the two processes. 13 ref.--AA
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2115495