STUDIES ON THE CONTROL OF METAL PASSIVATION IN THE ELECTROCHEMICAL TUNNEL ETCHING OF ALUMINUM.

Kurt Hebert, Richard C Alkire

Research output: Contribution to journalArticlepeer-review

Abstract

Anodic etching of aluminum in chloride solutions at temperatures above 60 degree C yields square, micron-wide corrosion tunnels which penetrate the metal by crystallographic etching. The object of this study was the elucidation of the mechanism by which passivation at the tips of etch tunnels is controlled. In the hypothesized mechanism, electrolyte diffusion in the tunnels maintains the tips of all tunnels at the equilibrium potential of an electro-sorption reaction involving chloride ions; this equilibrium potential was considered to be identical to the empirical pitting potential.

Original languageEnglish (US)
Pages (from-to)226
Number of pages1
JournalElectrochemical Society Extended Abstracts
Volume85-2
StatePublished - 1985

ASJC Scopus subject areas

  • Engineering(all)

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