Film Breakdown and Pitting
Abstract
Aluminum was studied in sulfuric acid, with chloride to 0.1M, by electron microscopy, polarization and gravimetric methods. Film breakdown and transient pitting occurred in the absence of chloride. Chloride was not found to alter the film; its role was to stabilize pit embryo growth. Stable pit nucleation was conceived as requiring a pit embryo persistent enough to produce sufficient chloride enrichment within the pit. The observed absence of a sharp potential threshold for pit nucleation at low chloride levels was consistent with these views.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 21, 1975
- Accession Number
- ADA009788
Entities
People
- M. Metzger
Organizations
- University of Illinois Urbana–Champaign