Film Breakdown and Pitting
Final rept. 1 Sep 1971-31 Dec 1974
ILLINOIS UNIV AT URBANA DEPT OF METALLURGY AND MINING ENGINEERING
Pagination or Media Count:
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.
- Properties of Metals and Alloys