Scanning electrochemical microscopy of precursor sites for pitting corrosion on titanium

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2220897· OSTI ID:5631037

Casillas, N; Charlebois, S J; Smyrl, W H ^[1]; White, H S ^[2]

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1. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Chemical Engineering
2. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemistry

Scanning electrochemical microscopy, SECM, of oxide-covered titanium foils ([approximately]50 [angstrom] oxide thickness) immersed in potassium bromide solutions is reported. Electrogeneration of bromine (2 Br[sup [minus]] [r arrow] Br[sub 2] + 2e[sup [minus]]) at the TiO[sub 2] film is shown to occur rapidly at a few microscopic surface sites. The regions of intense faradaic activity observed in SECM images correlate directly with the location of pit nucleation. The direct correspondence between sites of faradaic activity and oxide breakdown provides a means of identifying precursor sites for pit information.

• OSTI ID: 5631037
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:9; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE
BROMINE COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
CORROSIVE EFFECTS
ELECTROCHEMICAL CELLS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HALOGENS
METALS
MICROSCOPY
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PITTING CORROSION
POTASSIUM BROMIDES
POTASSIUM COMPOUNDS
PRECURSOR
TITANIUM
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS