Scanning electrochemical microscopy of precursor sites for pitting corrosion on titanium

Journal Article · Wed Sep 01 00:00:00 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), Vol. 140:9; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

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