Initiation of crevice corrosion

Journal Article · Mon Mar 01 00:00:00 EST 1982 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2123884· OSTI ID:6600587

Siitari, D W; Alkire, R C

The mechanism of passivity breakdown within crevices was investigated for aluminum in 0.05M NaCl and for iron in dilute mixtures of NaCl, Na/sub 2/SO/sub 4/, and NaNO/sub 2/. The pH, electrode potential, and current distribution were monitored continuously in segmented crevices which simulated realistic corrosion conditions. Variation in the crevice geometry was found to have a significant effect on the current distribution behavior during initiation of crevice corrosion. Breakdown of passivity on aluminum typically took place within a matter of hours and was accompanied by hydrogen bubble evolution within the crevice at a pH near 4.1. The behavior for iron was qualitatively different than that for aluminum, indicating that the mechanism of passivity breakdown is different for the two metals. 39 refs.

• Research Organization: Univ of Ill, Urbana, USA
• OSTI ID: 6600587
• Journal Information: J. Electrochem. Soc.; (United States), Vol. 129:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
CREVICE CORROSION
IRON
ELECTRIC CURRENTS
ELECTRODES
NITRITES
PH VALUE
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM SULFATES
ALKALI METAL COMPOUNDS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CURRENTS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
METALS
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion