Potential-determining reactions during pitting corrosion of aluminum

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6859131

Isaacs, H S; Ishikawa, Y

Scanning measurements of the potential field over surfaces of aluminum, pitting in dilute chlorine solution, has shown that anodic currents are observed over pits and the cathodic reactions within the pits do not contribute significantly to the dissolution rates. The role of nitrate ions, added during pitting, led to increased potentials by reducing the dissolution rates within the pits, rather than increasing cathodic rates within or external to the pit. Potential decreases after a long period of exposure resulted from increased anodic rates rather than inhibited cathodic sites.

• Research Organization: Brookhaven National Lab., Upton, NY (USA); Hitachi Ltd., Tsuchiura (Japan). Mechanical Engineering Research Lab.
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6859131
• Report Number(s): BNL-34342; ON: DE84007695
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALUMINIUM
CHEMICAL REACTIONS
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CURRENT DENSITY
DISSOLUTION
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
METALS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PITTING CORROSION