Evaluation of cerium oxide coated Cu cermets as inert anodes for aluminum electrowinning

Technical Report · Sat Aug 01 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/7228975· OSTI ID:7228975

Cu/NiFe{sub 2}O{sub 4} cermets were evaluated, with and without an in-situ deposited CEROX (TM; cerium oxide) coating, in 100 h laboratory A1 electrowinning tests. Bath ratio and current density were varied between tests and corrosion was determined by contamination of the aluminum and cryolite by cermet components (Cu, Fe, and Ni). Higher bath ratios of 1.5 to 1.6 led to less corrosion and thicker CEROX coatings. Lower current densities led to slightly less corrosion but much less oxidation of the Cu cermet substrate. At identical test conditions, the corrosion of the CEROX coated cermets was 1/7 that of an uncoated cermet. Corrosion was increased in CEROX coated cermets tested under unsaturated alumina conditions. The electrical conductivity of the CEROX coating was measured to be {approximately}0.2 ohm{sup {minus}1}cm{sup {minus}1}, resulting in a slight voltage penalty, depending on the thickness of the coating.

• Research Organization: ELTECH Research Corp., Fairport Harbor, OH (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FC07-90ID12949
• OSTI ID: 7228975
• Report Number(s): DOE/ID/12949-T1; ON: DE92019333
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALLOYS
ALUMINIUM
ANODES
CERIUM COMPOUNDS
CERIUM OXIDES
CERMETS
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
COMPOSITE MATERIALS
COPPER ALLOYS
CORROSION
CURRENT DENSITY
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODES
ELECTROMETALLURGY
ELEMENTS
FERRIMAGNETIC MATERIALS
FERRITES
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
METALLURGY
METALS
NICKEL COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PROGRESS REPORT
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS