The effects of microstructure on the corrosion of glycine/nitrate processed cermet inert anodes: A preliminary study

Technical Report · Mon Jul 01 04:00:00 EDT 1991

DOI:https://doi.org/10.2172/5419847· OSTI ID:5419847

Chick, L A; Maupin, G D; Stice, N D

The Inert Electrodes Program at the Pacific Northwest Laboratory (PNL) is supported by the Office of Industrial Processes of the US Department of Energy and is aimed at improving the energy efficiency of Hall-Heroult cells through the development of inert anodes. The inert anodes currently under the study are composed of a cermet material of the general composition NiO-NiFe{sub 2}O{sub 4}-Cu. The program has three primary objectives: (a) to evaluate the anode material in a scaled-up, pilot cell facility, (b) to investigate the mechanisms of the electrochemical reactions at the anodes surface, and (c) to develop sensors for monitoring various anode and/or electrolyte conditions. This report covers the results of a portion of the studies on anode reaction mechanisms. The anode mechanism studies were focused in four areas in FY 1990 and FY 1991: (a) the determination of whether a film formed on cermet inert anodes and (if it existed) the characterization of this film, (b) the determination of the sources of the anode impedance, (c) the evaluation of the effects of silica and a precorroded state on anode corrosion, and (d) a preliminary study on the effect of microstructure on the corrosion properties of the anodes. This report discusses the results of the microstructure studies. 6 refs., 32 figs., 3 tabs.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5419847
• Report Number(s): PNL-7733; ON: DE91017628
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
AMINO ACIDS
ANODES
CARBOXYLIC ACIDS
CERMETS
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPOSITE MATERIALS
CORROSION
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRODES
FABRICATION
GLYCINE
MATERIALS
MATERIALS WORKING
MICROSTRUCTURE
NITRATES
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE SIZE
POROSITY
PRESSING
SCATTERING
SINTERING
SIZE
X-RAY DIFFRACTION