Corrosion of cermet anodes during low temperature electrolysis of alumina. Final report

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Description

Successful development of inert anodes to replace carbon anodes in Hall cells has the potential benefits of lower energy consumption,lower operating costs, and reduced CO{sub 2} and CO emissions. Using inert anodes at reduced current density and reduced operating temperature (800 C) has potential for decreasing the corrosion rate of inert anodes. It may also permit the use of new materials for containment and insulation. This report describes the fabrication characteristics and the corrosion performance of 5324-17% Cu Cermet anodes in 100 hour tests. Although some good results were achieved, the corrosion rate at low temperature (800 C) is varied ... continued below

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84 p.

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Kozarek, R.L.; Ray, S.P.; Dawless, R.K. & LaCamera, A.F. September 26, 1997.

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Description

Successful development of inert anodes to replace carbon anodes in Hall cells has the potential benefits of lower energy consumption,lower operating costs, and reduced CO{sub 2} and CO emissions. Using inert anodes at reduced current density and reduced operating temperature (800 C) has potential for decreasing the corrosion rate of inert anodes. It may also permit the use of new materials for containment and insulation. This report describes the fabrication characteristics and the corrosion performance of 5324-17% Cu Cermet anodes in 100 hour tests. Although some good results were achieved, the corrosion rate at low temperature (800 C) is varied and not significantly lower than typical results at high temperature ({approximately} 960 C). This report also describes several attempts at 200 hour tests, with one anode achieving 177 hours of continuous operation and another achieving a total of 235 hours but requiring three separate tests of the same anode. The longest run did show a lower wear rate in the last test; but a high resistance layer developed on the anode surface and forced an unacceptably low current density. It is recommended that intermediate temperatures be explored as a more optimal environment for inert anodes. Other electrolyte chemistries and anode compositions (especially high conductivity anodes) should be considered to alleviate problems associated with lower temperature operation.

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84 p.

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OSTI as DE98004039

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  • Other Information: PBD: 26 Sep 1997

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  • Other: DE98004039
  • Report No.: DOE/ID/12848--T1
  • Grant Number: FC07-89ID12848
  • DOI: 10.2172/296819 | External Link
  • Office of Scientific & Technical Information Report Number: 296819
  • Archival Resource Key: ark:/67531/metadc685449

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 26, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 15, 2015, 5:02 p.m.

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Kozarek, R.L.; Ray, S.P.; Dawless, R.K. & LaCamera, A.F. Corrosion of cermet anodes during low temperature electrolysis of alumina. Final report, report, September 26, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc685449/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.