Detection of localized and general corrosion of mild steel in simulated defense nuclear waste solutions using electrochemical noise analysis

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Description

Underground waste tanks fabricated from mild steel store more than 60 million gallons of radioactive waste from 50 years of weapons production. Leaks are suspected in a significant number of tanks. The probable modes of corrosion failures are reported to be localized corrosion (e.g. nitrate stress corrosion cracking and pitting). The use of electrochemical noise (EN) for the monitoring and detection of localized corrosion processes has received considerable attention and application over the last several years. Proof of principle laboratory tests were conducted to verify the capability of EN evaluation to detect localized corrosion and to compare the predictions of ... continued below

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40 p.

Creation Information

Edgemon, G.L.; Ohl, P.C.; Bell, G.E.C. & Wilson, D.F. December 1, 1995.

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  • Westinghouse Hanford Company
    Publisher Info: Westinghouse Hanford Co., Richland, WA (United States)
    Place of Publication: Richland, Washington

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Description

Underground waste tanks fabricated from mild steel store more than 60 million gallons of radioactive waste from 50 years of weapons production. Leaks are suspected in a significant number of tanks. The probable modes of corrosion failures are reported to be localized corrosion (e.g. nitrate stress corrosion cracking and pitting). The use of electrochemical noise (EN) for the monitoring and detection of localized corrosion processes has received considerable attention and application over the last several years. Proof of principle laboratory tests were conducted to verify the capability of EN evaluation to detect localized corrosion and to compare the predictions of general corrosion obtained from EN with those derived from other sources. Simple, pre-fabricated flat and U-bend specimens of steel alloys A516-Grade 60 (UNS K02100) and A537-CL 1 (UNS K02400) were immersed in temperature controlled simulated waste solutions. The simulated waste solution was either 5M NaNO{sub 3} with 0.3M NaOH at 90 C or 11M NaNO{sub 3} with 0.15M NaOH at 95 C. The electrochemical noise activity from the specimens was monitored and recorded for periods ranging between 140 and 240 hours. At the end of each test period, the specimens were metallographically examined to correlated EN data with corrosion damage.

Physical Description

40 p.

Notes

INIS; OSTI as DE96005200

Source

  • National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996

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  • Other: DE96005200
  • Report No.: WHC-SA--3016
  • Report No.: CONF-960389--2
  • Grant Number: AC06-87RL10930
  • DOI: 10.2172/195644 | External Link
  • Office of Scientific & Technical Information Report Number: 195644
  • Archival Resource Key: ark:/67531/metadc665975

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

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  • December 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 8, 2016, 8:30 p.m.

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Edgemon, G.L.; Ohl, P.C.; Bell, G.E.C. & Wilson, D.F. Detection of localized and general corrosion of mild steel in simulated defense nuclear waste solutions using electrochemical noise analysis, report, December 1, 1995; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc665975/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.