CORROSION OF STAINLESS STEEL IN ACIDIC NITRATE WASTE SOLUTIONS FROM PROCESSING STAINLESS STEEL REACTOR FUELS

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The influence of the surface state on steel corrosion in high temperature steam and water is studied. The autoclave tests were continued for stainless steel grade 304 and undertaken for Creusot 1.2 MD07 boilerplate steel. Regarding the stainless steel, complete results for the tests in water at 300 deg C and partial results for the tests in steam at 400 deg C--200 kg/cm/sup 2/ are presented. The evaluation of the corrosion by ponderal variations involves the reduction of the adhering oxides by hydrogen at 800 deg C. Tests in water at 300 deg C reveal the favorable character of the ... continued below

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Pages: 31

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Hess, D.N.; Rice, L.; Willis, B.; Snavely, E.S. & Clark, W.E. October 16, 1963.

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Description

The influence of the surface state on steel corrosion in high temperature steam and water is studied. The autoclave tests were continued for stainless steel grade 304 and undertaken for Creusot 1.2 MD07 boilerplate steel. Regarding the stainless steel, complete results for the tests in water at 300 deg C and partial results for the tests in steam at 400 deg C--200 kg/cm/sup 2/ are presented. The evaluation of the corrosion by ponderal variations involves the reduction of the adhering oxides by hydrogen at 800 deg C. Tests in water at 300 deg C reveal the favorable character of the Jacquet bath electrolytically polished state. Corrosion is lowered by a factor of about 3 compared with the rough or fine machined or mechanically polished with 600 paper under water states. The advantages that are acquired by the electrolytically polished state cannot be appraised by autoclave tests, as the corrosion rate tends to cancel itseif out after a period of time which depends on the surface state. It was revealed that 8 weeks was suitable for classifying the various surface states. In steam at 400 deg C--200 kg/cm/sup 2/, it is observed that the electrolytically polished state is a disadvantage. The latter conclusion does not appear after 2 weeks, the largest amount of corrosion with the electrolytically polished state is shown after 6 weeks. Both in water at 300 deg C and steam at 400 deg C-200 kg/cm/sup 2/ , the behavior of the AISI 304 stainless steel samples in the milled, ground, and mechanically polished with 600 paper states is observed as being very similar. The microscopic examinations on cross-sections of oxidized samples confirm the conclusions which were given on the basis of the ponderal variations. The perfecting of the apparatus necessary for determining the amount of corrosion by measuring the diffused hydrogen is finished. A model of the capsules suitable for the needs of the study was made. A test has enabled the operational conditions to be verified and has made it possible to determine the hydrogen concentrations likely to be encountered in argon. Preparation of a corrosion loop for dynamic tests is being continued. (auth)

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Pages: 31

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: ORNL-3474
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4625235 | External Link
  • Office of Scientific & Technical Information Report Number: 4625235
  • Archival Resource Key: ark:/67531/metadc1030413

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Office of Scientific & Technical Information Technical Reports

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  • October 16, 1963

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Oct. 23, 2017, 12:25 p.m.

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Hess, D.N.; Rice, L.; Willis, B.; Snavely, E.S. & Clark, W.E. CORROSION OF STAINLESS STEEL IN ACIDIC NITRATE WASTE SOLUTIONS FROM PROCESSING STAINLESS STEEL REACTOR FUELS, report, October 16, 1963; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc1030413/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.