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Principles of the Selection of Effective and Economic Corrosion-Resistant Alloys in Contact with Biologically Active Environments

Published online by Cambridge University Press:  01 January 1992

Nicholas J.E. Dowling ,
Carl Lundin ,
Dan Sachs ,
Jan A. Bullen  and
David C. White
Nicholas J.E. Dowling
Affiliation:
IRSID/Unieux Research Center, Firminy, BP 50, 42702 Firminy, France
Carl Lundin
Affiliation:
University of Tennessee, Materials Department, Knoxville, TN 37996
Dan Sachs
Affiliation:
Arizona Public Service Company, PO Box 52034, Mail Sta.6086, Phoenix, AZ 85072-2034
Jan A. Bullen
Affiliation:
Center for Environmental Biotechnology, 10515 Research Dr., Knoxville, TN 37932
David C. White
Affiliation:
Center for Environmental Biotechnology, 10515 Research Dr., Knoxville, TN 37932
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Abstract

Current field experience with microbiological influenced corrosion (MIC) has now extended into the medium-grade stainless steels containing 4% molybdenum and in excess of 20% chromium. These may indeed be special cases where a combination of synergistic effects, temperature, and wet-dry cycles have aggravated a situation that is already subject to a mild form of MIC. Data are presented from a fresh water field site, comparing the relative performance of several welded coupons, including AISI 304L, 316L, and higher alloyed grades, 622, C276, C-22, 25-6Mo exposed to principally iron-oxidizing bacteria. Specific data is also presented from a saltwater laboratory study of AISI 316/E308 welds where sulfate-reducing bacteria were included. Normally this weld configuration is considered “mismatched” however has nevertheless been employed at several inland power stations. Data is presented which suggests that under “freshwater” conditions (ie. < 150 ppm Cl−) excluding deposits originating from other sources, for example, calcareous scales, an increase in chromium content may significantly reduce the problem. The laboratory study showed that severe generalized rusting of 316/E308 welds may be expected in the presence of fermentative and sulfate-reducing bacteria in chloride environments. The relationship of these data, and of those available in the literature, to the problem of long-term radioactive waste disposal, is discussed with respect to materials selection.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 361
Copyright
Copyright © Materials Research Society 1993

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References

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