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Corrosion Rate of Unalloyed Steels and Cast Irons in Reducing Granitic Groundwaters and Chloride Solutions

Published online by Cambridge University Press:  28 February 2011

J. P. Simpson ,
R. Schenk  and
B. Knecht
J. P. Simpson
Affiliation:
Sulzer Bros Ltd., Winterthur, Switzerland
R. Schenk
Affiliation:
Sulzer Bros Ltd., Winterthur, Switzerland
B. Knecht
Affiliation:
National Cooperative for the Storage of Radioactive Waste (NAGRA), Baden, Switzerland
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Abstract

Measurements of the corrosion rate of unalloyed steel have been made under conditions representative for repositories in the granitic bedrock of Northern Switzerland using two independent methods: (1) Immersion tests in two representative groundwaters, with and without bentonite; (2) Hydrogen evolution measurements in these groundwaters. The immersion tests were carried out at 80°C and 140°C. In both cases the corrosion rate was higher than 50 μm/a as determined at the end of the first observation period of about 500 h. Corrosion rates of under 10 μm/a were estimated after the first 500 h. The corrosion rates were similar in both groundwaters with mineralisations of approx. 3 g/11 and 14 g/11 respectively, and were generally higher at 80°C than at 140°C. The hydrogen evolution measurements allow an hourly determination of the corrosion rate, with a sensitivity expressed as a corrosion rate of better than 0.1 μm/a. The results generally confirm the observation made in the immersion testing; high corrosion rates were observed over the first few days but then decreased to values well below 10 μm/a. The steady state corrosion rates measured were 1.1 μm/a, 6.5 μm/a, and 2.5 μm/a at 25°C, 50°C, and 80°C respectively in the water with the higher mineralisation. The inverse temperature effect on corrosion rate above 50°C is attributed to a change in the nature of the passive film at higher temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 429
Copyright
Copyright © Materials Research Society 1985

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References

List of References

1. Gewähr, Nagra Report NGB 85−04, Baden, Switzerland, 1985 Google Scholar
2. Simpson, J.P., Nagra Technical Report Series NTB 83−05, Baden, Switzerland, 1983 Google Scholar
3. Simpson, J. P., Nagra Technical Report Series NTB 84−01, Nagra, Switzerland, 1984 Google Scholar
4. Grauer, R., Nagra Technical Report Series NTB 84−19, Baden, Switzerland, 1984 Google Scholar
5. Nagra Technical Report Series NTB 84−32, Baden, Switzerland, 1984 Google Scholar
6. Swiss standard VSM 10697. Verband Schweizerischer Maschinen-industrieller, 1976 Google Scholar
7. DIN Standard 1693. Deutsches Institut für Normung, 1973 Google Scholar
8. Müller-von, Moos M., Kahr, G., Nagra Technical Report Series NTB 83−12, Baden, Switzerland, 1983 Google Scholar
9. Schenk, R., Nagra Technical Report Series NTB 83−16, Baden, Switzerland, 1983 Google Scholar
10. Marsh, G. P., Bland, I. W., Desport, J. A., Naish, C., Westcott, C., Taylor, K. J., European Appl. Res. Rept.-Nucl. Sci. Technol. 5 (2), 223–252, 1983 Google Scholar
11. STEAG Kernenergie GmbH, Motor-Columbus Ingenieurunternehmung AG, Nagra Technical Report Series NTB 84−31, Baden, Switzerland, 1984 Google Scholar
12. Wick, W.: Final storage container designs for highly radioactive waste. Poster paper presented at this conference and to be published.Google Scholar