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TitleCorrosion Evaluation of Metallic Materials for Long-Lived HLW/Spent Fuel Disposal Containers
LanguageEnglish
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FORSCHUNGSZENTRUM KARLSRUHE
Technik und Umwelt

Wissenschaftliche Berichte
FZKA 6285

Corrosion Evaluation of Metallic Materials for
Long-Lived HLW/Spent Fuel Disposal Containers

Final Report 1996-1998

E. Smailos, A. Martínez-Esparza 1),
B. Kursten 2), G. Marx 3), I. Azkarate 4)

Institut für Nukleare Entsorgungstechnik

1) ENRESA, Madrid (E), 2) SCK.CEN, Mol (B),
3) FU Berlin (D), 4) INASMET, San Sebastian (E)

EC-Contract No. FI4W-CT95-0002

Forschungszentrum Karlsruhe GmbH, Karlsruhe
1999

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concentration of 5·10-2 mol/l was chosen in order to see differences between brine
with and without H2O2 . The results are listed up in Tables 4.9 and 4.10.

TABLE 4.9 Corrosion rates of Ti99.8-Pd at applied potentials
in brine 3 having an average H2O2 concentration
of 5·10-2 mol/l

Potential
mV

Corrosion rates
(25°C)
µm/a

-1000
-500
-400
-350
-300
-250
-200
-150
-100

0
+500

+1000

2 ± 1
1 ± 1
2 ± 1
2 ± 1
1 ± 1
1 ± 1
1 ± 2
6 ± 2
2 ± 1
6 ± 3
2 ± 2
2 ± 2

TABLE 4.10 Corrosion rates of Ti99.8-Pd at applied potentials
in Q-brine having an average H2O2 concentration
of 5·10-2 mol/l

Potential
mV

Corrosion rates
(25°C)
µm/a

-1000
-500
-400
-350
-300
-250
-200
-150
-100

0
+500

+1000

2 ± 1
1 ± 1
2 ± 2
1 ± 1
2 ± 1
2 ± 1
2 ± 2
2 ± 1
1 ± 1
2 ± 1
2 ± 1
1 ± 1

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- 29 -

Neither in brine 3 (Table 4.9) nor in Q-brine (Table 4.10), a marked active range was
obtained. In brine 3 (5·10-2 mol/l H2O2), the maximum corrosion rate is 6 ± 3 µm/a,
which is only a factor 2-3 higher than in the peroxide free brine. In Q-brine containing
H2O2 ( 5·10

-2 mol/l), the corrosion rates are very close to those without any H2O2 (2 ±
1 µm/a). A significant dependence of the corrosion rate on the temperature was not
observed (see Tables 4.11 and 4.12).

TABLE 4.11 Corrosion rates of Ti99.8-Pd at –250 mV and +500 mV in brine 3
having various H2O2 concentrations

Potential
mV

Average H2O2
concentration

mol/l

Corrosion rates
(25°C)
µm/a

Corrosion rates
(55°C)
µm/a

Corrosion rates
(80°C)
µm/a

-250 5·10-5

5·10-4

2.5·10-3

5·10-3

2.5·10-2

5·10-2

0.4 ± 0.3
0.3 ± 0.3

1 ± 1
10 ± 5

146 ± 50
791 ± 50

1.1 ± 1
0.1 ± 0.2

0.2 ± 0.2

0.3 ± 0.2

1 ± 1
0.4 ± 0.4

0.5 ± 0.5
1.5 ± 1.5
2.5 ± 2

+500 5·10-5

5·10-4

5·10-3

5·10-3

5·10-2

5·10-2

2.3 ± 2
1.6 ± 1.5

1 ± 1
1.2 ± 1

0.1 ± 0.1
3 ± 3

0.1 ± 0.2
1.3 ± 1

0.7 ± 0.6

0.5 ± 0.5

1 ± 1
0.5 ± 0.5

1 ± 2

0.5 ± 1

TABLE 4.12 Corrosion rates of Ti99.8-Pd at –250 mV and +500 mV in Q-brine
having various H2O2 concentrations

Potential
mV

Average H2O2
concentration

mol/l

Corrosion rates
(25°C)
µm/a

Corrosion rates
(55°C)
µm/a

Corrosion rates
(80°C)
µm/a

-250 5·10-5

5·10-4

2.5·10-3

5·10-3

2.5·10-2

5·10-2

1.7 ± 1.5
2.5 ± 2.5
1.5 ± 2
0.1 ± 1
0.6 ± 1
2.5 ± 2

1 ± 1
1 ± 1

0.5 ± 1

0.2 ± 1

1 ± 1
1.5 ± 2

2 ± 2

0.1 ± 1
+500 5·10-5

5·10-4

5·10-3

5·10-3

5·10-2

5·10-2

1 ± 1
1.3 ± 1.3
8.4 ± 8
2 ± 2

10 ± 2
14 ± 2

0.3 ± 1
2 ± 2

1.2 ± 2

1.2 ± 2

1 ± 2
1 ± 1

1.5 ± 2

3.3 ± 3

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