Small and medium reactors using lead alloys as coolants are one of the promising reactor concepts with improved safety because of their thermal-physical and chemical properties. This paper focuses on the development of Al-alloy coating for nuclear systems using liquid lead-bismuth eutectic (LBE). Since corrosion attack becomes severe against structural steels at high temperatures in liquid LBE, it is necessary to improve the corrosion resistance of steels. An Al-alloy coating method using Al, Ti, and Fe powders, and laser beam heating has been developed. The main defects formed in the Al-powder-alloy coating process are surface defects and cracks. The conditions required to avoid these defects are the employment of the laser beam scanning rate of 20 mm/min and the adjustment of the Al concentration in the coating layer. According to the results of the corrosion tests at 550 °C in liquid LBE, the Al-alloy coating layers on 316SS prevent severe corrosion attack such as grain boundary corrosion and LBE penetration observed in the 316SS without coating. The good corrosion resistance of the Al-alloy coating is based on the thin Al-oxide film, which can be regenerated in liquid LBE. From the viewpoint of the soundness of the produced Al-powder-alloy coating layers and the preservation of their corrosion resistance, it is estimated that the range of adequate Al concentration in the coating layer is from 4 to 12 wt. %.

References

References
1.
Sugawara
,
T.
,
Nishihara
,
K.
,
Tsujimoto
,
K.
,
Iwanaga
,
K.
,
Kurata
,
Y.
,
Sasa
,
T.
, and
Oigawa
,
H.
, 2007, ”
Feasibility Study of Accelerator Driven System Proposed by JAEA
,”
Proceedings of Global 2007
,
Boise, Idaho, USA
, pp.
998
1007
.
2.
Gorynin
,
I. V.
,
Karzov
,
G. P.
,
Markov
,
V. G.
,
Lavrukhin
,
V. S.
, and
Yakovlev
,
V. A.
, 1999, “
Structural Materials for Power Plants with Heavy Liquid Metals as Coolants
,”
Proceedings of Heavy Liquid Metal Coolants in Nuclear Technology
,
HLMC’98
,
Obninsk, Russia
, pp.
120
132
.
3.
Kurata
,
Y.
,
Futakawa
,
M.
, and
Saito
,
S.
, 2008, “
Corrosion Behavior of Steels in Liquid Lead-Bismuth with Low Oxygen Concentrations
,”
J. Nucl. Mater.
,
373
, pp.
164
178
.
4.
Yachmenyov
,
G. S.
,
Rusanov
,
A. Ye.
,
Gromov
,
B. F.
,
Belomytsev
,
Yu S.
,
,
Skvortsov
,
N. S.
, and
Demishonkov
,
A. P.
, 1999, “
Problems of Structural Materials’ Corrosion in Lead-Bismuth Coolant
,”
Proceedings of Heavy Liquid Metal Coolants in Nuclear Technology
,
HLMC’98
,
Obninsk, Russia
, pp.
133
140
.
5.
Takaya
,
S.
,
Furukawa
,
T.
,
Aoto
,
K.
,
Mueller
,
G.
,
Weisenburger
,
A.
,
Heinzel
,
A.
,
Inoue
,
M.
,
Okuda
,
T.
,
Abe
,
F.
,
Ohnuki
,
S.
,
Fujisawa
,
T.
, and
Kimura
,
A.
, 2009, “
Corrosion Behavior of Al-Alloying High Cr-ODS Steels in Lead-bismuth Eutectic
,”
J. Nucl. Mater.
,
386–388
, pp.
507
510
.
6.
Takaya
,
S.
,
Furukawa
,
T.
,
Inoue
,
M.
,
Fujisawa
,
T.
,
Okuda
,
T.
,
Abe
,
F.
,
Ohnuki
,
S.
, and
Kimura
,
A.
, 2010, “
Corrosion Resistance of Al-Alloying High Cr-ODS Steels in Stagnant Lead-bismuth
,”
J. Nucl. Mater.
,
398
, pp.
132
138
.
7.
Kasada
,
R.
,
Toda
,
N.
,
Yutani
,
K.
,
Cho
,
H. S.
,
Kishimoto
,
H.
, and
Kimura
,
A.
, 2007, “
Pre-and Post-Deformation Microstructures of Oxide Dispersion Strengthened Ferritic Steels
,”
J. Nucl. Mater.
,
367-370
, pp.
222
228
.
8.
Porollo
,
S. I.
,
Dvoriashin
,
A. M.
,
Konobeev
,
Yu V.
,
, and
Garner
,
F. A.
, 2004, “
Microstructure and Mechanical Properties of Ferritic/Martensitic Steel EP823 After Neutron Irradiation to High Doses in BOR-60
,”
J. Nucl. Mater.
,
329-333
, pp.
314
318
.
9.
Mueller
,
G.
,
Heinzel
,
A.
,
Konys
,
J.
,
Schumacher
,
G.
,
Weisenburger
,
A.
,
Zimmermann
,
F.
,
Engelko
,
V.
,
Rusanov
,
A.
, and
Markov
,
V.
, 2002, “
Results of Steel Corrosion Tests in Flowing Liquid Pb/Bi at 420 - 600 °C after 2000 h
,”
J. Nucl. Mater.
,
301
, pp.
40
46
.
10.
Mueller
,
G.
,
Schumacher
,
G.
,
Weisenburger
,
A.
,
Heinzel
,
A.
,
Zimmermann
,
F.
,
Furukawa
,
T.
, and
Aoto
,
K.
, 2003, “
Study on Pb-Bi Corrosion of Structural and Fuel Cladding Materials for Nuclear Applications: Part III
,” JNC Report No. TY9400 2003-026.
11.
Weisenburger
,
A.
,
Heinzel
,
A.
,
Mueller
,
G.
,
Muscher
,
H.
, and
Rusanov
,
A.
, 2008, “
T91 Cladding Tubes with and without Modified FeCrAlY Coatings Exposed in LBE at Different Flow, Stress and Temperature Conditions
,”
J. Nucl. Mater.
,
376
, pp.
274
281
.
12.
Deloffre
,
Ph.
,
Balbaud-Celerier
,
F.
, and
Terlain
,
A.
, 2004, “
Corrosion Behaviour of Aluminized Martensitic and Austenitic Steels in Liquid Pb-Bi
,”
J. Nucl. Mater.
,
335
, pp.
180
184
.
13.
Kurata
,
Y.
and
Futakawa
,
M.
, 2004, “
Corrosion Behavior of Al-Surface-Treated Steels in Liquid Pb-Bi in a Pot
,”
J. Nucl. Mater.
,
325
, pp.
217
222
.
14.
Kurata
,
Y.
,
Sato
,
H.
,
Yokota
,
H.
, and
Suzuki
,
T.
, 2011, “
Applicability of Al-Powder-Alloy Coating to Corrosion Barriers of 316SS in Liquid Lead-Bismuth Eutectic
,”
Mater. Trans.
,
52
, pp.
1033
1040
.
15.
Kurata
,
Y.
,
Abe
,
Y.
,
Futakawa
,
M.
, and
Oigawa
,
H.
, 2010, “
Characterization and Re-Activation of Oxygen Sensors for Use in Liquid Lead-Bismuth
,”
J. Nucl. Mater.
,
398
, pp.
165
171
.
16.
Regina
,
J. R.
,
Dupont
,
J. N.
, and
Marder
,
A. R.
, 2007, “
The Effect of Chromium on the Weldability and Microstructure of Fe-Cr-Al Weld Cladding
,”
Weld. Res. (Miami, FL, U. S.)
,
86
, pp.
170s
-
178s
.
17.
Kurata
,
Y.
and
Saito
,
S.
, 2009, “
Temperature Dependence of Corrosion of Ferritic/Martensitic and Austenitic Steels in Liquid Lead-Bismuth Eutectic
,”
Mater. Trans.
,
50
, pp.
2410
2417
.
You do not currently have access to this content.