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RESEARCH PAPERS

Anodic Behavior of Specimens Prepared From a Full-Diameter Alloy 22 Fabricated Mockup Container for Nuclear Waste

[+] Author and Article Information
John C. Estill, Raul B. Rebak

 Lawrence Livermore National Laboratory, 7000 East Avenue, L-631 Livermore, CA 94550

J. Pressure Vessel Technol 129(4), 729-736 (Jun 01, 2006) (8 pages) doi:10.1115/1.2767366 History: Received February 02, 2006; Revised June 01, 2006

Alloy 22 (N06022) has been extensively tested for general and localized corrosion behavior both in the wrought annealed condition and in the as-welded condition. In general, the specimens for laboratory testing are mostly prepared from flat plates of material. It is important to determine if the process of fabricating a container will affect the corrosion performance of this alloy. Thus, specimens for corrosion testing were prepared directly from a fabricated full-diameter Alloy 22 container. Results show that both the anodic corrosion behavior and the localized corrosion resistance of specimens prepared from a welded container were the same as those from flat welded plates.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

24hEcorr of Alloy 22 mockup specimens in NaCl and CaCl2 containing electrolytes

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Figure 3

24hEcorr of Alloy 22 mockup specimens in NaCl+KNO3 electrolytes at 80 and 100°C

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Figure 4

Ecorr as a function of immersion time for Alloy 22 mockup specimens in NaCl and CaCl2 containing electrolytes

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Figure 5

CR of Alloy 22 mockup specimens in NaCl and CaCl2 containing electrolytes

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Figure 6

CR of Alloy 22 mockup specimens in NaCl+KNO3 electrolytes at 80 and 100°C

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Figure 1

Typical CPP of Alloy 22 in 5MCaCl2 at 90°C, showing breakdown and repassivation potentials

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Figure 9

Cyclic polarization of Alloy 22 mockup and archive specimens in 12mCaCl2+6mCa(NO3)2 at 130°C

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Figure 10

Alloy 22 specimen AY008 after CPP testing in 5MCaCl2 at 90°C, showing typical massive localized attack, magnification ∼×8

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Figure 12

Alloy 22 specimen AY011 after CPP in 12mCaCl2+6mCa(NO3)2 at 130°C, showing localized attack outside crevice formers, magnification ∼×8

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Figure 13

Alloy 22 specimen AY011 after CPP in 12mCaCl2+6mCa(NO3)2 at 130°C, showing localized attack on the short transverse noncreviced face, magnification ∼×8

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Figure 15

Alloy 22 specimen AY003 after CPP in 6mNaCl+0.9mKNO3 at 80°C, showing light transpassivity in the bold (noncreviced) areas and little dull type II crevice corrosion under the crevice formers, magnification ∼×8

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Figure 16

Alloy 22 specimen AY005 after CPP in 6mNaCl+0.9mKNO3 at 100°C showing transpassivity in the bold noncreviced areas and mostly dull type II crevice corrosion under the crevice formers, magnification ∼×8

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Figure 17

Comparison of the repassivation potential of Alloy 22 between mockup and archive specimens. The repassivation potential was always higher for the mockup specimens. The error bars represent the standard deviation.

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Figure 7

Cyclic polarization of Alloy 22 mockup and archive specimens in 1M NaCl at 90°C

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Figure 8

Cyclic polarization of Alloy 22 mockup and archive specimens in 5MCaCl2 at 90°C

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Figure 11

Alloy 22 specimen AY008 after CPP testing in 5MCaCl2 at 90°C, showing typical massive localized attack starting from pits on the short transversal, noncreviced face, magnification ∼×8

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Figure 14

Alloy 22 specimen AY009 after CPP in 1M NaCl at 90°C, showing transpassivity in the bold noncreviced areas and type I crevice corrosion under the crevice formers, magnification ∼×8

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